标题：Microstructure and Shear Strength in Brazing Joint of Mo-Cu Composite with 304 Stainless Steel by Ni-Cr-P Filler Metal
作者：Wang, Juan;Wang, Jiteng;Li, Yajiang;Zheng, Deshuang
作者机构：[Wang, J] Key Laboratory for Liquid-Solid Structural Evolution and Processing of Materials, Ministry of Education, Shandong University, Shandong, Chin 更多
通讯作者地址：[Wang, J]Shandong Univ, Minist Educ, Key Lab Liquid Solid Struct Evolut & Proc Mat, Shandong, Peoples R China.
来源：HIGH TEMPERATURE MATERIALS AND PROCESSES
关键词：mo-Cu composite;Ni-Cr-P filler metal;vacuum brazing;microstructure
摘要：The brazing of Mo-Cu composite and 304 stainless steel was carried out in vacuum with Ni-Cr-P filler metal at 980 degrees C for 20 min. Microstructure in Mo-Cu/304 stainless steel joint was investigated by field-emission scanning electron microscope (FE-SEM) with energy dispersive spectrometer (EDS) and shear strength was measured by shearing test. The results indicate that shear strength of the Mo-Cu/304 stainless steel joint is about 155 MPa. There forms eutectic structure of gamma-Ni solid solution with Ni3P in the braze seam. Ni-Cu(Mo) and Ni-Fe solid solution are at the interface beside Mo-Cu composite and 304 stainless steel, respectively. Shear fracture exhibits mixed ductile-brittle fracture feature with trans-granular fracture, ductile dimples and tearing edges. Fracture originates from the interface between brazing seam and Mo-Cu composite and it propagates to the braze seam due to the formation of brittle Ni5P2 and Cr3P precipitation.