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

YANG Sheng; LI Junzhao; LIU Yibo; SUN Qingjie

doi:10.7512/j.issn.1001-2303.2020.08.21

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Research on microstructure and numerical simulation of laser welding joint of titanium/steel dissimilar metal
Vol. 50, Issue 8, Pages: 101-105(2020)
DOI： 10.7512/j.issn.1001-2303.2020.08.21

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YANG Sheng, LI Junzhao, LIU Yibo, et al. Research on microstructure and numerical simulation of laser welding joint of titanium/steel dissimilar metal. [J]. 50(8):101-105(2020)
DOI：

YANG Sheng, LI Junzhao, LIU Yibo, et al. Research on microstructure and numerical simulation of laser welding joint of titanium/steel dissimilar metal. [J]. 50(8):101-105(2020) DOI： 10.7512/j.issn.1001-2303.2020.08.21.

摘要

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。

Abstract

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.