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.
出处
《华中理工大学学报》
CSCD
北大核心
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
关键词
激光熔覆
钴基合金
微观结构
laser cladding
cobalt-based alloy
microstructure
