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TC4钛合金水下湿法激光焊接焊缝组织与性能
秦航1, 蔡志海1, 朱加雷2, 王凯2, 柳建1
1.陆军装甲兵学院 机械产品再制造国家工程研究中心, 北京 100072;2.北京石油化工学院, 北京 102617
摘要:
使用光纤激光器对TC4钛合金进行了水下湿法激光焊接试验,通过在TC4表面预置焊接辅助剂实现了增加水下湿法焊接熔深的同时对焊缝进行保护的目的. 对焊缝的微观组织和力学性能进行了分析,结果表明,预置焊接辅助剂后,焊缝熔深增大,焊接阈值增加,焊缝中裂纹减少. 焊缝中心主要由初生α和马氏体组织α'相组成,在熔池底部还保留有粗大的β晶界,焊缝由于水的急冷作用出现了淬硬组织,显微硬度远高于TC4母材. 水下焊接拉伸试验试件均断裂在焊缝处,焊接接头平均抗拉强度值为439 MPa,呈现为脆性断裂.
关键词:  TC4钛合金  水下湿法激光焊接  微观组织  力学性能
DOI:10.12073/j.hjxb.2019400328
分类号:TG456.7
基金项目:
Microstructure and properties of TC4 titanium alloy by direct underwater laser beam welding
QIN Hang1, CAI Zhihai1, ZHU Jialei2, WANG Kai2, LIU Jian1
1.National Engineering Research Center for Mechanical Product Remanufacturing, Army Academy of Armored Forces, Beijing 100072, China;2.Beijing Institute of Petrochemical Technology, Beijing 102617, China
Abstract:
An optical fiber laser was used to fabricate TC4 titanium alloy welding by direct underwater laser beam welding. The purpose of increasing the penetration depth and protecting the weld were realized by presetting a weld auxiliary to the surface of TC4. The microstructure and mechanical property was analyzed, and the results showed that both the penetration depth and the welding threshold increases, while the cracks reduces. The weld center is mainly composed of primary α and martensitic α' phases, and there is still a large β grain boundary at the bottom of the molten pool. Due to the quench effect of water, the weld underwater has quenched structure, and its microhardness is much higher than that of TC4 base metal. The tensile test specimens of underwater welding are all fractured at the weld joint, and the average tensile strength of the welded joint is 439 MPa, showing brittle fracture.
Key words:  TC4 titanium alloy  direct underwater laser beam welding  microstructure  mechanical property