WO2012015602A1 - Hot stretch straightening of high strength alpha/beta processed titanium - Google Patents

Hot stretch straightening of high strength alpha/beta processed titanium Download PDF

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Publication number
WO2012015602A1
WO2012015602A1 PCT/US2011/043951 US2011043951W WO2012015602A1 WO 2012015602 A1 WO2012015602 A1 WO 2012015602A1 US 2011043951 W US2011043951 W US 2011043951W WO 2012015602 A1 WO2012015602 A1 WO 2012015602A1
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WIPO (PCT)
Prior art keywords
titanium alloy
straightened
temperature
straightening
solution treated
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PCT/US2011/043951
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English (en)
French (fr)
Inventor
David J. Bryan
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ATI Properties LLC
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ATI Properties LLC
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Publication date
Priority to JP2013521810A priority Critical patent/JP6058535B2/ja
Priority to UAA201302392A priority patent/UA111336C2/uk
Priority to BR112013001386-9A priority patent/BR112013001386B1/pt
Priority to CA2803386A priority patent/CA2803386C/en
Priority to EP11738897.5A priority patent/EP2598666B1/en
Priority to CN201180035819.6A priority patent/CN103025907B/zh
Priority to RU2013108814/02A priority patent/RU2538467C2/ru
Priority to KR1020137000860A priority patent/KR101833571B1/ko
Priority to NZ606375A priority patent/NZ606375A/en
Priority to MX2013000393A priority patent/MX349903B/es
Application filed by ATI Properties LLC filed Critical ATI Properties LLC
Priority to AU2011283088A priority patent/AU2011283088B2/en
Publication of WO2012015602A1 publication Critical patent/WO2012015602A1/en
Priority to IL224041A priority patent/IL224041B/en
Priority to ZA2013/00192A priority patent/ZA201300192B/en
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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Classifications

    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22F—CHANGING THE PHYSICAL STRUCTURE OF NON-FERROUS METALS AND NON-FERROUS ALLOYS
    • C22F1/00—Changing the physical structure of non-ferrous metals or alloys by heat treatment or by hot or cold working
    • C22F1/16—Changing the physical structure of non-ferrous metals or alloys by heat treatment or by hot or cold working of other metals or alloys based thereon
    • C22F1/18—High-melting or refractory metals or alloys based thereon
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C14/00—Alloys based on titanium
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21D—WORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21D3/00—Straightening or restoring form of metal rods, metal tubes, metal profiles, or specific articles made therefrom, whether or not in combination with sheet metal parts
    • B21D3/12—Straightening or restoring form of metal rods, metal tubes, metal profiles, or specific articles made therefrom, whether or not in combination with sheet metal parts by stretching with or without twisting
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21D—WORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21D1/00—Straightening, restoring form or removing local distortions of sheet metal or specific articles made therefrom; Stretching sheet metal combined with rolling
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21D—WORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21D3/00—Straightening or restoring form of metal rods, metal tubes, metal profiles, or specific articles made therefrom, whether or not in combination with sheet metal parts
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
    • C21D9/00—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor
    • C21D9/0075—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor for rods of limited length
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22F—CHANGING THE PHYSICAL STRUCTURE OF NON-FERROUS METALS AND NON-FERROUS ALLOYS
    • C22F1/00—Changing the physical structure of non-ferrous metals or alloys by heat treatment or by hot or cold working
    • C22F1/16—Changing the physical structure of non-ferrous metals or alloys by heat treatment or by hot or cold working of other metals or alloys based thereon
    • C22F1/18—High-melting or refractory metals or alloys based thereon
    • C22F1/183—High-melting or refractory metals or alloys based thereon of titanium or alloys based thereon
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T428/00—Stock material or miscellaneous articles
    • Y10T428/12—All metal or with adjacent metals
    • Y10T428/12299—Workpiece mimicking finished stock having nonrectangular or noncircular cross section

Definitions

  • the present disclosure is directed to methods for straightening high strength titanium alloys aged in the ⁇ + ⁇ phase field.
