J. Mater. Sci. Technol. ›› 2023, Vol. 163: 158-167.DOI: 10.1016/j.jmst.2023.04.030

• Research Article • Previous Articles     Next Articles

Dissimilar laser welding of CrMnFeCoNi high entropy alloy and 316LN stainless steel for cryogenic application

Jijun Xina, Wei Wanga,*, Xiao Yangb,*, Mebrouka Boubechea, Shanlin Wangc, Hengcheng Zhangb, Chuanjun Huangb, Yong Lib, Bingkun Lyua, Fuzhi Shenb, Wentao Sunb, Laifeng Lib   

  1. aSongshan Lake Materials Laboratory, Dongguan 523808, China;
    bKey Laboratory of Cryogenics, Technical Institute of Physics and Chemistry, Chinese Academy of Sciences, Beijing 100190, China;
    cNanchang Hangkong University, Jiangxi Key Laboratory of Forming and Joining Technology for Aerospace Components, Nanchang 330036, China
  • Received:2023-02-03 Revised:2023-04-04 Accepted:2023-04-09 Published:2023-11-10 Online:2023-03-27
  • Contact: * E-mail addresses: wangwei@sslab.org.cn (W. Wang), yangxiao@mail.ipc.ac.cn (X. Yang).

Abstract: The microstructure and mechanical properties of dissimilar laser beam welded joint between CrMnFeCoNi alloy and 316LN stainless steel was investigated. The results showed that the defect-free dissimilar joint was obtained by laser beam welding. The ultimate strength of the welded joints can reach ∼90% of the base materials at both room and cryogenic temperatures. The deformation substructure mainly consisted of planar dislocation, the stacking faults and the dissociation of stacking faults into nanotwins. The volume fraction of the nanotwins was increasing at cryogenic temperature. The hardness fluctuates greatly in welded joint and the lowest hardness was located at fusion zone near the fusion line. The fracture of the welded joint was located at the fusion zone in consistence with the lowest hardness area. It is mainly attributed to the coarse grain and stress concentration at this area.

Key words: High entropy alloy, Stainless steel, Cryogenic temperature, Microstructure evolution, Mechanical properties