In-situ Synthesis of Ceramic Phase Reinforced Fe-Based Alloy Surface Coating by PTA

摘要

The in-situ ceramic phases reinforced Fe-based surface coating had been produced by prepared high-carbon ferrochromium, ferrovanadium and graphite power on 20g 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 consists of primary M_7C_3 carbide and eutectic structures[M+γ'+M_7C_3+VC]. The primary hexagonal (Fe,Cr,V)_7C_3 with larger size evenly distributed in coating and the fine VC particles were globular shape. The microhardness appeared reasonable distribution from substrate to the top, which ensured that the materials had good abrasive wear resistance.