  • Titanium alloys typically exhibit a high strength-to-weight ratio, are corrosion resistant, and are resistant to creep at moderately high temperatures. For these reasons, titanium alloys are used in aerospace and aeronautic applications including, for example, landing gear members, engine frames and other critical structural parts. Titanium alloys also are used in jet engine parts such as rotors, compressor blades, hydraulic system parts, and nacelles.
  • ⁇ -titanium alloys have gained increased interest and application in the aerospace industry, ⁇ -titanium alloys are capable of being processed to very high strengths while maintaining reasonable toughness and ductility properties.
  • the low flow stress of ⁇ -titanium alloys at elevated temperatures can result in improved processing.
  • ⁇ -titanium alloys can be difficult to process in the ⁇ + ⁇ phase field because, for example, the alloys' ⁇ -transus temperatures are typically in the range of 1400°F to 1600°F (760°C to 871 .1 °C).
  • fast cooling such as water or air quenching, is required after ⁇ + ⁇ solution treating and aging in order to achieve the desired mechanical properties of the product.
  • a straight ⁇ + ⁇ solution treated and aged ⁇ -titanium alloy bar may warp and/or twist during quenching.
  • ⁇ + ⁇ titanium alloys such as, for example, Ti-6AI-4V alloy
  • expensive vertical solution heat treating and aging processes are conventionally employed to minimize distortion.
  • a typical example of the prior art STA processing includes suspending a long part, such as a bar, in a vertical furnace, solution treating the bar at a temperature in the ⁇ + ⁇ phase field, and aging the bar at a lower temperature in the ⁇ + ⁇ phase field. After fast quenching, e.g., water quenching, it may be possible to straighten the bar at temperatures lower than the aging temperature. Suspended in a vertical orientation, the stresses in the rod are more radial in nature and result in less distortion.
  • An STA processed Ti-6AI-4V alloy (UNS R56400) bar can then be straightened by heating to a temperature below the aging temperature in a gas furnace, for example, and then straightened using a 2-plane, 7-plane, or other, straightener known to a person of ordinary skill.
  • a 2-plane, 7-plane, or other, straightener known to a person of ordinary skill.
  • vertical heat treatment and water quenching operations are expensive and the capabilities are not found in all titanium alloy manufacturers
  • a non-limiting embodiment of a method for straightening an age hardened metallic form selected from one of a metal and a metal alloy includes heating an age hardened metallic form to a straightening temperature.
  • the straightening temperature is in a straightening temperature range from 0.3 of the melting temperature in kelvin (0.3Tm) of the age hardened metallic form to at least 25°F (13.9°C) below an aging temperature used to harden the age hardened metallic form.
  • An elongation tensile stress is applied to the age hardened metallic form for a time sufficient to elongate and straighten the age hardened metallic form to provide a straightened age hardened metallic form.
  • the straightened age hardened metallic form deviates from straight by no greater than 0.125 inch (3.175 mm) over any 5 foot length (152.4 cm) or shorter length.
  • the straightened age hardened metallic form is cooled while simultaneously applying a cooling tensile stress to the straightened age hardened metallic form that is sufficient to balance the thermal cooling stresses in the alloy and maintain a deviation from straight of no greater than 0.125 inch (3.175 mm) over any 5 foot length (152.4 cm) or shorter length of the straightened age hardened metallic form.
  • a method for straightening a solution treated and aged titanium alloy form includes heating a solution treated and aged titanium alloy form to a straightening temperature.
  • the straightening temperature comprises a straightening temperature in the ⁇ + ⁇ phase field of the solution treated and aged titanium alloy form.
  • the straightening temperature range is 1 100°F (61 1 .1 °C) below a beta transus temperature of the solution treated and aged titanium alloy form to 25°F
  • the cooling tensile stress is sufficient to balance a thermal cooling stress in the straightened solution treated and aged titanium alloy form and maintain a deviation from straight of no greater than 0.125 inch (3.175 mm) over any 5 foot length (152.4 cm) or shorter length of the straightened solution treated and aged titanium alloy form.
