BTi-62421S高温钛合金热成形和超塑成形性能.PDF

20 1 2010 10 Vol.20 Special 1 The Chinese Journal of Nonferrous Metals Oct. 2010 1004-0609(2010)S1-s0770-05 BTi-62421S (, 100013) BTi-62421S / BTi-62421S (620±10) 20~25 min 750 920 −3 s−1 448.5% 1.010 BTi-62421S TG457.19 A Hot forming and superplastic forming performance of high-temperature BTi-62421S titanium alloy SHI Ke, GUO Xiao-lin, WANG Meng-tuan (Beijing Hangxing Machinery Manufacturing Co., Beijing 100013, China) Abstract: Experiments including crimping, cold pressing, hot pressing, hot bulging, hot forming were carried out to achieve the hot deforming performance of BTi-62421S alloy. The tensile tests under superplastic temperature were also carried out to determine the optimum parameters of superplastic forming. Furthermore, a BTi-62421S alloy frame and a rudder were superplastic deformed. The results show BTi-62421S alloy tube can be hot-bulged at (620±10) for 20−25 min, and a big cage part can be hot-formed at about 750 although the alloy is anisotropic. BTi-62421S alloy has the optimal superplastic performance with the elongation of 448.5% when being deformed at the temperature of 920 and −4 s−1. A BTi-62421S titanium alloy frame and a rudder satisfying with the design requirements the strain rate of 1.510 can be formed successfully under this condition. Key words: BTi-62421S titanium alloy; hot bulging; hot forming; superplastic deformation BTi-62421S [1] Al-Sn-Zr-Nb-Mo-