ffects of V/Nb Composite Interlayer on Microstructure and Mechanical Properties of NiTi Alloy/Stainless Steel Dissimilar Metal Laser Welding

doi:10.3901/JME.2022.08.136

Abstract

Abstract: :To prevent the formation of brittle intermetallic compounds such as Ti-Fe and Ti-Ni, the dissimilar metal of NiTi alloy and 301 SS were welded by V/Nb multi-interlayer and double laser welding. The microstructures and mechanical properties of the joints were studied by means of optical microscopy, scanning electron microscopy and energy dispersive spectrometer (EDS). The results show that the mixing of NiTi alloy and 301 SS is prevented by the presence of unmelted V and Nb during welding processing, thus no brittle intermetallic compounds such as Ti-Fe and Ti-Ni are formed in the joints. The maximum tensile strength of the joints increased to 280 MPa. The 301 SS and V were joined by fusion welding for first pass welding, while the two metallurgical bonding zones based on different bonding mechanisms were obtained in the second pass welding. V and Nb was joined by the fusion welding mechanism, and contact reaction brazing was responsible for bonding Nb and NiTi.

Key words: NiTi alloy, 301 SS, interlayer, joint properties, intermetallic compounds

CLC Number:

TG406

WANG Xiaoqiang, GAO Xiaolong, LIU Jing, LI Lunkun. ffects of V/Nb Composite Interlayer on Microstructure and Mechanical Properties of NiTi Alloy/Stainless Steel Dissimilar Metal Laser Welding[J]. Journal of Mechanical Engineering, 2022, 58(8): 136-142.

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