为提高碳钢表面抗磨损性能,采用钛铁、钼铁、石墨、铁粉等组分,利用激光熔覆技术,在低碳钢板上制备了致密、无孔隙、与基体呈冶金结合的原位自生TiC-Mo2C颗粒增强Fe基熔覆层。利用金相显微镜,X射线衍射仪(XRD),电子探针微区分析(EPMA)及显微硬度计,研究了熔覆层的显微组织及性能,讨论了强碳化物形成元素对涂层性能的影响。研究结果表明,熔覆层中原位生成了TiC-Mo2C增强颗粒,碳化物呈颗粒状、十字花瓣状均匀地分布在基体中,当钛铁、钼铁和石墨的质量分数分别控制在30%40%,3%6%,3%4%时,涂层具有较好的硬度和良好的耐磨性。

In order to improve the wearing properties of the mild steel,in-situ synthesis of TiC-Mo2C particles reinforced composite coatings has been prepared by laser cladding using ferrotitanium,ferromolybdenum,graphite and iron. The microstructure and properties of the composite coatings were investigated by optical microscopy,X-ray diffractometer (XRD),electron probe microanalyzer (EPMA) and microhardness tester. Results indicate that TiC-Mo2C particles were produced by direct metallurgical reaction between ferrotitanium,ferromolybdenum and graphite during laser cladding process. It was also found that the fine carbides are dispersed in the matrix in form of graininess and petaliform. The hardfacing layer with high hardness and good wear properties could be obtained when the amounts of ferrotitanium,ferromolybdenum and graphite were controlled within a range of 30%40%,3%6%,3%4%,respectively.