  • FIG. 1 is a flow diagram of a non-limiting embodiment of a hot stretch straightening method for titanium alloy forms according to the present disclosure
  • FIG. 2 is a schematic representation for measuring deviation from straight of metallic bar material
  • FIG. 3 is a flow diagram of a non-limiting embodiment of a hot stretch straightening method for metallic product forms according to the present disclosure
  • FIG. 4 is a photograph of solution treated and aged bars of Ti-10V-2Fe-
  • FIG. 5 is a temperature versus time chart for straightening Serial # 1 bar of the non-limiting example of Example 7;
  • FIG. 6 is a temperature versus time chart for straightening Serial # 2 bar of the non-limiting example of Example 7;
  • FIG. 7 is a photograph of solution treated and aged bars of Ti-10V-2Fe- 3AI alloy after hot stretch straightening according to a non-limiting embodiment of this disclosure;
  • FIG. 8 includes micrographs of microstructures of the hot stretch straightened bars of non-limiting Example 7;
  • FIG. 9 includes micrographs of non-straightened solution treated and aged control bars of Example 9.
  • a non-limiting embodiment of a hot stretch straightening method 10 for straightening a solution treated and aged titanium alloy form comprises heating 12 a solution treated and aged titanium alloy form to a straightening temperature.
  • the straightening temperature is a temperature within the ⁇ + ⁇ phase field.
  • the straightening temperature is in a straightening temperature range from about 1 100°F (61 1 .1 °C) below the beta transus temperature of the titanium alloy to about 25° below the age hardening temperature of the solution treated and aged alloy form.
  • solution treated and aged refers to a heat treating process for titanium alloys that includes solution treating a titanium alloy at a solution treating temperature in the two-phase region, i.e., in the ⁇ + ⁇ phase field of the titanium alloy.
  • the solution treating temperature is in a range from about 50°F (27.8°C) below the ⁇ -transus temperature of the titanium alloy to about 200°F (1 1 1 .1 °C) below the ⁇ -transus temperature of the titanium alloy.
  • a solution treatment time ranges from 30 minutes to 2 hours.
  • the solution treatment time may be shorter than 30 minutes or longer than 2 hours and is generally dependent upon the size and cross-section of the titanium alloy form.
  • This two-phase region solution treatment dissolves much of the a-phase present in the titanium alloy, but leaves some a-phase remaining, which pins grain growth to some extent.
  • the titanium alloy is water quenched so that a significant portion of alloying elements is retained in the ⁇ -phase.
  • the solution treated titanium alloy is then aged at an aging temperature, also referred to herein as an age hardening temperature, in the two-phase field, ranging from 400°F (222.2°C) below the solution treating temperature to 900°F (500°C) below the solution treating temperature for an aging time sufficient to precipitate fine grain a-phase.
  • the aging time may range from 30 minutes to 8 hours. It is recognized that in certain non-limiting embodiments, the aging time may be shorter than 30 minutes or longer than 8 hours longer and is generally dependent upon the size and cross-section of the titanium alloy form.
  • the STA process produces titanium alloys exhibiting high yield strength and high ultimate tensile strength. The general techniques used in STA processing an alloy are known to practitioners of ordinary skill in the art and, therefore, are not further elaborated herein.
  • an elongation tensile stress is applied 14 to the STA titanium alloy form for a time sufficient to elongate and straighten the STA titanium alloy form and provide a straightened STA titanium alloy form.
  • the elongation tensile stress is at least about 20% of the yield stress of the STA titanium alloy form at the straightening temperature and not equivalent to or greater than the yield stress of the STA titanium alloy form at the straightening temperature.
  • the applied elongation tensile stress may be increased during the straightening step in order to maintain elongation.
  • the elongation tensile stress is increased by a factor of 2 during elongation.
