• 专利附录
  • 专利说明
  • 权利要求
  • 类似技术
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    • 专利摘要:
    high strength and ductility alpha / beta titanium alloy means an alpha / beta titanium alloy comprising as a percentage by weight based on the weight of the total alloy: 3.9 to 4.5 aluminum; 2.2 to 3.0 vanadium; 1.2 to 1.8 iron; 0.24 to 0.30 oxygen; up to 0.08 carbon; up to 0.05 nitrogen; up to 0.05 hydrogen; titanium; and up to a total of 0.30 of other elements. A non-limiting embodiment of the alpha / beta titanium alloy comprises an aluminum equivalent value of at least 6.4 to 7.2, exhibits a breaking strength of at least 120 ksi (827.4 mpa) at 155 ksi (1069 mpa), exhibits extreme tensile strength in the range of 130 ksi (896.3 mpa) to 165 ksi (1138 mpa), and has a ductility in the range of 12 to 30 percent elongation.
    公开号:BR112013005248B1
    申请号:R112013005248-1
    申请日:2011-09-07
    公开日:2019-10-01
    发明作者:David J. Bryan；John V. Mantione；Thomas D. Bayha
    申请人:Ati Properties Llc；
    IPC主号:
    专利说明:

    [001] This request is a continuation request in part claiming priority in accordance with USC 35 § 120 of copending application US 12 / 903.851, filed on October 13, 2010, and entitled “High Strength Alpha / Beta Titanium Alloy Fasteners and Fastener Stock ”, which is a continuation request in part claiming priority in accordance with USC 35 § 120 of copending US 12 / 888,699 patent application filed on September 23, 2010 and entitled“ High Strength Alpha / Beta Titanium Alloy Fasteners and Fastener Stock ”. The complete order descriptions with serial numbers 12 / 903.851 and 12 / 888.699 are hereby incorporated by reference.
    TECHNOLOGY FUNDAMENTALS
    TECHNOLOGY FIELD [002] The present disclosure refers to high strength and ductile titanium alpha / beta alloys.
    DESCRIPTION OF THE BASICS OF TECHNOLOGY [003] Titanium alloys typically have a high strength to weight ratio, are resistant to corrosion, and are resistant to deformation at moderately high temperatures. For these reasons, titanium alloys are used in the aerospace, aeronautics, defense, maritime and automotive applications, including, for example, landing gear members, engine frames, ballistic armor, hulls and mechanical fasteners.
    [004] Reducing the weight of an aircraft or other moving vehicle results in fuel savings. So, for example, there is a strong tendency in the aerospace industry to reduce the weight of the aircraft. Titanium and titanium alloys are attractive materials to achieve weight reduction in aircraft applications
    Petition 870190072454, of 7/29/2019, p. 17/41
    2/21 ves due to its high resistance to weight ratio. Most titanium alloy parts used in aerospace applications are made from Ti-6Al-4V alloy (ASTM Grade 5; UNS R56400; AMS 4928, AMS 4911), which is an alpha / beta titanium alloy.
    [005] The Ti-6Al-4V alloy is one of the most common manufactured materials based on titanium, estimated to account for more than 50% of the total market for materials based on titanium. The Ti-6Al-4V alloy is used in various applications that benefit from the advantageous combination of light weight, corrosion resistance and high resistance to low to moderate temperatures of the alloy. For example, Ti-6Al-4V alloy is used to produce components for aircraft engines, aircraft structural components, fasteners and high-performance automotive components, components for medical devices, sports equipment, components for marine applications and components for chemical processing equipment.
    [006] Ti-6Al-4V alloy laminated products are generally used either in a laminated annealed condition or in a treated and aged solution (STA) condition. As used herein, the “rolling annealing condition” refers to the condition of a titanium alloy after a “rolling annealing” heat treatment, in which a workpiece is annealed at an elevated temperature (eg 1200 -1500 ° F / 649-816 ° C) for about 1 to 8 hours and cooled in static air. A rolling annealing heat treatment is carried out after a workpiece is hot rolled in the field of the α + β phase. Ti6Al-4V round bar having a diameter of about 2 to 4 inches (5.08-10.16 cm) in a laminated annealed condition has a minimum specified extreme tensile strength of 130 ksi (896 MPa) and a minimum specified breaking strength of 120 ksi (827 MPa) at room temperature. Lamination annealed Ti-6Al-4V plate is often produced to the AMS 4911 specification, while the laminated annealed Ti-6Al-4V bar is often produced to the AMS 4928 specification.
    Petition 870190072454, of 7/29/2019, p. 18/41
    3/21 [007] US Patent 5,980,655 (“the '655 patent”), which is hereby incorporated by reference in its entirety, describes an alpha / beta titanium alloy comprising, in weight percentages, from 2.90 to 5.00 aluminum, from 2.00 to 3.00 vanadium, from 0.40 to 2.00 iron, from 0.20 to 0.30 oxygen, incidental impurities and titanium. The alpha / beta titanium alloys disclosed in the '655 patent are referred to here as "the' 655 alloys". A commercially available alloy composition within '655 alloys nominally includes, in weight percentages based on the total weight of the alloy, 4.00 aluminum, 2.50 vanadium, 1.50 iron, 0.25 oxygen, accidental impurities and titanium, and may be referred to herein as Ti-4Al2.5V-1.5Fe-0.25O alloy.
