【作者】 王清； 赖静； 孙东立； 张丽萍；

【Author】 WANG Sing LAI Jing SUN Dong-li ZHANG Li-ping (1.School of Materials Science and Engineering,Harbin Institute of Technology,Harbin 150001,China; 2.Beijing Hangxing Machine Manufacture Company,Beijing 100013,China)

【机构】 哈尔滨工业大学材料科学与工程学院； 北京航星机械制造公司；

【摘要】 研究 BT14合金经固溶淬火时效后的显微组织与力学性能。试验结果表明,在450℃～550℃区间短时间时效,可得到良好的强化效果。随时效时间的延长,材料的硬度和强度升高,达到峰值后转而下降。时效温度越高,时间越长,塑性下降的幅度越大。本试验获得的最佳热处理工艺为：900℃/0．5h,水淬+450℃/4h,空冷。经该工艺处理的试样综合力学性能较好,抗拉强度为1223MPa,伸长率为6．5%。淬火形成的马氏体及亚稳β相在时效过程中分解为细小、弥散的α相和β相,时效期间在初生α相内析出 Ti₃Al 相,对合金起到了强化作用。更多还原

【Abstract】 Microstructures and Mechanical Properties of BT14 titanium alloy treated by solution and aging were studied.The results show that the favorable strength is achieved through aging short time in the range of 450℃⁵50℃.The hardness and strength of the alloy increase up to the aging peak and then decrease with aging temperature and time.The optimum heat treatment procedure is 900℃ for 0.5h water quenching and 450℃ for 4h air cooling.The alloy treated by this procedure exhibits the good mechanical properties,the tensile strength is 1223MPa and the elongation is 6.5%.Fine and dispersive（α+β）phases are formed by decomposing martensite and metastable β and Ti₃Al particles are precipitated from primary α phase during aging,they play the strengthening role for the alloy.更多还原