  • the STA titanium alloy product form comprises Ti-10V-2Fe-3AI alloy (UNS 56410), which has a yield strength of about 60 ksi at 900°F (482.2°C), and the applied elongation stress is about 12.7 ksi at 900°F at the beginning of straightening and about 25.5 ksi at the end of the elongation step.
  • the straightened STA titanium alloy form deviates from straight by no greater than 0.125 inch (3.175 mm) over any 5 foot length (152.4 cm) or shorter length.
  • the STA titanium alloy form when the STA titanium alloy form is sufficiently straightened, the STA titanium alloy form is cooled 16 while simultaneously applying a cooling tensile stress 18 to the straightened solution treated and aged titanium alloy form.
  • the cooling tensile stress is sufficient to balance a thermal cooling stress in the straightened STA titanium alloy form so that the STA titanium alloy form does not warp, curve, or otherwise distort during cooling.
  • the cooling stress is equivalent to the elongation stress.
  • the cooling tensile stress is sufficient to maintain a deviation from straight of no greater than 0.125 inch (3.175 mm) over any 5 foot length (152.4 cm) or shorter length of the straightened STA titanium alloy form.
  • the elongation tensile stress and the cooling tensile stress are sufficient to enable creep forming of the STA titanium alloy form. Creep forming takes place in the normally elastic regime. While not wanting to be bound by any particular theory, it is believed that the applied stress in the normally elastic regime at the straightening temperature allows grain boundary sliding and dynamic dislocation recovery that results in straightening of the product form. After cooling and compensating for the thermal cooling stresses by maintaining a cooling tensile stress on the product form, the moved dislocations and grain boundaries assume the new elastic state of the STA titanium alloy product form.
  • a method 20 for determining the deviation from straight of a product form such as, for example, a bar 22
  • the bar 22 is lined up next to a straight edge 24.
  • the curvature of the bar 22 is measured at curved or twisted locations on the bar with a device used to measure length, such as a tape measure, as the distance the bar curves away from the straight edge 24.
  • the distance of each twist or curve from the straight edge is measured along a prescribed length of the bar 28 to determine the maximum deviation from straight (26 in FIG. 2), i.e., the maximum distance of the bar 22 from the straight edge 24 within the prescribed length of the bar 22.
  • the same technique may be used to quantify deviation from straight for other product forms.
  • the straightened STA titanium alloy form deviates from straight by no greater than 0.094 inch (2.388 mm) over any 5 foot length (152.4 cm) or shorter length of the straightened STA titanium alloy form.
  • the straightened STA titanium alloy form deviates from straight by no greater than 0.094 inch (2.388 mm) over any 5 foot length (152.4 cm) or short length of the straightened STA titanium alloy form.
  • the straightened STA titanium alloy form deviates from straight by no greater than 0.25 inch (6.35 mm) over any 10 foot length (304.8 cm) or shorter length of the straightened STA titanium alloy form.
  • the straightened STA titanium alloy form deviates from straight by no greater than 0.25 inch (6.35 mm) over any 10 foot length (304.8 cm) or shorter length of the straightened STA titanium alloy form.
  • the STA titanium alloy form In order to uniformly apply the elongation and cooling tensile stresses, in a non-limiting embodiment according to the present disclosure, the STA titanium alloy form must be capable of being gripped securely across the entire cross-section of the STA titanium alloy form.
  • the shape of the STA titanium alloy form can be the shape of any mill product for which adequate grips can be fabricated to apply a tensile stress according to the method of the present disclosure.
  • a "mill product" as used herein is any metallic, i.e., metal or metal alloy, product of a mill that is subsequently used as-fabricated or is further fabricated into an intermediate or finished product.
  • an STA titanium alloy form comprises one of a billet, a bloom, a round bar, a square bar, an extrusion, a tube, a pipe, a slab, a sheet, and a plate.
