热处理对锻态TC21钛合金组织及性能的影响  

Effect of heat treatment on microstructure and properties of as⁃forged TC21 titanium alloy

作　　者：何睿[1] 王杰[1,2] 尹慧 翟瑞志 向伟 吕东莉 尹耀吉[1] He Rui;Wang Jie;Yin Hui;Zhai Ruizhi;Xiang Wei;LüDongli;Yin Yaoji(School of New Energy and Materials,Southwest Petroleum University,Chengdu Sichuan 610500,China;School of Materials Science and Engineering,Changsha University of Technology,Changsha Hunan 410114,China;China National Erzhong Group Deyang Wanhang Die Forging Co.,Ltd.,Deyang Sichuan 618000,China)

机构地区：[1]西南石油大学新能源与材料学院,四川成都610500 [2]长沙理工大学材料科学与工程学院,湖南长沙410114 [3]中国第二重型机械集团德阳万航模锻有限责任公司,四川德阳618000

出　　处：《金属热处理》2024年第4期201-208,共8页Heat Treatment of Metals

基　　金：四川省自然科学基金(2022NSFSC0325);德阳市科技计划(2021JBJZ011)。

摘　　要：设计12种固溶+时效处理工艺,对不同固溶温度(880~920℃)与时效温度(500~650℃)锻态TC21钛合金的显微组织与力学性能进行研究。结果表明,随着固溶温度的升高,初生α相的含量降低、尺寸变小,钛合金的塑性也随之变差;在同一固溶温度下,时效温度变化影响次生α相的含量及尺寸,随时效温度的升高,次生α相的弥散程度增大,钛合金的屈服强度呈先增后降的趋势,当时效温度过高,达到650℃时,次生α相会变粗大。只进行920℃×2 h固溶处理的试样R_(p0.2)=1107.0 MPa,Rm=1238.5 MPa,后续时效处理的加入使屈服强度与抗拉强度大幅提升,通过920℃×2 h固溶+590℃×4 h时效处理可使锻态TC21钛合金获得优良的综合力学性能,R_(p0.2)=1237.7 MPa,Rm=1322.0 MPa。12 kinds of solution treatment+aging processes were designed to study the microstructure and mechanical properties of as⁃forged TC21 titanium alloy under different solution treatment(880⁃920℃)and aging temperatures(500⁃650℃).The results show that as the solution treatment temperature rises,there is a reduction in the primaryαphase′s volume and dimensions,leading to decreased ductility.At the same solution temperature,the change in aging temperature affects the content and size of the secondaryαphase.With the aging temperature increasing,the dispersion degree of the secondaryαphase increases,and the yield strength of the titanium alloy increases first and then decreases.When the aging temperature is too high,and reaches 650℃the secondaryαphase becomes coarse.Specimen is subjected only to solution treat at 920℃for 2 h,Which exhibites a yield strength(R_(p0.2))of 1107.0 MPa and a tensile strength(Rm)of 1238.5 MPa.The addition of subsequent aging treatment significantly enhances the yield and tensile strength.Especially,by solution treatment at 920℃for 2 h followed by aging at 590℃for 4 h,the as⁃forged TC21 titanium alloy achieves excellent comprehensive mechanical properties,with a yield strength(R_(p0.2))of 1237.7 MPa and a tensile strength(Rm)of 1322.0 MPa.

关 键 词：TC21钛合金 固溶时效 显微组织 力学性能 

分 类 号：TG146.23[一般工业技术—材料科学与工程]