International Journal of Mineral Processing and Extractive Metallurgy

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Interfacial Microstructure Evolution and Mechanical Properties of Laser Welding Joints for Stainless Steel to TiNi Shape Memory Alloy

In this paper, laser welding of stainless steel and TiNi shape memory alloy dissimilar materials was carried. Microstructures of the joints were analyzed by means of scanning electron microscopy (SEM), energy dispersive spectroscopy (EDS) and X-ray diffraction (XRD). Mechanical properties of the joints were evaluated by tensile tests. Based on avoiding the formation of Ti-Fe intermetallics in the joint, three welding processes for SS-TiNi alloy joint were introduced. The joint A was formed while the laser was acted on the SS-TiNi alloy interface and joint fractured along the SS side in weld immediately after welding without filler metal. The joint B was formed while the laser was acted on the Cu interlayer. Experimental results showed that Cu interlayer was helping to decrease the Ti-Fe intermetallics by forming Ti-Cu phases in the weld. The tensile strength of the joint B was 216 MPa. The joint C was formed while the laser was acted on the SS side 1.0 mm. One process was one pass welding involving creation of a joint with one fusion weld and one brazed weld separated by remaining unmelted SS. The mechanical performance of the joint C was determined by the brazed weld formed at SS-TiNi alloy interface with a tensile strength of 256 MPa.

Stainless Steel, TiNi Alloy, Cu Interlayer, Laser Welding, Microstructure, Tensile Strength

APA Style

Zhijin Guo, Yan Zhang, Jianping Zhou, Daqian Sun, Hongmei Li. (2022). Interfacial Microstructure Evolution and Mechanical Properties of Laser Welding Joints for Stainless Steel to TiNi Shape Memory Alloy. International Journal of Mineral Processing and Extractive Metallurgy, 7(3), 75-84. https://doi.org/10.11648/j.ijmpem.20220703.12

ACS Style

Zhijin Guo; Yan Zhang; Jianping Zhou; Daqian Sun; Hongmei Li. Interfacial Microstructure Evolution and Mechanical Properties of Laser Welding Joints for Stainless Steel to TiNi Shape Memory Alloy. Int. J. Miner. Process. Extr. Metall. 2022, 7(3), 75-84. doi: 10.11648/j.ijmpem.20220703.12

AMA Style

Zhijin Guo, Yan Zhang, Jianping Zhou, Daqian Sun, Hongmei Li. Interfacial Microstructure Evolution and Mechanical Properties of Laser Welding Joints for Stainless Steel to TiNi Shape Memory Alloy. Int J Miner Process Extr Metall. 2022;7(3):75-84. doi: 10.11648/j.ijmpem.20220703.12

Copyright © 2022 Authors retain the copyright of this article.
This article is an open access article distributed under the Creative Commons Attribution License (http://creativecommons.org/licenses/by/4.0/) which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

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