Regulating microstructure and mechanical property of dissimilar joints by pretreatments of S31042 steel and Ni3Al-based superalloy bonding substrates  

作　　者：Yuan-yi Peng Chong Li Qian-ying Guo Hui-jun Li Yong-chang Liu 

机构地区：[1]State Key Lab of Hydraulic Engineering Simulation and Safety,School of Materials Science and Engineering,Tianjin University,Tianjin,300354,China

出　　处：《Journal of Iron and Steel Research International》2023年第11期2328-2339,共12页

基　　金：supported by the National Natural Science Foundation of China(Grant Nos.52034004 and 52075373).

摘　　要：For the bonding couple of S31042 steel and Ni3Al-based superalloy,joint microstructure regulation plays a pivotal role in improving joint performance.Different pretreatment approaches including solution and cold rolling treatments were severally applied to the two substrates before vacuum diffusion bonding.Cold rolling treatment in S31042 steel substrate before bonding promoted the coarsening and precipitation behaviors of large amounts of Z(NbCrN)phases during the bonding process so that the AlN phase decreased in the joint area because of the consumption of N atom in the Z phase.And solution treatment for Ni3Al-based superalloy increased the grain boundary mobility and led to the occurrence of dynamic recrystallization in the diffusion area of the joint by reducing segregation and homogenizing the microstructure within the substrate.As a result,the bonded sample with two substrates that are pretreated exhibited a better tensile strength and elongation at 700℃.

关 键 词：Ni3Al-based superalloy STEEL Joint Pretreatment Diffusion bonding 

分 类 号：TG14[一般工业技术—材料科学与工程]