首页|Revealing microstructural evolution and mechanical properties of resistance spot welded NiTi-stainless steel with Ni or Nb interlayer

Revealing microstructural evolution and mechanical properties of resistance spot welded NiTi-stainless steel with Ni or Nb interlayer

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Dissimilar welding of NiTi and stainless steel(SS)for multifunctional device fabrication is challenging due to the brittle nature of intermetallic compounds(IMCs)that are formed in the weld zone.In this work,Ni and Nb interlayers were applied for the resistance spot welding(RSW)of NiTi and SS to replace the harmful Fe2Ti phase and to restrict the mixing of dissimilar molten metals,respectively.Microstructural evolution and mechanical properties of the joints were investigated.It was shown that a conventional weld nugget was created in the absence of any interlayer in the welded joint suffering from traversed cracks due to the formation of brittle IMCs network in the fusion zone(FZ).By the addition of Ni from the interlayer,Fe2Ti dominated weld nugget was efficaciously replaced by Ni3Ti phase;however,the presence of the large pore and cracks reduced the effective joining area.The use of a Nb interlayer resulted in a fundamentally different joint,in which FZs at NiTi and SS sides separated by the unmolten Nb would suppress the mixing of dissimilar molten metals.Nb-containing eutectic structures with low brittleness formed at the interfaces,contributing to the enhancement of joint strength(increased by 38％on fracture load and 460％on energy absorption).A high-melting-point interlayer showed great potential to realize a reliable and high-performing RSWed NiTi-SS joint.

NiTiStainless steelResistance spot weldingIntermetallic compoundsMechanical properties

K.Zhang、A.Shamsolhodaei、A.Ghatei-Kalashami、J.P.Oliveira、C.Zang、N.Schell、J.Li、A.R.H.Midawi、J.G.Lopes、J.Yan、P.E.J.Rivera-Díaz-del-Castillo、P.Peng、Y.N.Zhou

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Department of Mechanical and Mechatronics Engineering,University of Waterloo,200 University Avenue West,Waterloo,ON,N2L 3G1,Canada

CENIMAT/I3N,Department of Materials Science,NOVA School of Science and Technology,Universidade NOVA de Lisboa,2829-516,Caparica,Portugal

Materials Research Group,Department of Mechanical Engineering,University of Southampton,Southampton,SO17 1BJ,UK

Helmholtz-Zentrum Hereon,Institute of Materials Physics,Max-Planck-Str.1,Geesthacht,21502,Germany

UNIDEMI,Department of Mechanical and Industrial Engineering,NOVA School of Science and Technology,Universidade NOVA de Lisboa,2829-516,Caparica,Portugal

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加拿大自然科学与工程研究委员会项目Canada Research Chairs(CRC)国家留学基金national funds from FCT-Funda??o para a Ciência e a Tecnologiascope of the projectsscope of the projectsscope of the projectsAssociate Laboratory Institute of Nanostructures,Nanomodelling and Nanofabricationi3NHelmholtz Association HGF,for the provision of experimental facilities

LA/P/0037/2020UIDP/50025/2020UIDB/50025/2020

2024

10.1016/j.jmst.2023.05.057

材料科学技术(英文版)
中国金属学会 中国材料研究学会 中国科学院金属研究所

材料科学技术(英文版)

CSTPCD
影响因子：0.657
ISSN：1005-0302
年,卷(期)：2024.180(13)
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