(北京航星机器制造公司, 北京 100013)
摘 要: 对新型高温钛合金BTi-62421S进行卷圆、冷/热冲压成形、热涨性、热成形等实验研究，获得了该合金的热成形性能；通过高温超塑性拉伸试验，获得了该合金超塑性成形的最佳工艺参数，并进行该合金框架、舵面零件的超塑性成形试验。结果表明：BTi-62421S钛合金在(620±10)℃下保温20~25 min可实现筒形件的热涨形，在750 ℃左右可实现口框类零件的热成形，但热成形性能存在各向异性；该合金在温度为920 ℃，应变速率为1.0×10−3 s−1时具有最佳超塑性能，伸长率达到448.5%，在此条件下可成形出满足设计要求的舵面及框架样件。
关键字: BTi-62421S钛合金；热涨形；热成形；超塑成形
high-temperature BTi-62421S titanium alloy
（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 the strain rate of 1.5×10−4 s−1. A BTi-62421S titanium alloy frame and a rudder satisfying with the design requirements can be formed successfully under this condition.
Key words: BTi-62421S titanium alloy; hot bulging; hot forming; superplastic deformation
