30-01-2020 дата публикации
Номер: US20200032833A1
Принадлежит:
A method for increasing tensile strength of a cold workable alpha-beta titanium alloy comprises solution heat treating a cold workable alpha-beta titanium alloy in a temperature range of T−106° C. to T−72.2° C. for 15 minutes to 2 hours; cooling the alpha-beta titanium alloy at a cooling rate of at least 3000° C./minute; cold working the alpha-beta titanium alloy to impart an effective strain in the range of 5 percent to 35 percent in the alloy; and aging the alpha-beta titanium alloy in a temperature range of T−669° C. to T−517° C. for 1 to 8 hours. Fastener stock and fasteners including solution treated, quenched, cold worked, and aged alpha-beta titanium alloys are also disclosed. 1. A method for producing an alpha-beta titanium alloy fastener stock , comprising:heating an alpha-beta titanium alloy in a temperature range of 866° C. to 899° C. for 15 minutes to 2 hours;water quenching the alpha-beta titanium alloy;cold working the alpha-beta titanium alloy using at least one of cold drawing and cold swaging the alpha-beta titanium alloy to impart an effective strain in the range of 5 percent to 35 percent to the alpha-beta titanium alloy; andaging the alpha-beta titanium alloy in a temperature range of 302° C. to 454° C. for 1 to 8 hours; 2.9 to 5.0 aluminum;', '2.0 to 3.0 vanadium;', '0.4 to 2.0 iron;', '0.2 to 0.3 oxygen;', '0.005 to 0.3 carbon;', 'titanium;', 'impurities; and, 'wherein the alpha-beta titanium alloy comprises, in percentages by weight based on total alloy weightoptionally, one or more of tin, zirconium, molybdenum, chromium, nickel, silicon, copper, niobium, tantalum, manganese, cobalt, boron and yttrium;wherein the sum of the weight percentages of any tin, zirconium, molybdenum, chromium, nickel, silicon, copper, niobium, tantalum, manganese, cobalt, boron, and yttrium present in the titanium alloy is less than 0.5 weight percent;wherein the individual concentrations of any tin, zirconium, molybdenum, chromium, nickel, silicon, copper, niobium, ...
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