  • Grips and machinery for applying the elongating and cooling tensile stresses according to the present disclosure are available from, for example, Cyril Bath Co., Monroe, North Carolina, USA.
  • a surprising aspect of this disclosure is the ability to hot stretch straighten STA titanium alloy forms without significantly reducing the tensile strengths of the STA titanium alloy forms.
  • the average yield strength and average ultimate tensile strength of the hot stretch straightened STA titanium alloy form according to non-limiting methods of this disclosure are reduced by no more than 5 percent from values before hot stretch straightening.
  • the largest change in properties produced by hot stretch straightening that was observed was in percent elongation.
  • the average value for percent elongation of a titanium alloy form exhibited an absolute reduction of about 2.5% after hot stretch straightening. Without intending to be bound by any theory of operation, it is believed that a decrease in percent elongation may occur due to the elongation of the STA titanium alloy form that occurs during non- limiting embodiments of hot stretch straightening according to this disclosure.
  • a straightened STA titanium alloy form may be elongated by about 1 .0% to about 1 .6% versus the length of the STA titanium alloy form prior to hot stretch straightening.
  • Heating the STA titanium alloy form to a straightening temperature may employ any single or combination of forms of heating capable of maintaining the straightening temperature of the bar, such as, but not limited to, heating in a box furnace, radiant heating, and induction heating the form.
  • the temperature of the form must be monitored to ensure that the temperature of the form remains at least 25°F (13.9°C) below the aging temperature used during the STA process.
  • the temperature of the form is monitored using thermocouples or infrared sensors.
  • other means of heating and monitoring the temperature known to persons of ordinary skill in the art are within the scope of this disclosure.
  • the straightening temperature of the STA titanium alloy form should be relatively uniform throughout and should not vary from location to location by more than 100°F (55.6°C).
  • the temperature at any location of the STA titanium alloy form preferably does not increase above the STA aging temperature, because the mechanical properties, including, but not limited to the yield strength and ultimate tensile strength, could be detrimentally affected.
  • heating to the straightening temperature comprises heating at a heating rate from 500°F/min (277.8°C/min) to 1000°F/min (555.6°C/min).
  • any localized area of the STA titanium alloy form preferably should not reach a temperature equal to or greater than the STA aging temperature.
  • the temperature of the form should always be at least 25°F
  • the STA aging temperature (also variously referred to herein as the age hardening temperature, the age hardening temperature in the ⁇ + ⁇ phase field, and the aging temperature) may be in a range of 500°F (277.8°C) below the ⁇ -transus temperature of the titanium alloy to 900°F (500°C) below the ⁇ -transus temperature of the titanium alloy.
  • the straightening temperature is in a straightening temperature range of 50°F (27.8°C) below the age hardening temperature of the STA titanium alloy form to 200°F (1 1 1 .1 °C) below the age hardening temperature of the STA titanium alloy form, or is in a straightening temperature range of 25°F (13.9°C) below the age hardening temperature to 300°F (166.7°C) below the age hardening temperature.
  • a non-limiting embodiment of a method according to the present disclosure comprises cooling the straightened STA titanium alloy form to a final temperature at which point the cooling tensile stress can be removed without changing the deviation from straight of the straightened STA titanium alloy form.
  • cooling comprises cooling to a final temperature no greater than 250°F (121 .1 °C). The ability to cool to a temperature higher than room temperature while being able to relieve the cooling tensile stress without deviation in straightness of the STA titanium alloy form allows for shorter straightening cycle times between parts and improved productivity.
  • cooling comprises cooling to room temperature, which is defined herein as about 64°F (18°C) to about 77°F (25°C).
  • an aspect of this disclosure is that certain non-limiting embodiments of hot stretch straightening disclosed herein can be used on substantially any metallic form comprising many, if not all, metals and metal alloys, including, but not limited to, metals and metal alloys that are conventionally considered to be hard to straighten.
  • non-limiting embodiments of the hot stretch straightening method disclosed herein were effective on titanium alloys that are conventionally considered to be hard to straighten.
