【摘要】 在 4 5钢表面进行W、Mo、Ti离子三元共渗 ,以形成类似高速钢成分的合金化渗层 ;对该合金化渗层进行渗碳、淬火、回火处理。结果表明 ,离子渗金属后 ,渗层组织为合金铁素体 ,表面合金元素浓度 (质量分数 ,% )为 8W、10Mo、1 8Ti;渗层经渗碳后 ,显微组织为粒状合金珠光体 +不同形状的合金碳化物 ,合金碳化物的分布与普通高速钢相比更为细小、弥散、均匀 ;渗碳试样经淬火、回火处理后 ,渗层显微组织为回火马氏体和均匀细小的粒状碳化物 ,合金碳化物为M6 C(Fe3W3C)、M7C3[(FeWMo) 7C3]和MC(TiC、γ MoC) ,硬度为 80 0～ 890HV0 1(相当于 6 4～6 7HRC) ,红硬性为 76 0HV0 1左右 (相当于 6 3HRC)。更多还原

【Abstract】 The alloying layer that elements content is similar to HSS were preparated on the surface of 45 steel specimens,by the double golw plasma W-Mo-Ti alloying.Then the specimens were carburized,quenched and tempered.The results show that the microstructure of the alloying layer consist of the alloying ferrite,and the composition of the alloy elements is 8%（wt）W,10%（wt）Mo,1.8%（wt）Ti.After carburizing of the alloying layer,the microstuctures of the alloying layer consist of the uniform and fine granular pearlite.After the carburizing specimens quenched and tempered,the microstructure of the alloying layer consist of tempered martensite and the fine carbides which are M₆C（Fe₃W₃C）、M₇C₃[（FeWMo）₇C₃],and MC（TiC、γ-MoC）,the carbides is smaller and more uniform,the hardness of the alloying layer is 800～890HV0.1 and the red hardness is 760HV0.1.更多还原