放电等离子烧结42CrMo钢/黄铜双金属复合接头的显微组织  

Microstructure of 42CrMo Steel/Brass Bimetallic Composite Joint by Spark Plasma Sintering

作　　者：冯超[1] 姜超平[1] 鲍建东 吕志甲 鲍明东[3] 徐雪波[3] 张贵锋[2] FENG Chao;JIANG Chaoping;BAO Jiandong;LU Zhijia;BAO Mingdong;XU Xuebo;ZHANG Guifeng(School of Materials Science and Engineering, Chang＇an University, Xi＇an 710061, China;3.School of Materials Science and Engineering, Xi＇an Jiaotong University, Xi＇an 710049, Chin;2.School of Materials and Chemical Engineering, Ningbo University of Technology, Ningbo 315211, China)

机构地区：[1]长安大学材料科学与工程学院,西安710061 [2]西安交通大学材料科学与工程学院,西安710049 [3]宁波工程学院材料与化学工程学院,宁波315211

出　　处：《机械工程材料》2018年第4期22-26,共5页Materials For Mechanical Engineering

摘　　要：采用放电等离子烧结技术对42CrMo钢和黄铜进行连接,研究了接头的显微组织、成分和硬度分布,分析了其接头组织形成过程。结果表明:在42CrMo钢和黄铜之间存在一个宽10~20μm的过渡层,过渡层组织均匀细密;在近过渡层的黄铜中存在一个宽约70μm的岛状组织区,这些岛状组织主要为铁的固溶体;在较高压力下,接头中不存在缝隙,但存在少数孔隙;接头的截面硬度呈梯度变化;铁元素扩散深度达到90μm,铜元素扩散不太明显,42CrMo钢和黄铜之间为扩散连接。42 CrMo steel and brass were joined by spark plasma sintering technique.The microstructure,composition and hardness distribution of the joint were studied,and the joint microstructure formation process was analyzed.The results show that a transition layer with width of 10-20μm existed between the 42 CrMo steel and the brass.The microstructure of the transition layer was uniform and fine.In the brass near the transition layer,the island-like structure zone with width of about 70μm was observed.These island-like structures mainly consisted of solid solution of iron.Under a relatively high pressure,no cracks but a few voids were observed in the joint.The microhardness on cross-section of the joint showed a change of gradient.The diffusion depth of iron reached 90μm,but the diffusion of copper was not obvious.The 42 CrMo steel and brass had a diffusion bonding.

关 键 词：42CRMO钢 黄铜 放电等离子烧结 扩散 显微组织 

分 类 号：TG401[金属学及工艺—焊接]