  • the titanium alloy form comprises a near a-titanium alloy.
  • the titanium alloy form comprises at least one of Ti-8AI-1 Mo-1 V alloy (UNS 54810) and Ti-6AI-2Sn-4Zr-2Mo alloy (UNS R54620).
  • the titanium alloy form comprises an ⁇ + ⁇ -titanium alloy.
  • the titanium alloy form comprises at least one of Ti-6AI-4V alloy (UNS R56400), Ti-6AI-4V ELI alloy (UNSR56401 ), Ti-6AI-2Sn-4Zr-6Mo alloy (UNS R56260), Ti-5AI-2Sn-2Zr-4Mo-4Cr alloy (UNS R58650), and Ti-6AI-6V-2Sn alloy (UNS R56620).
  • the titanium alloy form comprises a ⁇ -titanium alloy.
  • the titanium alloy form comprises one of Ti-10V-2Fe-3AI alloy
  • the titanium alloy form is a Ti-10V-2Fe-3AI alloy (UNS 56410) form.
  • certain ⁇ -titanium alloys for example, Ti-10V-2Fe- 3AI alloy, it is not possible to straighten STA forms of these alloys to the tolerances disclosed herein using conventional straightening processes, while also maintaining the desired mechanical properties of the alloy.
  • the ⁇ transus temperature is inherently lower than commercially pure titanium. Therefore, the STA aging temperature also must be lower.
  • STA ⁇ -titanium alloys such as, but not limited to, Ti-10V-2Fe-3AI alloy can exhibit ultimate tensile strengths higher than 200 ksi (1379 MPa).
  • straightened titanium alloy forms and methods of straightening STA titanium alloy forms, non-limiting embodiments of hot stretch straightening disclosed herein may be used successfully on virtually any age hardened metallic product form, i.e., a metallic product comprising any metal or metal alloy.
  • a method 30 for straightening a solution treated and age hardened metallic form including one of a metal and a metal alloy comprises heating 32 a solution treated and age hardened metallic form to a straightening temperature in a straightening temperature range from 0.3 of a melting temperature in kelvin (0.3T m ) of the age hardened metallic form to a temperature of at least 25°F (13.9°C) below the aging temperature used to harden the age hardened metallic form.
  • the elongation tensile stress is at least about 20% of the yield stress of the age hardened metallic form at the straightening temperature and is not equivalent to or greater than the yield stress of the STA titanium alloy form at the straightening temperature.
  • the applied elongation tensile stress may be increased during the straightening step in order to maintain elongation.
  • the elongation tensile stress is increased by a factor of 2 during elongation.
  • the straightened age hardened metallic form deviates from straight by no greater than 0.125 inch (3.175 mm) over any 5 foot length (152.4 cm) or shorter length. In a non-limiting embodiment, the straightened age hardened metallic form deviates from straight by no greater than 0.094 inch (2.388 mm) over any 5 foot length (152.4 cm) or shorter length of the straightened age hardened metallic form. In still another non-limiting embodiment, the straightened age hardened metallic form deviates from straight by no greater than 0.25 inch (6.35 mm) over any 10 foot (304.8 cm) length of the straightened age hardened metallic form.
  • a non-limiting embodiment according to the present disclosure comprises cooling 36 the straightened age hardened metallic form while simultaneously applying 38 a cooling tensile stress to the straightened age hardened metallic form.
  • the cooling tensile stress is sufficient to balance a thermal cooling stress in the straightened age hardened metallic form so that the straightened age hardened metallic form does not warp, curve, or otherwise distort during cooling.
  • the cooling stress is equivalent to the elongation stress.
  • the cooling tensile stress is sufficient to balance a thermal cooling stress in the alloy so that the age hardened metallic form does not warp, curve, or otherwise distort during cooling.
  • the cooling tensile stress is sufficient to balance a thermal cooling stress in the alloy so that the age hardened metallic form maintains a deviation from straight of no greater than 0.125 inch (3.175 mm) over any 5 foot length (152.4 cm) or shorter length of the straightened age hardened metallic form.
