等离子熔覆含亚微米碳化铌铁基耐磨合金组织与性能的研究  

Microstructure and Properties of Plasma Cladding Fe-based Wear-resisting Alloy Containing Submicron NbC

作　　者：王智慧[1] 赵雪飞[1] 贺定勇[1] 蒋建敏[1] 赵秋颖[2] 刘飞[1] 

机构地区：[1]北京工业大学材料科学与工程学院,北京100124 [2]北京工业大学机械工程博士后流动站,北京100124

出　　处：《材料工程》2015年第7期73-79,共7页Journal of Materials Engineering

基　　金：国家自然科学基金资助项目(51275010);北京市教育委员会资助项目(PXM2013_014204_07_000271)

摘　　要：采用等离子熔覆(PTA)在Q235钢上制备含亚微米碳化铌Fe-Cr-B-C-Nb熔覆层,通过改变合金成分,分别设计含超细碳化铌、含共晶硼化物、含超细碳化铌+共晶硼化物、含超细碳化铌+初生Fe2B硬质相的熔覆层,研究不同尺寸硬质相对Fe-Cr-B-C-Nb熔覆层组织与性能的影响,并与市售常用Fe-Cr-C耐磨材料对比。结果表明:细小硬质相有助于改善合金冲击变形能力,含亚微米碳化铌和共晶硼化物的合金具有优良的综合性能,耐磨性为Fe-Cr-C耐磨材料的4倍多,且冲击变形能力优于Fe-Cr-C耐磨材料。Fe-Cr-B-C-Nb cladding layer containing submicron NbC were prepared by PTA on Q235 steel,a series of alloys containing superfine NbC,eutectic boride,NbC ＋eutectic boride,NbC＋primary Fe2 B hardphase were designed respectively to study the effect of hardphase of different size on microstructure and properties of Fe-Cr-B-C-Nb cladding layer,and compared with the Fe-Cr-C hardfacing alloy in market.The results show that the fine hardphase can conduce to improve the impact resistance and the wear resistance of the alloy containing submicron NbC and eutectic boride is 4times more than that of Fe-Cr-C,and the impact resistance is better than that of Fe-Cr-C.

关 键 词：碳化铌 等离子熔覆(PTA) 亚微米 耐冲击性 

分 类 号：TG174.442[金属学及工艺—金属表面处理]