分别以硼铁和B4C作为供硼剂,添加适量的供氮剂、供硫剂以及填充剂,采用粉末包埋法在20CrMo渗碳钢表面制备了渗硼层和渗硼氮硫层,分析了两类渗层的物相组成、硬度和磨损性能.结果表明:渗硼层均由Fe2B、FeB、Fe3C相组成,渗硼氮硫层则由Fe2B、Fe3N、FeS、Fe3C相组成,未形成脆性FeB相;渗硼层和渗硼氮硫层的表面硬度、耐磨粒磨损和耐黏着磨损性能均高于渗碳钢的,且渗硼层的硬度和耐磨粒磨损性能高于渗硼氮硫层的,而耐黏着磨损性能低于渗硼氮硫层的;以硼铁为供硼剂制备的渗硼层的耐磨粒磨损性能优于以碳化硼为供硼剂的,而耐黏着磨损性能低于以碳化硼为供硼剂制备的.
Using ferroboron and B4C as a boron source respectively and adding moderate nitrogen source, sulphur source and fillers, the boriding layers and sulfur nitrogen boriding layers on the surface of 20CrMo carburized steel were prepared by the powder embedding method, and then the phase composition, hardness and wear resistance of the two layers were analyzed.The results show that the boriding layers were both composed of Fe2B, FeB and Fe3C phases while the sulfur nitrogen boriding layers were composed of Fe2B, Fe3N, FeS and Fe3C phases without the formation of brittle FeB phase.The surface hardness, abrasive and adhesive wear resistance of the boriding layers and the sulfur nitrogen boriding layers were all higher than those of the carburizing layer.Moreover, the surface hardness and abrasive wear resistance of the boriding layers were higher while the adhesive wear resistance was lower than those of the sulfur nitrogen boriding layers.The abrasive wear resistance of the boriding layers prepared with ferroboron as a boron source was higher while the adhesive wear resistance was lower than those with B4C as a boron source.
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