铁路用捣镐表面高铬铸铁堆焊层的组织与性能  

Microstructure and Properties of High Chromium Cast Iron Surfacing Layer on Surface of Tamping Tine for Railway

作　　者：厉晓笑[1] 苟国庆[1] 车小莉[1] 陈辉[1] 

机构地区：[1]西南交通大学材料科学与工程学院,成都610031

出　　处：《机械工程材料》2011年第1期58-61,共4页Materials For Mechanical Engineering

基　　金：中央高校基本科研业务费专项基金资助项目(SWJTU09CX046)

摘　　要：采用不同高铬铸铁堆焊焊条对失效的捣镐进行表面堆焊修复,通过显微组织观察、硬度测试和冲击磨损试验对堆焊层的组织和性能进行了研究,并与新镐进行了对比分析。结果表明:堆焊层组织主要为初生碳化物(Cr,Fe)7C3和共晶组织,从表面到底部,初生碳化物的含量逐渐减少,主要呈六角或长条状;堆焊层的硬度和耐磨性较新镐的好,其中JD2焊条堆焊层的性能要优于JD1焊条的。Different high chromium cast iron surfacing electrodes were used for surfacing repair of the failed tamping tine.Microstructure observation,hardness test and impact wear test were carried out to investigate the microstructure and properties of the surfacing layers,and the results were compared with those of a new tamping tine.The results show that the main microstructure was primary carbide（Cr,Fe）7C3 and eutectic structure.The carbides were hexagon or strip,whose content decreased from the surface to the bottom.The surfacing layer had better hardness and wear resistance than the new tamping tine,while the properties of the layer with JD2 electrode were better than those of the layer with JD1 electrode.

关 键 词：捣镐 堆焊 冲击磨粒磨损 初生碳化物 共晶组织 

分 类 号：TG146.1[一般工业技术—材料科学与工程]