Ti75合金激光焊接接头的组织及力学性能  

Microstructure and mechanical properties of laser welded Ti75 alloy joint

作　　者：曹守启[1] 何鑫 刘婉荣 冯杰才 CAO Shouqi;HE Xin;LIU Wanrong;FENG Jiecai(School of Engineering,Shanghai Ocean University,Shanghai 201306,China;Shanghai Ruirong Laser Welding Technology Co.LTD.,Shanghai 201306,China)

机构地区：[1]上海海洋大学工程学院,上海201306 [2]上海锐戎激光焊接技术有限公司,上海201306

出　　处：《材料科学与工艺》2021年第1期53-58,共6页Materials Science and Technology

基　　金：上海市产学研合作“先进激光智能制造装备关键技术研究与示范线建设”项目(沪临地管委经【2017】56号)。

摘　　要：采用10 kW的连续光纤激光器对3 mm厚的Ti75合金板进行激光焊接,通过调整不同的激光功率来获得全熔透的焊接接头。同时,观察了不同热输入下焊接接头的宏观形貌、微观组织,测试了焊接接头的力学性能和显微硬度,对接头不同部位的组织特征及成形原因进行了分析。结果表明,随着焊接过程中激光功率的增加,焊缝的宽度逐渐变大,在不同热输入下,发现焊接的接头部位均呈现出3个明显的部分,分别为焊缝(WS)、熔合线(FL)以及热影响区(HAZ),焊接接头发生了动态再结晶;焊接接头的抗拉强度可达到母材水平,硬度值高于母材。Laser welding of Ti75 alloy plate of 3 mm thick is performed using 10 kW continuous fiber laser.The full penetration welding joint is obtained by adjusting the laser power.The morphologies,and microstructure of the joint obtained under different heat input was examined.The tensile properties and microhardness of the welded joint were tested.The microstructure characteristics and formation mechanism of different locations in the joint were analyzed.The results indicate that,as the laser power increase,the weld width gradually increases.The joint consist of three parts,i.e.,welding seam(WS),fusion line(FL)and heat affected zone(HAZ)under different heat input.the joint cross section under different heat input.Dynamic recrystallization occurred in the welding joint.The tensile strength of the welded joint can reach the level of the base material.The hardness of the joint is higher than that of the base material.

关 键 词：钛合金 激光焊接 显微组织 拉伸性能 显微硬度 

分 类 号：TG456.7[金属学及工艺—焊接]