    [008] Due to the difficulty in cold working the Ti-6Al-4V alloy, the alloy is generally machined (for example, forged, laminated, drawn and the like) at elevated temperatures, in general, above the temperature of α2 solvus. The Ti-6Al-4V alloy cannot be effectively cold-worked to increase strength due, for example, to a high incidence of cracks (ie workpiece failure) during cold deformation. However, as described in US Patent Application Publication 2004/0221929, which is incorporated herein by reference in its entirety, it has surprisingly and unexpectedly been found that '655 alloys have a substantial degree of deformability / cold workability.
    [009] The '655 alloys surprisingly can be cold worked to achieve high strength, while maintaining a workable level of ductility. A workable level of ductility is defined here as a condition in which an alloy exhibits more than 6% elongation. In addition, the strength of the '655 alloys is comparable to that which can be achieved with the Ti-6Al-4V alloy. For example, as shown in Table 6 of the '655 patent, the tensile stress measured for a Ti-6Al-4V alloy is 145.3 ksi (1,002 MPa), while the tested samples of' 655 alloys showed resistance to traction in a range of 138.7 ksi to 142.7 ksi
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    4/21 (956.3 MPa to 983.9 MPa).
    [0010] Aerospace Material Specification 6946B (AMS 6946B) specifies a more limited range of chemistry than is recited in the '655 patent claims. The alloys specified in AMS 6946B retain the formability of the broader elementary range limits of the '655 patent, but the minimum mechanical strength properties allowed by the AMS 6946B are lower than those specified for the commercially available Ti-6Al-4V alloy . For example, according to AMS-4911L, the minimum tensile strength for 0.125 inch (3.175 mm) thick Ti-6Al-4V plate is 134 ksi (923.9 MPa) and the minimum tensile strength is 126 ksi (868.7 MPa). In comparison, according to AMS 6946B, the minimum tensile strength for the 0.125 inch (3.175 mm) thick Ti-4Al-2.5V-1.5Fe-0.25O plate is 130 ksi (896, 3 MPa) and the minimum tensile strength is 115 ksi (792.9 MPa).
    [0011] Given the continued need for reduced fuel consumption by reducing the weight of aircraft and other vehicles, there is a need for an improved alpha / beta ductile titanium alloy that preferably has mechanical properties comparable or superior to those presented by titanium alloy alpha / beta Ti-6Al-4V.
    SUMMARY [0012] According to one aspect of the present disclosure, an alpha / beta titanium alloy comprises, in weight percent based on the weight of the total alloy: 3.9 to
    4.5 aluminum; 2.2 to 3.0 vanadium, 1.2 to 1.8 iron; 0.24 to 0.30 oxygen, up to 0.08 carbon; up to 0.05 nitrogen; up to 0.015 hydrogen; titanium, and up to a total of 0.30 other elements.
    [0013] According to another aspect of the present description, an alpha / beta titanium alloy consists essentially of, in weight percent: 3.9 to 4.5 aluminum; 2.2 to 3.0 vanadium; 1.2 to 1.8 iron; 0.24 to 0.30 of oxygen; up to 0.08
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    5/21 carbon; up to 0.05 nitrogen; up to 0.015 hydrogen; titanium, and up to a total of 0.30 other elements.
    BRIEF DESCRIPTION OF THE DRAWINGS [0014] The characteristics and advantages of the alloys and the respective methods described here can be better understood by reference to the attached drawings, in which:
    [0015] Figure 1 is a graph of extreme tensile strength and resistance to breakage as a function of aluminum equivalent for bar and wire comprised of non-limiting alloy modalities according to the present disclosure.
    [0016] Figure 2 is a graph of extreme tensile strength and breaking strength as a function of aluminum equivalent for 0.5 inch (1.27 cm) diameter wire comprised of non-limiting alloy modalities in accordance with this disclosure; and [0017] Figure 3 is a graph of tensile strength, tear strength and percentage elongation as a function of aluminum equivalent per 1 inch (2.54 cm) thick plate comprised of non-limiting alloy modalities according to present disclosure.
    [0018] The reader will appreciate the previous details, as well as others, when considering the following detailed description of certain non-limiting alloy modalities and respective methods in accordance with the present disclosure.
    DETAILED DESCRIPTION OF CERTAIN NON-LIMITING MODALITIES [0019] In this description of non-limiting modalities, except in the examples of operation or where otherwise indicated, all numbers expressing quantities or characteristics are to be understood as being modified in all cases by the term “ about". Therefore, unless otherwise indicated, all numerical parameters in the description to be
    Petition 870190072454, of 7/29/2019, p. 21/41
    6/21 guir are approximations that can vary depending on the desired properties that are sought in the materials and by the methods according to the present disclosure. At a minimum, and not as an attempt to limit the application of the doctrine of equivalents to the scope of the claims, each numerical parameter must at least be interpreted in the light of the number of significant figures and reported by applying common rounding techniques.
