Co和Cr_3C_2对硬质合金组织和性能的影响

Effects of Co and Cr_3C_2 on the Microstructure and Properties of Cemented Carbide

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 Co and Cr3C2 content were prepared by powder metallurgy. The crystal grain size, hardness and bending strength of the materials were measured at room temperature. Metallographic microstructure and fracture morphology of the materials were observed under SEM. The results show that with the content of binder phase Co in cemented carbide increasing, the hardness of the material decreases, but the bending strength increases. Trace Cr3 Cz in the cemented carbide can refine crystal grain,and adding trace CraC2 into high-Co-content cemented carbide is a good way to ob- tain the material with excellent comprehensive performance of high hardness and high bending strength.