铸铁表面等离子熔覆Fe-Cr-Si-B涂层的组织特征  

Microstructure of Fe-Cr-Si-B coating prepared by plasma cladding on cast iron

作　　者：彭竹琴[1] 卢金斌[1] 吴玉萍[2] 张照军[1] 

机构地区：[1]中原工学院材料与化学工程系,河南郑州450007 [2]河海大学材料科学与工程学院,江苏南京210098

出　　处：《材料热处理学报》2008年第1期124-127,共4页Transactions of Materials and Heat Treatment

基　　金：江苏省自然基金项目(BK2004117)

摘　　要：利用常压弧光等离子体在铸铁表面熔覆Fe—Cr-Si—B合金粉末制备耐磨涂层，采用金相显微镜、扫描电镜、X射线衍射仪、显微硬度计对熔覆层的组织和性能进行了分析。结果表明，熔覆层组织主要由近似于六方形、U形、L形或H形的初生（Cr，Fe）7C3相及短杆状或小块状（Cr，Fe）7C3共晶碳化物、α-（Fe，Cr）和Fe3C组成；熔覆层与基体界面形成细小的共晶莱氏体组织，在界面处熔覆层与基体中的合金元素发生了相互扩散，形成具有冶金结合的涂层；熔覆层显微硬度可达600～1200HV0．2。A wear-resistant coating was prepared on cast iron using Fe-Cr-Si-B elemental powder blends by plasma cladding. The microstructure and properties of the coating were investigated by optical microscope （OM）, scanning electron microscopy （SEM） with energy dispersive spectroscopy （EDS）, X-Ray diffractometer （XRD） and microhardness tester. The results show that the microstructure of the clad layer consists of primary phase of （ Cr, Fe）7 C3 , eutectic carbide （ Cr, Fe）7 C3 , α- （ Fe, Cr） solid solution and Fe3 C. Primary phase （ Cr, Fe）7 C3 exhibits hexagon, U, L or H shape and eutectic carbide （Cr, Fe）7C3 presents the shape of short bar or small block. The fine eutectic ledeburite is formed at the interface between cladding and substrate. Alloy elements in cladding and substrate near the interface diffuse each other to produce the coating with metallurgically bonded to substrate. The microhardness of the clad layer reachs 600 - 1200HV0.2.

关 键 词：等离子熔覆 铸铁 组织 显微硬度 

分 类 号：TG143[一般工业技术—材料科学与工程]