铸铁表面堆焊Co基合金的组织和性能研究  

Research on the microstructure and performance of cobalt-based alloy-surfaced cast iron

作　　者：刘蒙[1] 崔立山[1,2] 姜大强[1,2] 蒋小华[1] 郑雁军[1] 高伟[1] 于龙文[3] 

机构地区：[1]中国石油大学(北京) [2]能源材料微结构实验室 [3]辽宁石油化工大学

出　　处：《石油机械》2010年第9期5-6,9,共3页China Petroleum Machinery

基　　金：国家科技重大专项“高含硫气藏安全高效开发技术研究”的子课题“高气密性井下采气工具研究”(2008ZX05017-01-01)

摘　　要：为研制耐高温高压H2S/CO2腐蚀的卡瓦材料,采用表面堆焊方法在HT200灰口铸铁表面堆焊Co基合金,利用光学显微镜、扫描电镜(EDS附件)、X射线衍射仪和硬度计测试分析了堆焊层的组织结构和硬度。分析结果表明,堆焊层组织主要是由树枝状的γ-Co固溶体和共晶组织(γ-Co固溶体+片状M7C3(M=Cr、W、Fe))组成。从堆焊层至基体,硬度降低,堆焊层硬度高达750HV左右,熔合区的硬度大约为380HV,基体硬度为280HV左右。To develop the slip material which is resistant to high temperature,high pressure and H2S/CO2 corrosion,the surfacing overlaying method was adopted to build up cobalt-based alloy on the surface of HT200 grey cast iron,and the microstructure and hardness of the surfacing layer were analyzed by using the optical microscope,scanning electron microscope (EDS accessory),X-ray diffractometer and sclerometer. The analysis indicates that the microstructure of the surfacing layer mainly consists of γ-Co dendritic solid solution and eutectic structure ( γ-Co dendritic solid solution plus flaked M 7C 3 [M=Cr,W and Fe]). The hardness decreases from the surfacing layer to the substrate. The hardness of the surfacing layer reaches as high as 750 HV,that of the fusion zone is about 380 HV and that of the substrate is about 280 HV.

关 键 词：铸铁 CO基合金 堆焊层 显微组织 

分 类 号：TG174.44[金属学及工艺—金属表面处理]