热处理工艺对Ti62421s高温钛合金组织与力学.pdf

第 20 卷第 12 期 中国有色金属学报 2010 年 12 月 Vol.20 No.12 The Chinese Journal of Nonferrous Metals Dec. 2010 文章编号：1004-0609(2010)12-2298-09 热处理工艺对 Ti62421s 高温钛合金组织与力学性能的影响 王志辉，夏长清，彭小敏，陈志宏，李学雄 ( 中南大学 材料科学与工程学院，长沙 410083) 摘 要：研究固溶温度和时效温度对 Ti62421s 高温钛合金显微组织、相成分和常温拉伸性能的影响。结果表明： 在两相区进行固溶处理时，随着固溶温度的升高，合金组织中的 α相减少，β 转变组织(βt)增多，当固溶温度进入 β 相区后为篮网状β 转变组织；随着时效温度的升高，α相长大；随着固溶温度和时效温度的升高，β 转变组织中 只有 Al 含量升高，其他合金元素的含量都下降；随着固溶温度的升高，强度和断面收缩率先升高后迅速降低， 伸长率逐渐下降；经(980 ℃，1 h，AC)+(550 ℃，8 h，AC)热处理后，合金可以获得较好的综合性能，抗拉强度 达 1 077.04 MPa，伸长率达 13.6%，断面收缩率为26.02% 。 关键词：钛合金；Ti62421s ；热处理；显微组织；力学性能 中图分类号：TG146.2 文献标志码：A Effect of heat treatment on microstructure and mechanical properties of Ti62421s high temperature titanium alloy WANG Zhi-hui, XIA Chang-qing, PENG Xiao-min, CHEN Zhi-hong, LI Xue-xiong (School of Materials Science and Engineering, Central South University, Changsha 410083, China) Abstract: The effect of solution temperature and aging temperature on the microstructure and mechanical properties of Ti62421s high temperature titanium alloy were studied. The results show that, the content of primary α-phase decreases and the content of transformed β phase increases with increasing solution temperature when the alloy is treated in α+β field, only weave transformed β-phase exists when the alloy is treated in β field. With the aging temperature increasing, primary α-phase size grows up. With increasing solution temperature and aging temperature, only the content of aluminum increases in the transformed β-phase, where as the contents of other alloying elements decrease. With the solution te