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用M42和YG20C质量比为2∶1的混合粉末,利用放电等离子烧结技术制备了YG20C/Cr12MoV双金属复合材料,并对过渡层与Cr12MoV、YG20C两侧界面的微观组织、元素扩散及显微硬度进行了分析。结果表明,Cr12MoV钢内表面有一层宽度约为60μm的晶粒异常长大区,其硬度较低,对复合材料的连接性能产生不利影响;SPS烧结过程中,粉末颗粒之间的火花放电使Cr12MoV钢表层产生高温是造成晶粒异常长大、脱碳和贫Cr的主要原因;过渡层与Cr12MoV、YG20C界面过渡区宽度分别约为60μm和40μm,两界面处元素发生扩散,显微硬度呈梯度增加,连接性能良好。
The YG20C / Cr12MoV bimetallic composite was prepared by spark plasma sintering with mixed powder of M42 and YG20C mass ratio of 2:1. The microstructure, elemental diffusion and microhardness of the interface between the transitional layer and Cr12MoV and YG20C were also studied. Analyzed. The results show that the inner surface of Cr12MoV steel has an abnormal grain growth zone with a width of about 60μm, which has a low hardness and adversely affects the connection properties of the composite material. In the SPS sintering process, the spark discharge between the powder particles causes Cr12MoV The main cause of abnormal grain growth, decarburization and Cr depletion is the high temperature of the steel surface. The transitional zone between the transitional layer and Cr12MoV and YG20C is about 60μm and 40μm, respectively. The elements diffuse at the interface and the microhardness is gradient Increase, the connection performance is good.