Research on microstructure and numerical simulation of laser welding joint of titanium/steel dissimilar metal

钛/钢异种金属激光焊接接头微观组织及数值模拟研究 Research on microstructure and numerical simulation of laser welding joint of titanium/steel dissimilar metal 杨胜 YANG Sheng 1 first-author 李军兆 LI Junzhao 2 3 刘一搏 LIU Yibo 2 3 孙清洁 SUN Qingjie 2 3 湖南湘投金天科技集团有限责任公司 湖南湘投金天科技集团有限责任公司 Hunan Xiangtou Holding Group Co.,Ltd Hunan Xiangtou Holding Group Co.,Ltd 哈尔滨工业大学先进焊接与连接国家重点实验室 哈尔滨工业大学先进焊接与连接国家重点实验室 State Key Laboratory of Advanced Welding and Joining,Harbin Institute of Technology State Key Laboratory of Advanced Welding and Joining,Harbin Institute of Technology 哈尔滨工业大学(威海)山东省特种焊接技术重点实验室 哈尔滨工业大学(威海)山东省特种焊接技术重点实验室 Shandong Provincial Key Laboratory of Special Welding Technology,Harbin Institute of Technology at Weihai Shandong Provincial Key Laboratory of Special Welding Technology,Harbin Institute of Technology at Weihai 为实现TC4钛合金与316L不锈钢异种金属的优质连接,采用Cu作为中间层进行激光焊接。研究表明,采用Cu中间层能够有效抑制界面脆性Ti-Fe金属间化合物的产生。随着焊接速度的增加,接头强度显著提高,TC4钛合金与焊缝界面主要为连续的Ti-Fe化合物层和非连续的Ti-Fe、Ti-Cu化合物层,厚度约为60μm。有效地降低了接头脆性、抑制裂纹,缓解了接头应力,能够获得良好的钛/钢异种金属激光焊接接头。 Cu was used as the intermediate layer for laser welding to realize the high quality joining of TC4 tita-nium alloy and 316 L stainless steel dissimilar metal. The results show that the Cu interlayer can effectively inhibit the brittle Ti-Fe intermetallic compound produced at the inter-face. And the tensile strength of welded joint significantly improves as welding speed increases. The interface of TC4 titanium alloy and weld is mainly composed of continuous Ti-Fe compound layer and intermittent Ti-Fe and Ti-Cu compound layers with thickness of 60 μm. The brittleness of welded joint is reduced,cracks are inhibited and joint stress is relieved,and good titanium/steel dissimilar metal laser welded joint is obtained. 钛合金 不锈钢 激光焊接 数值模拟 组织 titanium alloy stainless steel laser welding numerical simulation microstructure TG456.7 2022-03-08 8 50