    [0020] Any patent, publication or other disclosure material, which is said to be incorporated, in whole or in part, by reference here, is incorporated here only insofar as the incorporated material does not conflict with existing definitions, instructions or other promotional materials set out in this description. As such, and to the extent necessary, the disclosure as set forth herein replaces any conflicting material incorporated herein by reference. Any material, or portion thereof, that is being incorporated by reference, but which conflicts with existing definitions, statements, or other disclosure material presented here, is only incorporated to the extent that there is no conflict between the incorporated material and existing promotional material.
    [0021] The non-limiting modalities of titanium alpha / beta alloys in accordance with the present disclosure comprise, consist of, or consist essentially of, in weight percent: 3.9 to 4.5 aluminum; 2.2 to 3.0 vanadium,
    1.2 to 1.8 iron; 0.24 to 0.30 of oxygen; up to 0.08 carbon; up to 0.05 nitrogen; up to 0.015 hydrogen; titanium, and up to a total of 0.30 other elements. In certain non-limiting embodiments, according to the present disclosure, the other elements that may be present in the titanium alpha / beta alloy (as part of up to 0.30 weight percent of other elements) include one or more of boron , tin, zirconium, molybdenum, chromium, nickel, silicon, copper, tantalum, niobium, manganese, yttrium and cobalt and, in certain non-limiting modalities, the weight level of each such
    Petition 870190072454, of 7/29/2019, p. 22/41
    7/21 another element present is 0.10 or less, but with two exceptions. The exceptions are boron and yttrium, which, if present absolutely as part of other elements, are present in individual concentrations less than 0.005 weight percent.
    I. Composition of the alloy [0022] Non-limiting modalities of alloys according to the present disclosure include titanium, aluminum, vanadium, iron and oxygen. If only the alloying elements are declared in the compositions discussed below, it is to be understood that the balance comprises titanium and accidental impurities.
    A. Aluminum [0023] Aluminum is an alpha phase strengthener in titanium alloys. The range of aluminum composition in non-limiting modalities of titanium alpha / beta alloys according to the present disclosure is narrower than the range of aluminum disclosed in the '655 patent. In addition, the minimum aluminum level in accordance with certain non-limiting alloy modalities in accordance with the present disclosure is greater than the minimum level established in AMS 6946B. It has been observed that these composition characteristics allow the alloy to more consistently exhibit mechanical properties comparable to the Ti-6Al-4V alloy. The minimum concentration of aluminum in alpha / beta titanium alloys according to the present disclosure is 3.9 weight percent. The maximum concentration of aluminum in alpha / beta titanium alloys according to the present disclosure is 4.5 weight percent.
    B. Vanadium [0024] Vanadium is a beta-phase stabilizer in titanium alloys. The minimum concentration of vanadium in alpha / beta titanium alloys according to the present disclosure is greater than the minimum concentration presented in the '655 patent and contained in AMS 6946B. It was observed that this compositional characteristic provides an optimal, controlled balance of the volume fractions of the alpha and beta phases. O
    Petition 870190072454, of 7/29/2019, p. 23/41
    8/21 balance of alpha and beta phases provides alloys according to the present disclosure with excellent ductility and formability. Vanadium is present in titanium alpha / beta alloys according to the present disclosure, in a minimum concentration of 2.2 weight percent. The maximum concentration of vanadium in titanium alpha / beta alloys according to the present description is 3.0 weight percent.
    C. Iron [0025] Iron is a beta eutetoid stabilizer in titanium alloys. The alpha / beta titanium alloys according to the disclosure of the present invention include a higher minimum concentration and a narrower band of iron compared to the alloy described in the '655 patent. These characteristics were observed to provide an optimal, controlled balance of the volume fractions of the alpha and beta phases. The balance provides alloys according to the present disclosure with excellent ductility and formability. Iron is present in alpha / beta alloys according to the present disclosure, in a minimum concentration of 1.2 percent by weight. The maximum concentration of iron in alpha / beta titanium alloys according to the present description is 1.8 weight percent.
    D. Oxygen [0026] Oxygen is an alpha phase fortifier in titanium alloys. The oxygen composition range in alpha / beta titanium alloys according to the present disclosure is narrower than the ranges disclosed in the '655 patent and in the AMS 6946B specification. In addition, the minimum oxygen concentration in non-limiting modalities for alloys according to the present disclosure is higher than in the '655 patent and in the AMS 6946B specification. It has been observed that these compositional characteristics allow alloys according to the present disclosure that consistently exhibit mechanical properties comparable to certain mechanical properties of Ti-6Al-4V. The minimum oxygen concentration in alpha / beta titanium alloys according to the present disclosure is 0.24 weight percent. The concen
    Petition 870190072454, of 7/29/2019, p. 24/41
    9/21 maximum oxygen traction in alpha / beta titanium alloys according to the present disclosure is 0.30 percent by weight.
    [0027] In addition to the inclusion of titanium, aluminum, vanadium, iron and oxygen, as discussed above, certain non-limiting modalities of titanium alloys alpha / beta according to the present disclosure include other elements in a total concentration not exceeding 0, 30 percent by weight. In certain non-limiting modalities these other elements include one or more of boron, tin, zirconium, molybdenum, chromium, nickel, silicon, copper, niobium, tantalum, manganese, yttrium, and cobalt, where, with two exceptions, the percentage in weight of each of these elements is 0.10 or less. The exceptions are boron and yttrium. If they are present in alloys according to the present disclosure, the weight percentage of each, boron and yttrium, is less than 0.005.
