Co－Cr－Ni系激光熔覆合金显微结构的研究  

A Study of the Microstructure of Laser-Clad Co-Cr-Ni Alloy

作　　者：黄光晖[1] 曹念荪[1] 王耀科[1] 

机构地区：[1]华中理工大学材料科学与工程系

出　　处：《华中理工大学学报》1995年第12期81-85,共5页Journal of Huazhong University of Science and Technology

基　　金：国家自然科学基金

摘　　要：激光熔覆Ｃｏ－Ｃｒ－Ｎｉ系多元合金的金相、Ｘ射线衍射和电镜研究表明，合金的主要组成相为具有ＦＣＣ点阵的Ｃｏ基固溶体，其中还溶有Ｃｒ，Ｎｉ，Ｆｅ，Ｗ等元素，并存在许多位错和层错；其次是与固溶体组成共晶体的碳化物，主要为具有正交点阵并含有薄片状孪晶的（Ｃｒ，Ｃｏ）＿７Ｃ＿３和Ｃｒ＿７Ｃ＿３．上述亚稳结构在７００℃以下，在一定的应力作用下是稳定的。The microstructure of Co-Cr-Ni alloy containing Fe,wand other elements on the sub- strate of stell 2Cr1 3 by laser cladding has been investigated using the following techniques:metalloscopy,SEM,TEM,electro- extraction of carbides,X-ray diffraction and EDS.Theresults indicate that the alloyin the cladding is of fine dendritic microstructure. The dendritecrystals are cobalt- based solid solution containing elements Cr,Ni,Fe and W.They arewith FCC crystal lattice and crystal defects such as dislocation and stacking fault.Betweenthe dendrites,there exists eutectic consisting of solid solution and carbides,and the eutecticcarbides are predominantly Cr7C3 and(Cr,Co)7C3 with orthorhombic crystal lattice and finetwin substructure. The constituent phases are stable during tempering at temperatures be-low 700℃ and at corrosion fatigue limit(σ=140 MPa).A large amount of carbides, somestrengthening elements and crystal defects in the Co- based solution contribute significantlyto the strengthening and hardening of the clad alloy.

关 键 词：激光熔覆 钴基合金 微观结构 

分 类 号：TG174.44[金属学及工艺—金属表面处理] TG146.16[金属学及工艺—金属学]