热处理工艺对大规格TC17钛合金棒材组织与力学性能的影响  

Effect of Heat Treatment Process on Microstructure and Mechanical Properties of Large Size TC17 Titanium Alloy Bar

作　　者：郭萍[1] 强菲 王欢 张磊[1] Guo Ping;Qiang Fei;Wang Huan;Zhang Lei(Northwest Institute for Nonferrous Metal Research,Xi’an 710016,China)

机构地区：[1]西北有色金属研究院,陕西西安710016

出　　处：《钛工业进展》2024年第3期19-23,共5页Titanium Industry Progress

基　　金：国家重点研发计划项目(2022YFB3705601);西安市科技计划项目(22GXFW0142);基础加强计划技术领域基金项目(2021-JCJQ-JJ-0197)。

摘　　要：研究了固溶温度、冷却方式、保温时间及取样方向对两相区锻造的大规格TC17钛合金棒材显微组织和力学性能的影响,并根据实验结果选择最佳热处理制度。结果表明:TC17钛合金棒材的最佳热处理工艺为800℃/2h/WQ+630℃/8h/AC;固溶温度在两相区时,随着固溶温度的升高,合金强度升高,塑性降低;固溶空冷+时效的合金较相同温度固溶水冷+时效的合金强度高、塑性低;在相同温度固溶水冷条件下,缩短固溶保温时间,可改善合金的塑性;锻造后的TC17钛合金大规格棒材存在各向异性。Effects of solution temperature,cooling method,holding time and sampling direction on the microstructure and mechanical properties of large size TC17 titanium alloy bar were studied,and the best heat treatment was selected according to the experimental results.The results show that the optimum heat treatment process of TC17 titanium alloy is 800℃/2 h/WQ+630℃/8 h/AC.Heat treatment inα+βphase zone and the same cooling conditions,the strength of the alloy increases and the plasticity decreases with the increasing of solution temperature within the two phase region.The strength of the alloy is higher and the plasticity is lower after solid solution treatment followed by air cooling and aging than that after solid solution treatment followed by water cooling and aging at the same temperature.The ductility of the alloy can be improved by shortening solution holding time under the same temperature and water cooling.The large size TC17 titanium alloy bar after being forged exists anisotropism.

关 键 词：TC17钛合金 大规格棒材 热处理工艺 微观组织 力学性能 

分 类 号：TG166.5[金属学及工艺—热处理] TG146.23[金属学及工艺—金属学]