    [0028] Incidental impurities may also be present in titanium alpha / beta alloys in accordance with the present disclosure. For example, carbon can be present up to about 0.008 weight percent. Nitrogen can be present up to about 0.05 weight percent. Hydrogen can be present up to about 0.015 weight percent. Other possible accidental impurities will be evident to those with current knowledge in the metallurgical technique.
    [0029] Table 1 provides a summary of the compositions of (i) certain non-limiting modalities of titanium alpha / beta alloys in accordance with the present disclosure, and (ii) certain alloys disclosed in the '655 patent and specified in AMS 6946B.
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    10/21
    Table 1
    Alloy CompositionsPercent in Weight Element ofturns on Non-limiting modalities in accordance with this disclosure US 5,980,655 AMS 6946B Aluminum 3.9 to 4.5 2.5 to 5.4 3.5 to 4.5 Vanadium 2.2 to 3.0 2.0 to 3.4 2.0 to 3.0 Iron 1.2 to 1.8 0.2 to 2.0 1.2 to 1.8 Oxygen 0.24 to 0.30 0.2 to 0.3 0.20 to 0.30 Carbon 0.08 maximum 0.1 maximum 0.08 maximum Nitrogen 0.05 maximum 0.1 maximum 0.03 maximum Hydrogen 0.015 maximum not specified 0.015 maximum Other elements 0.10 each maximum,0.30 total maximum 0.10 each maximum, no total specified 0.10 each max.mo, 0.30 maximumtotal
    [0030] The present inventors have unexpectedly discovered that the supply of the present alloy with minimum levels of aluminum, oxygen and iron higher than the minimum levels taught in the '655 patent provides an alpha / beta titanium alloy that consistently exhibits mechanical properties, such as strength, for example, at least comparable to certain mechanical properties of the laminated annealed Ti-6Al-4V alloy. The inventors also discovered unexpectedly that increasing the minimum levels and narrowing the iron and vanadium bands in relation to those minimums and bands disclosed in the '655 patent provides alloys that exhibit an optimal and controlled balance of the volume fractions of the phases
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    11/21 alpha and beta in a laminated annealing form. This optimal balance between phases in the alpha / beta titanium alloys according to the present disclosure provides modalities of the alloys with improved ductility compared to the Ti-6Al4V alloys, while retaining the ductility of the alloys disclosed in the '655 patent and specified in the AMS 6946B.
    [0031] One skilled in the art understands that the strength and ductility of metallic materials in general exhibit an inverse relationship. In other words, in general, as the strength of a metallic material increases, the ductility of the material decreases. The combination of increased mechanical strength and retained ductility of the alpha / beta titanium alloys according to the present disclosure was not expected, because an inverse relationship between strength and ductility is generally observed for laminated annealed titanium alloys. The unexpected and surprising combination of increased mechanical strength and retained ductility is a particularly advantageous feature of the alloy modalities according to the present disclosure. It was surprising to note that modes of laminated annealed alloys in accordance with the present disclosure exhibit strengths comparable to those of Ti-6Al-4V alloys without exhibiting decreasing ductility.
    [0032] Some non-limiting modalities of alpha / beta alloys according to the present disclosure having an aluminum equivalent (Aleq) value of at least 6.3, or more, preferably at least 6.4, have been observed to exhibit strength at least comparable to the resistance of Ti-6Al-4V alloys. Such alloys have also been observed to exhibit superior ductility to Ti-6Al-4V alloys, which typically have an aluminum equivalent value of about 7.5. As used here, “aluminum equivalent value” or “aluminum equivalent” (Aleq), means a value equal to the concentration in weight percentage of aluminum in an alloy more than ten times the oxygen concentration in weight percentage of the alloy . In other words, the aluminum equivalent of can be determined from the
    Petition 870190072454, of 7/29/2019, p. 27/41
    12/21 as follows: Aleq = Al (% by weight) + 10 (O (% by weight)).
    [0033] Although it is recognized that the mechanical properties of titanium alloys are generally influenced by the size of the sample being tested, in non-limiting modalities according to the present description an alpha / beta titanium alloy comprises a value of at least aluminum equivalent minus 6.4, that is, in certain modalities within the range of 6.4 to 7.2, and a tensile strength of at least 120 ksi (827.4 MPa), or in a certain modality is at least 130 ksi (896.3 MPa).
    [0034] In other non-limiting modalities in accordance with the present disclosure, an alpha / beta titanium alloy comprises an aluminum equivalent value of at least 6.4 or, in certain modalities is in the range of 6.4 to
    7.2, and a tensile strength in the range of 120 ksi (827.4 MPa) to 155 ksi (1.069 MPa).
    [0035] In still other non-limiting modalities, an alpha / beta titanium alloy according to the present disclosure comprises an aluminum equivalent value of at least 6.4 or, in certain modalities is in the range of 6.4 to
    7.2, and an extreme tensile strength of at least 130 ksi (896.3 MPa) or, in certain embodiments, is at least 140 ksi (965.3 MPa).
