中文摘要：

铁基Fe-Cr-Mo-C-B非晶合金具有高耐腐蚀性能和高硬度的特点,因而非常适合应用于表面及涂层材料,其较高的非晶形成能力使得采用激光表面处理技术获得理想非晶表面成为可能.采用激光表面熔化技术成功实现了Fe-Cr-Mo-C-B合金的表面非晶化,研究了激光表面熔化工艺参数对合金表面非晶化的影响并建立了最佳工艺.发现合金经激光表面熔化处理后形成了从表面到基体的非晶层、非晶-晶体复合层和晶态基体的多层次结构,并探讨了其形成机理及与腐蚀行为和硬度的相关性.研究表明：Fe-Cr-Mo-C-B合金的硬度和腐蚀行为等表面性能显著依赖于其微观结构,激光表面熔化所获得的非晶表层表现出高硬度和优异的耐腐蚀性能.研究结果也为采用激光表面熔覆技术在其他金属材料表面制备具有实际应用价值的耐腐蚀、耐磨损Fe-Cr-Mo-C-B非晶合金涂层奠定了一定的理论和实验基础.

英文摘要：

Iron-based Fe-Cr-Mo-C-B metallic glasses with high corrosion resistance and hardness are suitable to be used as surface and coating materials,and their high glassy-forming ability makes it possible to synthesize amorphous surface layer by laser surface treatment.In this paper,surface vitrification of a Fe-Cr-Mo-C-B alloy was successfully achieved by laser surface melting.The effect of laser surface melting parameters on the surface vitrification was studied,and the optimum process was established for the Fe-Cr-Mo-C-B alloy.It was found that after the LSM treatment,multilayer structure consisting of amorphous layer,amorphous-crystalline layer and crystalline substrate from alloy surface to substrate was formed,and the mechanism was discussed.Investigations on corrosion behavior and hardness of the laser surface treated Fe-Cr-Mo-C-B alloy indicate that these properties significantly depend on the microstructure,and the amorphous surface layer exhibits high hardness and outstanding corrosion resistance.This study also provides theoretical and experimental foundation for preparing corrosion-and wear-resistant Fe-Cr-Mo-C-B amorphous coating on other metallic materials using laser surface cladding technology.