等离子原位合成陶瓷相增强铁基堆焊层  

In situ formation ceramic phase reinforced Fe-based alloy composite coating by PTA

作　　者：宗琳[1,2] 刘政军[2] 

机构地区：[1]沈阳化工大学机械工程学院,辽宁沈阳110142 [2]沈阳工业大学材料科学与工程学院,辽宁沈阳110178

出　　处：《焊接技术》2012年第6期8-10,1,共3页Welding Technology

基　　金：辽宁省教育厅资助项目(L2010433)

摘　　要：采用等离子堆焊技术,在碳钢基体表面预涂一定混合比例的高碳铬铁、钒铁和石墨,制备原位自生陶瓷相增强铁基堆焊层,并对堆焊层的组织和性能进行测试。结果表明:堆焊层与基体之间形成良好的冶金结合,堆焊层微观组织由马氏体、少量残余奥氏体、(Fe,Cr,V)7C3和VC构成。初生(Fe,Cr,V)7C3呈六边形,晶粒尺寸较大,均匀弥散分布在熔覆层中,VC颗粒呈团聚状或球状,晶粒较细小。堆焊层硬度从基体到表面呈合理的梯度分布,使材料具有较好的耐磨性。The in-situ ceramic phases reinforced Fe-based composites coating had been produced by prepared high-carbon ferro chromium,ferrovanadium and graphite power on carbon steel through plasma transferred arc weld-surfacing process(PTA).The microstructure and properties were investigated by means of optical microscopy(op),scanning electron microscopy(SEM),X-ray diffraction(XRD)and microhardness meter.The results showed that the substrate and the coating formed good metallurgical bonding.The microstructure of coating consisted of martensite,ferrite and residual austenitic,(Fe,Cr,V)7C3 and VC.The primary hexagonal(Fe,Cr,V)7C3 with larger size presented dispersively and evenly distributed in coating,the fine VC particles were irregular shape or globular.The microhardness appeared reasonable distribution from substrate to the top,which ensured that the materials had good abrasive wear resistance.

关 键 词：等离子堆焊 陶瓷相 显微组织 显微硬度 

分 类 号：TG456.2[金属学及工艺—焊接]