Patent ID: 9297059
Filing Date: 2016-03-29
CPC Classification: C22C,C22F

Claim Text:
1. A manufacturing method for wrought articles of near-beta titanium alloys comprising ingot melting and thermomechanical processing wherein the melted ingot consists of, titanium and, in weight percentages, 4.0 to 6.0 aluminum, 4.5 to 6.0 vanadium, 4.5 to 6.0 molybdenum, 2.0 to 3.6 chromium, 0.2 to 0.5 iron, less than or equal to 2.0 zirconium, less than or equal to 0.2 oxygen, and less than or equal to 0.05 nitrogen, the method comprising heating to a temperature that is 150° C. to 380° C. above BTT and hot working at a strain of 40% to 70%; heating to a temperature that is 60° C. to 220° C. above BTT and hot working at a strain of 30% to 60%; heating to a temperature that is 20° C. to 60° C. below BTT and hot working at a strain of 30% to 60% with subsequent recrystallization via metal heating to a temperature that is 70° C. to 140° C. above BTT and hot working at a strain of 20% to 60%, cooling down to the ambient temperature, then heating to a temperature that is 20° C. to 60° C. below BTT and hot working with a strain of 30% to 70%; and additional recrystallization via metal heating to a temperature that is 30° C. to 110° C. above BTT and hot working with a strain of 15% to 50% followed by cooling down to ambient temperature, then heating to a temperature that is 20° C. to 60° C. below BTT and hot working with a strain of 50% to 90%; and subsequent final hot working.