  • the cooling stress is sufficient to balance a thermal cooling stress in the alloy so that the age hardened metallic form maintains a deviation from straight of no greater than 0.094 inch (2.388 mm) over any 5 foot length (152.4 cm) or shorter length.
  • the cooling stress is sufficient to balance a thermal cooling stress in the alloy so that the age hardened metallic form maintains a deviation from straight of no greater than 0.25 inch (6.35 mm) over any 10 foot (304.8 cm) length of the
  • the solution treated and age hardened metallic form comprises one of a titanium alloy, a nickel alloy, an aluminum alloy, and a ferrous alloy. Also, in certain non-limiting embodiments according to the present disclosure, the solution treated and age hardened metallic form is selected from a billet, a bloom, a round bar, a square bar, an extrusion, a tube, a pipe, a slab, a sheet, and a plate.
  • the straightening temperature is in a range from 200°F (1 1 1 .1 °C) below the age hardening temperature used to harden the age hardened metallic form up to 25°F (13.9°C) below the age hardening temperature used to harden the age hardened metallic form.
  • EXAMPLE 2 [0054] Two 1 .875 inch (47.625 mm) diameter, 10 foot (3.048 m) bars of Ti-10V-
  • 2Fe-3AI alloy were used for this example.
  • the bars were rolled at a temperature in the ⁇ + ⁇ phase field from rotary forged re-roll that was produced from upset and single recrystallized billet. Elevated temperature tensile tests at 900°F (482.2°C) were performed to determine the maximum diameter of bar that could be straightened with the available equipment. The elevated temperature tensile tests indicated that a 1 .0 inch (2.54 cm) diameter bar was within the equipment limitations. The bars were peeled to 1 .0 inch (2.54 cm) diameter bars. The bars were then solution treated at 1460°F (793.3°C) for 2 hours and water quenched. The bars were aged for 8 hours at 940°F (504.4°C).
  • the straightness of the bars was measured to deviate approximately 2 inch (5.08 cm) from straight with some twist and wave.
  • the STA bars exhibited two different types of bow.
  • the first bar (Serial #1 ) was observed to be relatively straight at the ends and had a gentle bow to the middle of approximately 2.1 inch (5.334 cm) from straight.
  • the second bar (Serial #2) was fairly straight near the middle, but had kinks near the ends.
  • the maximum deviation from straight was around 2.1 inch (5.334 cm).
  • the surface finish of the bars in the as-quenched condition exhibited a fairly uniform oxidized surface.
  • FIG. 4 is a representative photograph of the bars after solution treating and aging.
  • Example 2 The solution treated and aged bars of Example 2 were hot stretch straightened according to a non-limiting embodiment of this disclosure.
  • the solution treated and aged bars of Example 2 were hot stretch straightened according to a non-limiting embodiment of this disclosure.
  • thermocouple located at the middle of the part.
  • two additional thermocouples were welded to the parts near their ends.
  • the first bar experienced a failed main control thermocouple, resulting in oscillations during the heat ramp. This, along with another control anomaly, led to the part exceeding the desired temperature of 900°F (482.2°C).
  • the high temperature achieved was approximately 1025° F (551 .7°C) for less than 2 minutes.
  • the first bar was re-instrumented with another thermocouple, and a similar overshoot occurred due to an error in the software control program from the previous run.
  • the first bar was heated with the maximum power permitted, which can heat a bar of the size used in this example from room temperature to 1000°F (537.8°C) in approximately 2 minutes.
  • thermocouple number 2 (TC#2), which was positioned near one end of the bar. It is believed that TC#2 experienced a mild hot junction failure when under power.
  • thermocouple number 0 (TC#0)
  • TC#1 thermocouple number 1
  • TC#1 thermocouple number 1
  • the cycle time for the first bar was 50 minutes.