    [0036] In other non-limiting modalities according to the present disclosure, an alpha / beta titanium alloy according to the present disclosure comprises an aluminum equivalent value of at least 6.4 or, in certain modalities, is in a 6.4 to 7.2, and extreme tensile strength in the range of 130 ksi (896.3MPa) to 165 ksi (1,138 MPa).
    [0037] In even more non-limiting modalities, an alpha / beta titanium alloy according to the present disclosure comprises an aluminum equivalent value of at least 6.4 or, in certain modalities is in the range of 6.4 to
    7.2, and a ductility of at least 12% or at least 16% (elongation
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    13/21 percentage).
    [0038] In even more non-limiting modalities, an alpha / beta titanium alloy according to the present disclosure comprises an aluminum equivalent value of at least 6.4 or, in certain modalities, is in a range of 6.4 The
    7.2, and a ductility in the range of 12% to 30% (percentage elongation or “% el”).
    [0039] Although according to certain non-limiting modalities of the present disclosure 6.3 is the absolute minimum value for Aleq, the inventors have determined that an Aleq value of at least 6.4 is necessary to achieve the same resistance as that exhibited by the alloy Ti-6Al-4V. It is also recognized that, in other non-limiting modalities of an alpha / beta titanium alloy according to this disclosure, the maximum value for Aleq is 7.5 and that the strength ratio for ductility in accordance with other non-limiting modalities here disclosed applies.
    [0040] According to a non-limiting modality, an alpha / beta titanium alloy according to the present disclosure comprises an aluminum equivalent value of at least 6.4, a breaking strength of at least 120 ksi (827 , 4 MPa), an extreme tensile strength of at least 130 ksi (896.3 MPa) and a ductility of at least 12% (percentage elongation).
    [0041] According to another non-limiting modality, an alpha / beta titanium alloy according to the present disclosure comprises an aluminum equivalent value of at least 6.4, a breaking strength of at least 130 ksi (896, 3 MPa), an extreme tensile strength of at least 140 ksi (965.3 MPa), and a ductility of at least 12%.
    [0042] In yet another non-limiting modality, an alpha / beta titanium alloy according to the present disclosure comprises an aluminum equivalent value in the range of 6.4 to 7.2, a breaking strength in the range of 120 ksi (827.4 MPa) at 155 ksi (1,069 MPa), an extreme tensile strength in the range of 130 ksi (896.3MPa) at 165 ksi (1,138 MPa) and a ductility in the range of 12% to 30% (alon
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    14/21 percentage increase).
    [0043] In a non-limiting modality, an alpha / beta titanium alloy according to the present disclosure has an average extreme tensile strength (UTS) that satisfies the equation:
    [0044] In another non-limiting modality, an alpha / beta titanium alloy according to the present disclosure has a medium breaking strength (YS) that satisfies the equation:
    [0045] In yet another non-limiting modality, an alpha / beta titanium alloy according to the present disclosure has an average ductility of:
    [0046] In yet another non-limiting modality, an alpha / beta titanium alloy according to the present disclosure has an extreme mean tensile strength (UTS) that satisfies the equation:
    UTS> 14,767 (Al eq ) + 48,001;
    a medium breaking strength (YS) that satisfies the equation:
    YS> 13,338 (Al eq ) + 46,864;
    and an average ductility that satisfies the equation:
    % el> 3.3669 (Al eq ) - 1.9417.
    [0047] In a non-limiting modality, an alpha / beta titanium alloy according to the present disclosure has an extreme mean tensile strength (UTS) that satisfies the equation:
    [0048] In another non-limiting modality, an alpha / beta titanium alloy according to the present disclosure has a medium breaking strength (YS) that satisfies the equation:
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    15/21
    [0049] In yet another non-limiting modality, an alpha / beta titanium alloy according to the present disclosure has an average ductility of:
    [0050] In yet another non-limiting modality, an alpha / beta titanium alloy according to the present disclosure has an extreme mean tensile strength (UTS) that satisfies the equation:
    UTS> 12,414 (Al eq ) + 64,429;
    a medium breaking strength (YS) that satisfies the equation:
    YS> 13,585 (Al eq ) + 44,904;
    and an average ductility that satisfies the equation:
    % el> 4,193 (Al eq ) + 7.4409.
    [0051] In a non-limiting modality, an alpha / beta titanium alloy according to the present disclosure has an extreme mean tensile strength (UTS) that satisfies the equation:
    [0052] In another non-limiting modality, an alpha / beta titanium alloy according to the present disclosure has a medium breaking strength (YS) that satisfies the equation:
    [0053] In yet another non-limiting modality, an alpha / beta titanium alloy according to the present disclosure has an average ductility of:
    [0054] In yet another non-limiting modality, an alpha / beta titanium alloy according to the present disclosure has an extreme mean tensile strength (UTS) that satisfies the equation.
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    16/21 a resistance to average rupture (YS) that satisfies the equation: YS> 13,911 (Aleq) + 39,435;
    and an average ductility in percentage elongation (% el), which satisfies the equation:
    % el> 1.1979 (Al eq ) + 8.5604.
