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采用粉末冶金工艺制备了三种不同Co和Cr3C2含量的硬质合金材料。在常温下分别测量了材料的晶粒度、硬度和抗弯强度,并通过SEM照片等对材料的金相显微组织、断口形貌进行分析。结果表明:硬质合金中粘结相Co含量增多,其硬度下降,抗弯强度升高;微量碳化物Cr3C2在硬质合金中起到细化晶粒的作用,在高钴硬质合金中添加微量碳化物Cr3C2,能使材料具有高硬度、高抗弯强度的良好综合性能。
Three kinds of cemented carbide materials with different contents of Co and Cr3C2 were prepared by powder metallurgy. The grain size, hardness and flexural strength were measured respectively at room temperature. The microstructure and fracture morphology of the material were analyzed by SEM photographs. The results show that the content of Co in the cemented carbide increases, the hardness decreases, and the bending strength increases. The carbides Cr3C2 plays a role of grain refinement in the cemented carbide and is added to the high-cobalt cemented carbide Cr3C2 trace carbides, can make the material with high hardness, high bending strength of a good overall performance.