摘要
采用常压弧光等离子体在碳钢表面制备高硼Fe-Cr基合金涂层.采用扫描电镜、X射线衍射仪、能谱仪、显微硬度计等对熔覆层的相、组织和显微硬度进行了分析.结果表明,熔覆层中的主晶相是γ-Fe(Ni),Fe2B;熔覆层由大量等边L形、长条状Fe2B初晶相、γ-Fe(Ni)与硼化物的共晶体组成,共晶体呈片层状、菊花状.熔覆层与基体呈冶金结合,界面组织呈扇形共晶、树枝晶等形态.熔覆层的硬度为1100～1400HV0.2,约是基体硬度(290HV0.2)的4倍.靠近熔覆层的基体由于淬火效应硬度提高到600HV0.2左右.
A harden coating of Fe-Cr based alloy,containing high boron,was produced on midium carbon steel plate by plasma cladding process. The phases,microstructures and microhardness of the cladding coating were investigated by Scanning Electron Microscopy (SEM),X-ray Diffractometer (XRD),Energy-dispersive Spectroscopy (EDS) and microhardness tester. The chief phases of the cladding coating are γ-Fe(Ni)and Fe2B. The microstructures of cladding coating were consisted of Fe2B with shapes of equilateral L or lath and eutectic of γ-Fe(Ni)and borides,and the eutectic presented itself with lamella or rosette shape. An excellent metallurgical interface between the coating and the substrate appeared. The microstructures of the layer near the interface exhibit fan-shaped or dendritic structure. The microhardness value of the cladding coating was 1 100-1 400HV0.2 and was about 4 times of the substrate (290HV0.2). The microhardness of the substrate near the interface increased to 600HV0.2 because of quenching.
出处
《焊接学报》
EI
CAS
CSCD
北大核心
2009年第7期65-68,共4页
Transactions of The China Welding Institution
基金
江苏省自然科学基金资助项目(2007180)
关键词
等离子熔覆层
显微组织
显微硬度
45钢
热影响区
plasma cladding coating
microstructure
microhardness
45 steel
heat-affected zone