    [0055] It was determined that non-limiting modalities of titanium alpha / beta alloys according to the present disclosure exhibit mechanical strength with parable or superior, higher ductility and improved formability compared to Ti-6Al-4V alloy. Therefore, it is possible to use articles formed from alloys according to the present disclosure as substitutes for Ti-6Al-4V alloy articles in the aerospace, aeronautics, naval, automotive and other applications. The high strength and ductility of alloy modalities according to the present disclosure allow the manufacture of certain forms of laminated and finished articles with high tolerances and which cannot presently be manufactured from alloy
    Ti-6Al-4V.
    [0056] One aspect of the present disclosure is directed to articles of manufacture which comprise and / or are made from an alloy in accordance with the present disclosure. Certain non-limiting modalities of articles of manufacture can be selected from an aircraft engine component, an aircraft structural component, an automobile component, a medical device component, a sports equipment component, an applications component ma rhythms and a component of chemical processing equipment. Other articles of manufacture which can comprise and / or be made of titanium alpha / beta alloy modalities in accordance with the present disclosure which are known now or in the future to a person of ordinary skill in the art are within the scope of the modalities here revealed. Articles of manufacture comprising and / or made of alloys according to the present description by force techniques
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    17/21 mation and other manufacturing techniques known now or in the future by those of ordinary skill in the art.
    [0057] The following examples are intended to further describe certain non-limiting modalities, without restricting the scope of the present invention. Those of ordinary skill in the art will appreciate that variations on the following examples, as well as other embodiments that are not specifically described herein, are possible within the scope of the invention, which is defined only by the claims.
    EXAMPLE 1 [0058] Alpha / beta titanium alloy ingots having a composition according to the present disclosure were fused using conventional vacuum arc remelting (VAR), plasma arc melting (PAM), or cold core melting of electron beam (EB) for primary fusion, and were remelted using VAR. The ingot compositions were within the ranges listed in the column “non-limiting modalities according to the present disclosure” included in Table 1 above.
    [0059] The ingot compositions produced in this Example 1 had aluminum equivalent values ranging from about 6.0 to about 7.1. The ingots were processed using various hot rolling practices on cold rolled bars and wires and wires with diameters between 0.25 inch (0.635 cm) and 3.25 inches (8.255 cm). Hot rolling was carried out at starting temperatures between 1550 ° F (843.3 ° C) and 1650 ° F (898.9 ° C). This temperature range is lower than the alpha / beta transus temperature of the alloys in this example, which is from about 1750 ° F to about 1850 ° F (about 954.4 ° C to about 1010 ° C), depending on real chemistry. After hot rolling, the hot rolled bars and wires were annealed at 1275 ° F (690.6 ° C) for one hour, followed by air cooling. The diameter, the aluminum concentration, the iron concentration, the oxygen concentration, and the calculated Aleq, of each of the samples of bars and wires produced 870190072454, of 7/29/2019, p. 33/41
    18/21 in Example 1 are shown in Table 2.
    Table 2 Sample No. Diameter (in) Al (% weight) Fe (% weight) The weight) Al eq (Al% + 10 0%) 1 3.25 4.07 1.56 0.25 6.53 2 3.25 4.10 1.77 0.19 5.96 3 3.25 4.27 1.90 0.19 6.13The C ~ 7 <4 £ 4.UO 1. □ <+ υ, ζυ U.U 1 5 2 4.05 1.55 0.25 6.58 6 2 4.26 1.88 0.21 6.38 7 1 4.35 1.44 0.24 6.74 8 1 4.36 1.28 0.27 7.08 9 0.5 4.38 1.24 0.28 7.15 10 0.5 4.33 1.42 0.25 6.81 11 0.5 4.14 1.47 0.24 6.51 12 0.344 4.37 1.50 0.26 6.95 13 0.25 3.93 1.58 0.23 6.27 14 0.25 4.12 1.56 0.25 6.65 15 0.25 4.40 1.35 0.27 7.10 16 0.25 3.95 1.53 0.24 6.30 17 0.25 4.33 1.35 0.27 7.06
    [0060] Figure 1 shows graphically the final tensile strengths at room temperature (UTS), yield strengths (YS) and percentage elongation (% el) for the bar and wire samples listed in Table 2 as a function of the equivalent value aluminum alloy in the sample. Figure 1 also includes trend lines through the points of UTS, YS and% el determined by linear regression. It is seen that both the average resistance and the average percentage elongation increase with increasing Al eq . This relationship is surprising and unexpected, since it is against the relationship generally observed that increasing resistance is accompanied by decreasing ductility.
    [0061] Typical TÍ-6AI-4V minima for UTS and YS are 135 ksi (930.8 MPa) and 125 ksi (861 MPa 0.8), respectively. The YS for the samples of the invention listed in Table 2 was about 125 ksi for a sample with Al eq of about
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    19/21
    6.0 to about 141 ksi for a sample with Aleq of about 7.1. A sample having an Aleq of about 6.4 exhibited YS of about 130 ksi (896.3 MPa). The UTS for the samples of the invention listed in Table 2 ranged from about 135 ksi for a sample with Aleq of about 6.0 to about 153 ksi for a sample with Aleq of about 7.1. A sample having an Aleq of about 6.4 exhibited YS of about 141 ksi (972 MPa).
