激光熔覆原位自生TiC-VC颗粒增强Fe基金属陶瓷涂层

In situ synthesis of TiC-VC particles reinforced Fe-based metal matrix composite coating by laser cladding

摘要: 采用钛铁、钒铁、石墨等组分,利用5 kW横流CO₂激光器,氩气保护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-VC复合碳化物颗粒增强Fe基熔覆层。利用金相显微镜、X射线衍射、电子探针及显微硬度计,研究了熔覆层的显微组织及性能。结果表明,钛铁、钒铁与石墨通过激光熔覆的反应,所得细小的TiC-VC复合碳化物增强相弥散分布Fe基体之中,熔覆层硬度从基体到表面呈梯度分布,较基体有显著提高。

Abstract: Using a 5 kW CO₂ laser, in situ synthesized TiCVC particles reinforced Fe-based alloy composite coating was prepared by preplaced ferrotitanium, ferrovanadium and graphite etc. The microstructure and properties of the composite coatings were investigated by optical microscope, X-ray diffractometer, electron probe microanalyzer and microhardness tester.Results indicated that TiC-VC particles are produced by direct metallurgical reaction among ferrotitanium, ferrovanadium and graphite during laser cladding process. It was also found that fine TiC-VC particles are dispersed in the matrix.The microhardness of the coatings, which was enhanced by the TiC-VC particles, was much greater than that of the Q235 substrate.