固溶温度对Ti-3.5Al-5Mo-6V-3Cr-2Sn-0.5Fe合金组织和性能的影响  

Effect of solution treatment temperature on microstructure and properties of Ti-3.5Al-5Mo-6V-3Cr-2Sn-0.5Fe alloy

作　　者：张俊[1] 张冰[1] Zhang Jun;Zhang Bing(Department of Mechanical and Electrical Engineering,Shandong Water Conservancy Vocational College,Rizhao Shandong 276800,China)

机构地区：[1]山东水利职业学院机电工程系,山东日照276800

出　　处：《金属热处理》2024年第11期191-194,共4页Heat Treatment of Metals

摘　　要：利用扫描电镜、透射电镜、X射线衍射仪及拉伸试验机,研究了固溶温度(850、820、790、760℃)对固溶时效(550℃时效4 h)Ti-3.5Al-5Mo-6V-3Cr-2Sn-0.5Fe耐蚀钛合金板材显微组织及力学性能的影响。结果表明,钛合金原始板材和热处理后的显微组织均由等轴α相和残留β相组成。随着固溶温度的升高,α相含量降低,β相含量升高。热处理降低了钛合金板材的内应力和位错密度,伸长率得到改善。随着固溶温度的升高,时效后试验钛合金的抗拉强度先增加后降低,伸长率先降低后升高。经过820℃固溶+时效的钛合金抗拉强度最高,其RD和TD方向的抗拉强度分别为1387 MPa和1357 MPa,伸长率分别为3.7%和4.1%。Effect of solution treatment temperature(850,820,790,760℃)on microstructure and mechanical properties of Ti-3.5Al-5Mo-6V-3Cr-2Sn-0.5Fe corrosion-resistant titanium alloy plate aged at 550℃for 4 h was studied by means of scanning electron microscope,transmission electron microscope,X-ray diffractometer and tensile testing machine.The results indicate that the microstructure of both the original and heat treated titanium alloy plate is composed of equiaxedαphase and retainedβphase.As the solution treatment temperature increases,the content ofαphase decreases while the content ofβphase increases.The heat treatment reduces the internal stress and dislocation density of the titanium alloy plate,thus improves the elongation.As the solution treatment temperature increases,the tensile strength of the aged titanium alloy first increases and then decreases,while the elongation is opposite.The titanium alloy solution treated at 820℃and aged has the highest tensile strength,with tensile strengths of 1387 MPa and 1357 MPa in the RD and TD directions,and elongation of 3.7%and 4.1%,respectively.

关 键 词：耐蚀钛合金 固溶处理 时效 显微组织 力学性能 

分 类 号：TG156[金属学及工艺—热处理] TG146.23[金属学及工艺—金属学]