    EXAMPLE 2 [0062] Wire samples numbers 9 to 11 of Example 1, having a diameter of 0.5 inch (1.27 cm) and aluminum equivalent values equal to about 6.5, about 6.8 and about 7.15, were tested by traction at room temperature. The results of the tensile tests are presented graphically in Figure 2. All of these samples exhibited tensile and yield strengths that are comparable or superior to the resistances exhibited by the commercial Ti-6Al-4V alloy. As with Figure 1, it can be seen from Figure 2 that increasing Aleq results in high strength together with an increase in the average percentage elongation. As discussed above, this trend is surprising and unexpected, because it is contrary to the generally observed relationship that increasing resistance is accompanied by decreasing ductility. There is less dispersion in the data in Figure 2, which are representative of tests performed on samples of the same size, compared to Figure 1, which is representative of tests performed on samples of different sizes, because the mechanical properties are influenced to some degree by test sample size.
    EXAMPLE 3 [0063] Samples of hot-rolled plate 1 inch (2.54 cm) thick were made from ingots manufactured according to the steps described in Example 1. The alloy ingots had compositions within the ranges listed in column “non-limiting modalities according to the present disclosure
    Petition 870190072454, of 7/29/2019, p. 35/41
    20/21 tion ”in Table 1 above, with aluminum and oxygen concentrations and aluminum equivalent values as listed in Table 3.
    Table 3 Sample No. Diameter (in) Al (% weight) Fe (% weight) The weight) Al eq (Al% + 10-0%) 18 1 4.08 1.53 0.24 6.43 19 1 4.13 1.44 0.24 6.48 20 1 4.22 1.49 0.29 7.12 21 1 4.25 1.40 0.28 7.05 22 1 4.21 1.38 0.29 7.08
    [0064] All hot rolling temperatures were below the alpha / beta transus temperatures of the alloys. The alloys had Aleq values of about 6.5 to about 7.1. The tensile tests at room temperature were used to determine the tensile strength, resistance to rupture and percentage elongation (ductility). The results of stress tests are shown graphically in Figure 3. It can be seen from Figure 3 that alloys including high levels of Al and O, as indicated by calculated aluminum equivalents, exhibited resistance at room temperature at least comparable to levels resistance exhibited by the Ti-6AI-4V alloy. In addition, resistance was observed to increase with increasing Aleq. In addition, the average ductility of the alloys of the invention either increased slightly or remained unchanged in general with increasing Aleq and increasing strength. This trend is surprising and unexpected, since it is against the generally observed relationship that increasing resistance is accompanied by decreasing ductility.
    [0065] This disclosure was written with reference to several exemplary, illustrative and non-limiting modalities. However, it will be recognized by people of ordinary skill in the art that various substitutions, modifications or combinations of any of the disclosed modalities (or portions of the same)
    Petition 870190072454, of 7/29/2019, p. 36/41
    21/21 but) can be made without departing from the scope of the invention as defined only by the claims. Thus, it is contemplated and understood that the present disclosure includes additional modalities that are not expressly established herein. Such modalities can be obtained, for example, through the combination and / or the modification of any of the described steps, of the ingredients, of the constituents, of the components, of the elements, of the characteristics, of the aspects, and similar, of the modalities described here. Thus, this disclosure is not limited by the description of the various exemplary, illustrative and non-limiting modalities, but only by the claims. Therefore, it should be understood that the claims can be changed during the course of the patent application to add resources to the claimed invention as described here in a variety of ways.
    权利要求:
    Claims (7)
    [1]
    1. Titanium alpha / beta alloy, CHARACTERIZED by the fact that it consists of, in percentage by weight based on the total weight of the alloy:
    4.05 to 4.40 aluminum;
    [2]
    2.2 to 3.0 vanadium;
    1.24 to 1.56 iron;
    0.24 to 0.28 of oxygen;
    up to a maximum of 0.08 carbon;
    up to a maximum of 0.05 nitrogen;
    up to a maximum of 0.015 hydrogen;
    up to a total of 0.30 other elements, including at least one of boron, tin, zirconium, molybdenum, chromium, nickel, silicon, copper, niobium, tantalum, manganese, yttrium and cobalt; and the balance of titanium and accidental impurities;
    wherein the concentration of each of boron and yttrium, if present, is less than 0.005;
    where the concentration of each of tin, zirconium, molybdenum, chromium, nickel, silicon, copper, niobium, tantalum, manganese and cobalt, if present, is not greater than 0.10; and where the alloy comprises an aluminum equivalent value of at least 6.8, has a tensile strength of at least 141 ksi (972 MPa), has an extreme tensile strength of at least 142 ksi (979.1 MPa) and has a ductility of at least 20 percent elongation.
    2. Titanium alpha / beta alloy, according to claim 1, CHARACTERIZED by the fact that the alloy comprises an equivalent value of aluminum in the range of 6.8 to 7.2, and has a tensile strength in the range of 141 ksi (972 MPa) to 155 ksi (1,069 MPa).
