期刊
JOURNAL OF MATERIALS RESEARCH AND TECHNOLOGY-JMR&T
卷 18, 期 -, 页码 1028-1037出版社
ELSEVIER
DOI: 10.1016/j.jmrt.2022.03.022
关键词
NiTi shape memory alloy; Stainless steel; Laser welding; Interface; Intermetallic compound
资金
- National Natural Science Foundation of China [51865035, 52175326]
- fund for State Key Laboratory of Advanced Welding and Joining Harbin Institute of Technology [AWJ-22M11]
- Science and Technology Cooperation Special Project of Jiangxi Province [20212BDH81007]
This study investigates the effect of adding a high entropy alloy interlayer on the microstructure and properties of NiTi SMA/304 SS laser-welded joint. The results show that the addition of the high entropy alloy interlayer significantly reduces the formation of brittle intermetallic compounds, improves the tensile shear properties of the joint, and decreases the microhardness of the weld metal.
In order to suppress the formation of Fe-Ti IMCs in NiTi SMA/304 SS laser-welded joint and improve the properties of the joint. In this study, NiTi SMA/304 SS dissimilar alloys joints with and without CoCrFeNiMn high entropy alloy interlayer were obtained by micro laser welding process. The effect of CoCrFeNiMn high entropy alloy interlayer on the microstructure and properties of NiTi SMA/304 SS laser-welded joint was investigated systematically. Results showed that the addition of HEA interlayer significantly reduced the formation of the brittle intermetallic compounds (IMCs) such as FeTi phase. The addition of high entropy alloy interlayer promotes the formation of (Fe,Ni) solid solution phase, therefor, the joint with HEA interlayer is composed of (Fe,Ni) solid solution and small amount of FeTi IMCs and B2 phase. On the other hand, the average microhardness of weld metal was decreased from 732 HV to 221 HV by adding the HEA interlayer. The addition of HEA interlayer significantly improves the tensile shear properties of the joint, and the tensile shear load of the joint can reached 175 N, which is 6 times higher than that of the joint without HEA interlayer.(c) 2022 The Authors. Published by Elsevier B.V. This is an open access article under the CC BY license (http://creativecommons.org/licenses/by/4.0/).
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