摘要:
采用等离子堆焊制备高钒铁基涂层,借助扫描电镜(SEM)、多功能体视显微镜、能谱(EDS)、X-射线衍射(XRD)、硬度计、磨损试验机等分析测试手段,研究等离子堆焊电流对高钒铁基复合堆焊涂层相组成、显微结构、硬度、耐磨性的影响。结果表明:堆焊电流对涂层的显微结构及综合力学性能有较大影响;堆焊涂层主要晶相为马氏体、VC、M7C3型共晶碳化物,弥散分布在马氏体基体中圆粒状的VC和(Fe,Cr,V)7C3共晶碳化物形成涂层的耐磨骨架;在160 A堆焊电流下制备的合金堆焊涂层具有较佳的综合力学性能,表面硬度(HRC)为63.3,磨损量为0.0427 g。
Abstract:
High vanadium Fe-based surfacing coating was prepared by plasma arc surfacing technology. The effects of plasma arc surfacing current on phase composition, microstructure, hardness and wear resistance of high vanadium composite Fe-based surfacing coating were studied by scanning electron microscope（SEM）, multifunctional stereomicroscope, energy spectrum（EDS）, X-ray diffraction（XRD）, hardness tester and wear tester, respectively. The results show that the surfacing current has a great influence on the microstructure and comprehensive mechanical properties of the coating and the main crystalline phases of the surfacing coating are martensite, VC and M7C3-type eutectic carbide. Small spherical VC particles with dispersive distribution in martensite matrix and（Fe, Cr, V）7C3 eutectic carbide form a wear-resistant skeleton. The alloy surfacing coating prepared at 160 A of surfacing current has better comprehensive mechanical properties, with 63.3（HRC） of surface hardness and 0.042 7 g of wear capacity for the surfacing coating.
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