    Petition 870190072454, of 7/29/2019, p. 38/41
    2/3
    [3]
    3. Alpha / beta titanium alloy, according to claim 1, CHARACTERIZED by the fact that the alloy comprises an equivalent aluminum value in the range of 6.8 to 7.2, and has an extreme tensile strength in the range of 142 ksi (979.1 MPa) to 165 ksi (1,138 MPa).
    [4]
    4. Titanium alpha / beta alloy, according to claim 1, CHARACTERIZED by the fact that the alloy comprises an equivalent aluminum value in the range of 6.8 to 7.2, and has a ductility in the range of 20 to 30 percent stretching.
    [5]
    5. Titanium alpha / beta alloy, according to claim 1, CHARACTERIZED by the fact that the alloy comprises an equivalent value of aluminum in the range of 6.8 to 7.2, has a tensile strength in the range of 141 ksi (972 MPa) to 143.1 ksi (986.6 MPa), has an extreme tensile strength in the range of 142.3 ksi (981.1 MPa) to 154.6 ksi (1,066 MPa), and has a ductility in the 20 to 22 percent stretch range.
    [6]
    6. Alpha / beta titanium alloy, according to claim 1, CHARACTERIZED by the fact that an extreme extreme tensile strength (UTS) in ksi units of the alpha / beta titanium alloy satisfies the equation:
    UTS> 14.767 (Aleq) + 48.001, with a standard deviation of 0.6213;
    where an average tensile strength (YS) in ksi units of the alpha / beta titanium alloy satisfies the equation:
    YS> 13.338 (Aleq) + 46.864; with a standard deviation of 0.4519; and in which an average ductility measured as a percentage of elongation of the alpha / beta titanium alloy satisfies the equation:
    % el> 3.3669 (Aleq) - 1.9417, with a standard deviation of 0.1746;
    where Aleq = aluminum in weight percentage + 10 (oxygen) in weight percentage.
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    3/3
    [7]
    7. Titanium alpha / beta alloy, according to claim 1, CHARACTERIZED by the fact that an average extreme tensile strength (UTS) in ksi units of the alpha / beta titanium alloy satisfies the equation:
    UTS> 12,414 (Aleq) + 64,429, with a standard deviation of 0.9557;
    where an average tensile strength (YS) in ksi units of the alpha / beta titanium alloy satisfies the equation:
    YS> 13.585 (Aleq) + 44.904; with a standard deviation of 0.8138; and in which an average ductility measured as a percentage of elongation of the alpha / beta titanium alloy satisfies the equation:
    % el> 4,1993 (Aleq) - 7.4409, with a standard deviation of 0.1731;
    where Aleq = aluminum in weight percentage + 10 (oxygen) in weight percentage.
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    同族专利:
    公开号 | 公开日
    TWI631222B|2018-08-01|
    AU2011305924B2|2016-04-07|
    TW201224163A|2012-06-16|
    RU2616676C2|2017-04-18|
    JP2013539822A|2013-10-28|
    BR112013005248A2|2018-05-02|
    JP6104164B2|2017-03-29|
    AU2011305924A1|2013-03-28|
    CN103097559A|2013-05-08|
    RU2013118571A|2014-10-27|
    KR20190040094A|2019-04-16|
    KR20180049165A|2018-05-10|
    WO2012039929A1|2012-03-29|
    TW201708555A|2017-03-01|
    MX2013002312A|2013-05-09|
    KR102056035B1|2019-12-13|
    NZ607852A|2015-05-29|
    US20120076686A1|2012-03-29|
    IL224802A|2017-05-29|
    EP2619340A1|2013-07-31|
    MX368806B|2019-10-17|
    PE20131367A1|2013-11-25|
    CA2809035A1|2012-03-29|
    TWI572721B|2017-03-01|
    KR20130099001A|2013-09-05|
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    法律状态:
    2018-06-19| B25D| Requested change of name of applicant approved|Owner name: ATI PROPERTIES LLC (US) |
    2019-04-09| B06F| Objections, documents and/or translations needed after an examination request according [chapter 6.6 patent gazette]|
    2019-04-30| B07A| Application suspended after technical examination (opinion) [chapter 7.1 patent gazette]|
    2019-08-20| B09A| Decision: intention to grant [chapter 9.1 patent gazette]|
    2019-10-01| B16A| Patent or certificate of addition of invention granted [chapter 16.1 patent gazette]|Free format text: PRAZO DE VALIDADE: 20 (VINTE) ANOS CONTADOS A PARTIR DE 07/09/2011, OBSERVADAS AS CONDICOES LEGAIS. (CO) 20 (VINTE) ANOS CONTADOS A PARTIR DE 07/09/2011, OBSERVADAS AS CONDICOES LEGAIS |
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    US12/888.699|2010-09-23|
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    US13/108.045|2011-05-16|
    US13/108,045|US20120076686A1|2010-09-23|2011-05-16|High strength alpha/beta titanium alloy|
    PCT/US2011/050603|WO2012039929A1|2010-09-23|2011-09-07|High strength and ductility alpha/beta titanium alloy|
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