Patent ID: 6284071
Filing Date: 2001-09-04
Classification: C22C,C22F

Abstract:
A method of producing titanium alloy parts having good heat resistance, comprising subjecting a titanium alloy composition consisting essentially of, by weight %, Al: 5.0-7.0%, Sn: 3.0-5.0%, Zr: 2.5-6.0%, Mo: 2.0-4.0%, Si: 0.05-0.80%, C: 0.001-0.200%, O: 0.05-0.20%, and the balance of Ti and inevitable impurities to the following sequential treatment steps:(1) a heat treatment step in .beta.-region;(2) a rapid cooling step after the heat treatment in step (1) at a cooling rate higher than that of air-cooling to a temperature of 700.degree. C. or lower;(3) a slow cooling step from a temperature of 700.degree. C. or lower at a cooling rate of air cooling or lower;(4) a hot processing step in .alpha.+.beta. region carried out at a temperature of .beta.-transformation point or lower at a forging ratio of 3 or higher;(5) a solid solution treatment at a temperature of .beta.-transformation point.+-.30.degree. C; and(6) an aging treatment at a temperature of 570-650.degree. C.