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 obtai...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.展开更多
基金the National Natural Science Foundation of China(Nos.52071223,52007186)National Key Research and Development Program of China(Nos.2022YFA1603904,2022YFB3804003)+6 种基金Guangdong Basic and Applied Basic Research Foundation(Nos.2020B1515120084,2021A1515110299)Guangdong Province Youth Top Talent Program(No.2021TQ06C118)Key-Area Research and Development Program of Guangdong Province(No.2020B0101340002)Key Program of the Chinese Academy of Sciences(No.ZDRW-CN-2021-2-4-1)Scientific Instrument Developing Project of Chinese Academy of Sciences(No.YJKYYQ20200070)Open Research Fund of Songshan Lake Materials Laboratory(No.2022SLABFN22)Inner Mongolia Science and Technology Major Project(No.2020ZD0011).
文摘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.
