材料工程2025，Vol.53Issue(9)：74-81,8.DOI:10.11868/j.issn.1001-4381.2023.000673
TC21损伤容限型钛合金线性摩擦焊接头组织和性能
Microstructure and properties of TC21 damage-tolerant titanium alloy LFWed joint
摘要
Abstract
The phase transformation behaviors of the joint are studied using scanning electron microscope and electron backscattered diffraction,and the comprehensive mechanical properties of joint are enhanced by annealing heat treatment.The results show that complete dynamic recrystallization and β→α΄ phase transformation occur in the weld zone(WZ)of the as welded joint.Under the thermo-mechanical coupling effect,the rod-shaped α phase exhibits significant elongation deformation along the friction direction in the thermo-mechanically affected zone,accompanied by obvious decomposition and breaking spheroidization.In the heat-affected zone,the rod-shaped α phase within the grains is similar as the base metal,whereas the secondary α phase in the original β matrix is completely dissolved under high temperature during welding.After welding,fine secondary lamellar α phase precipitates at the boundary between α and β phase.The tensile property tests reveal that WZ is the weak area of the joint.The tensile strength,elongation and section shrinkage of the joints are 1048.6 MPa,6.1%and 5.7%,respectively.After annealing heat treatment of 570℃,large number of fine acicular secondary α phases whose are interweaved are precipitated in WZ,resulting in the damage tolerance microstructural characteristics(interweaved secon-dary α)of TC21 titanium alloy are restored in WZ.Therefore,the tensile strength and elongation are obviously increased to 1131.4 MPa and 9.4%,respectively.关键词
TC21损伤容限型钛合金/线性摩擦焊/热处理/性能优化Key words
TC21 damage-tolerant titanium alloy/linear friction welding/heat treatment/mechanical pro-perty optimization分类
通用工业技术引用本文复制引用
荣怀清,马铁军,郭震国,陶军,李菊,李文亚..TC21损伤容限型钛合金线性摩擦焊接头组织和性能[J].材料工程,2025,53(9):74-81,8.基金项目
国防基础科研计划资助项目(JCKY2018205B026) （JCKY2018205B026）
