热处理温度对TA7钛合金板材组织与力学性能的影响  

Effect of Heat Treatment on Microstructure and Mechanical Properties of TA7 Titanium Alloy Sheets

作　　者：马佳琨 张苗 冯军宁[1,2] 郭金榜 马忠贤[1,2] 解晨 冯永琦[1,2] Ma Jiakun;Zhang Miao;Feng Junning;Guo Jinbang;Ma Zhongxian;Xie Chen;Feng Yongqi(Baoti Group Co.,Ltd.,Baoji 721014,China;Baoji Titanium Industry Co.,Ltd.,Baoji 721014,China)

机构地区：[1]宝钛集团有限公司,陕西宝鸡721014 [2]宝鸡钛业股份有限公司,陕西宝鸡721014

出　　处：《钛工业进展》2023年第6期27-30,共4页Titanium Industry Progress

摘　　要：研究了TA7钛合金板材热加工态和经750、800、850℃3种不同温度热处理后的显微组织、室温拉伸性能、弯曲性能、高温拉伸性能和高温持久性能。结果表明,热加工态TA7钛合金板材横向存在不均匀组织,纵向有较多拉长α晶粒;经750℃热处理后板材拉长α晶粒转变为等轴状;经800℃热处理后板材横向与纵向均为均匀、细小的等轴组织;经850℃热处理后板材晶粒发生长大。热处理后板材强度降低,塑性增加,弯曲性能和高温持久性能均满足GJB 2505A—2018标准要求;随着热处理温度的升高,板材室温拉伸强度和高温拉伸强度均逐渐降低,经850℃热处理后板材的500℃高温拉伸强度已不能满足要求。为了获得均匀、细小的组织及良好的力学性能,TA7钛合金板材宜采用800℃热处理。The microstructure,room temperature tensile properties,bending performance,high temperature tensile properties and high temperature durability of TA7 titanium alloy sheets in hot working state and after heat treatment at three different temperatures of 750,800 and 850℃were investigated.The results show that the microstructure of TA7 titanium alloy sheet in hot working state has uneven organization in the transverse direction and significant elongatedαgrain in the longitudinal direction.The elongatedαgrain of the sheet becomes equiaxed after heat treated at 750℃.The microstructures of the sheet in transverse and longitudinal are uniform,fine equiaxial organization after heat treated at 800℃.The grains of the sheet grow up after heat treated at 850℃.After heat treatment,the strength of sheet decreases,the plasticity increases,the bending performance and high temperature durability both can meet the requirements of GJB 2505A—2018 standard.With the increase of heat treatment temperature,the room temperature and high temperature tensile strength of the sheet are gradually reduced.The 500℃high temperature tensile strength of the sheet can’t meet the requirements after heat treatment at 850℃.In order to obtain uniform,fine microstructure and good mechanical properties,TA7 titanium alloy sheet should be heat treated at 800℃.

关 键 词：TA7钛合金 板材 热处理 显微组织 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]