热处理工艺对近α钛合金组织与性能的影响  

Effect of heat treatment process on microstructure and mechanical properties of a near-alpha titanium alloy

作　　者：孙鹏 孙瑞琦 王伟龙 崔文芳 Sun Peng;Sun Ruiqi;Wang Weilong;Cui Wenfang(School of Material Science and Engineering,Shenyang 110819,China;Key Laboratory for Anisotropy and Texture of Materials(Ministry of Education),Shenyang 110819,China)

机构地区：[1]东北大学材料科学与工程学院,沈阳110819 [2]东北大学材料各向异性与织构教育部重点实验室,沈阳110819

出　　处：《材料与冶金学报》2021年第3期217-222,共6页Journal of Materials and Metallurgy

基　　金：国家自然科学基金项目(51525101)。

摘　　要：研究了固溶和时效工艺参数对一种近α钛合金Ti-5Al-2Nb-2Zr-1.5Mo显微组织与力学性能的影响.结果表明:在α+β两相区,随着固溶温度的升高,初生α相含量(体积分数,下同)减少,亚稳相含量增加,冷却过程中分解的针状马氏体α′相使合金的硬度升高;时效温度的变化通过影响α′相分解析出次生α相的尺寸、数量及分布方式影响合金的力学性能,合金经960℃固溶,500℃时效4 h后维氏硬度达到峰值374,屈服强度和抗拉强度分别达到874,982 MPa.The effects of solid solution and aging heat treatment on microstructure and mechanical properties of Ti-5 Al-2 Nb-2 Zr-1.5 Mo alloy were studied.The results show that with the increase of solution temperature,the content of primaryαphase decreases and metastable phase increases,the hardness of the material increases with the increase of solution temperature due to acicular martensiteα′phase.Aging temperature affects the size,quantity and distribution of secondaryαphase to affect the mechanical properties of the alloy.After solution at 960℃and aging at 500℃for 4 h,HV of the alloy reaches the peak value of 374,the yield strength and the tensile strength of the alloy reaches 874 MPa and 982 MPa,respectively.

关 键 词：近Α钛合金 热处理 显微组织 力学性能 

分 类 号：TG146.2[一般工业技术—材料科学与工程]