Q235钢氩弧熔覆铁基合金涂层的耐磨性研究

Investigation on Wear Resistance of Fe-based Alloy Coating Prepared by Argon Arc Cladding on Q235

利用氩弧熔覆技术,选择合适的工艺参数,在Q235钢材表面熔覆了铁基合金耐磨涂层。通过金相显微镜和SEM分析了熔覆涂层的显微组织,并测试了涂层的显微硬度和耐磨性。结果表明,在Q235钢表面制备了以马氏体组织和γ-(Fe-Cr-Ni-C)合金固溶体为基体,以(Cr,Fe)7C3、Fe3C、Fe2B等化合物为增强相的合金涂层;涂层的显微硬度可达600 HV;涂层的耐磨性较基体提高近8倍。在低碳钢表面熔覆一层耐磨材料,既保留了低碳钢较高的塑、韧性,又提高了表面层的硬度和耐磨性。

By plasma cladding technology, a wear resistant coating with Fe-based alloy was prepared on the surface of Q235 steel. The microstructure of the bonding coating was investigated by optical microscope and scanning electron microscope. The microhardness and wear resistance performance of the coating was tested. The results show that the alloy coating on the surface of Q235 is conposed of the matrix of martensitic structure and y- （Fe-Cr-Ni-C） alloy solid solution,and the reinforcing phases of （Cr, Fe）7CJFe3C/Fe2B and other compounds. The microhardness of the coating can reach 600 HV and the wear resistance is about 8 times higher than that of Q235 steel substrate. When deposited a wear-resistant layer on the surface of mild steel, the high plasticity and ductility of mild steel can be preserved, and the hardness and wear resistance of the cladding layer can also be improved greatly.