Performance and microstructure of TC4/Nb/Cu/316L welded joints subjected to cryogenic treatment

摘要

? 2022 Elsevier B.V.The diffusion welded joints of 316L/TC4 with Nb/Cu metal interlayer were subjected to cryogenic treatment. After cryogenic treatment, the strength of joints increased with the increase of soaking time. The strength of joints decreased with the increase of the cycle impact times. The average tensile strength of as-welded joints (AW) was 236.7 MPa, and the cryogenic treated samples for 24 h reached the best (280 MPa). The bonding mechanism of TC4/Nb/Cu/316L vacuum diffusion bonding joints and the influence mechanism of cryogenic treatment were analyzed.