  • the bar was cooled to 250°F (121 .1 °C) while maintaining the tonnage on the bar that was applied at the end of the elongation step.
  • the first bar was elongated 0.5 inch (1 .27 cm) over the span of 3 minutes.
  • the tonnage during that phase was increased from 5 tons (44.5 kN) initially to 10 tons (89.0 kN) after completion. Because the bar has a 1 inch (2.54 cm) diameter, these tonnages translate to tensile stresses of 12.7 ksi (87.6 MPa) and 25.5 ksi
  • the part had also experienced elongation in the previous heat cycles that were discontinued due to temperature control failure.
  • the total measured elongation after straightening was 1 .31 inch (3.327 cm).
  • the second bar (Serial #2) was carefully cleaned near the thermocouple attachment points and the thermocouples were attached and inspected for obvious defects.
  • the second bar was heated to a target set point of 900° F (482.2°C).
  • TC#1 recorded a temperature of 973°F (522.8°C), while TC#0 and TC#2 recorded
  • the hot stretch straightened bars (Serial #1 and Serial #2) are shown in the photograph of FIG. 7.
  • the bars had a maximum deviation from straight of 0.094 inch (2.387 mm) over any 5 foot (1 .524 m) length.
  • Serial #1 bar was lengthened by 1 .313 inch (3.335 cm), and
  • Serial #2 bar was lengthened by 2.063 inch (5.240 cm) during hot stretch straightening.
  • microstructures of the un-straightened control bars of Example 5 are presented in FIG. 9. It is observed that the microstructures are very similar.
  • the present disclosure has been written with reference to various exemplary, illustrative, and non-limiting embodiments. However, it will be recognized by persons having ordinary skill in the art that various substitutions, modifications, or combinations of any of the disclosed embodiments (or portions thereof) may be made without departing from the scope of the invention as defined solely by the claims. Thus, it is contemplated and understood that the present disclosure embraces additional embodiments not expressly set forth herein. Such embodiments may be obtained, for example, by combining and/or modifying any of the disclosed steps, ingredients, constituents, components, elements, features, aspects, and the like, of the

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NZ606375A NZ606375A (en) 2010-07-28 2011-07-14 Hot stretch straightening of high strength alpha/beta processed titanium
BR112013001386-9A BR112013001386B1 (pt) 2010-07-28 2011-07-14 Método para endireitar uma forma de liga de titânio envelhecida e tratada com solução
CA2803386A CA2803386C (en) 2010-07-28 2011-07-14 Hot stretch straightening of high strength alpha/beta processed titanium
EP11738897.5A EP2598666B1 (en) 2010-07-28 2011-07-14 Hot stretch straightening of high strength alpha/beta processed titanium
CN201180035819.6A CN103025907B (zh) 2010-07-28 2011-07-14 高强度α/β加工钛的热拉伸矫直
RU2013108814/02A RU2538467C2 (ru) 2010-07-28 2011-07-14 Горячая правка растяжением высокопрочного титанового сплава, обработанного в области альфа/бета-фаз
KR1020137000860A KR101833571B1 (ko) 2010-07-28 2011-07-14 고 강도 알파／베타 처리된 티타늄의 열 신장 교정
JP2013521810A JP6058535B2 (ja) 2010-07-28 2011-07-14 α／β処理を施した高強度チタンの熱延による歪み矯正
UAA201302392A UA111336C2 (uk) 2010-07-28 2011-07-14 Гаряча правка розтяжкою високоміцного титанового сплаву в області альфа/бета-фаз
MX2013000393A MX349903B (es) 2010-07-28 2011-07-14 Enderezamiento por estiramiento en caliente de titanio alfa/beta procesado de alta resistencia.
AU2011283088A AU2011283088B2 (en) 2010-07-28 2011-07-14 Hot stretch straightening of high strength alpha/beta processed titanium
IL224041A IL224041B (en) 2010-07-28 2012-12-31 Hot surface alignment of high strength alpha/bata machined titanium
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