采用熔炼、电渣重熔和气雾化法制备Co8W6Mo5Cr4V3粉末,再通过热等静压制备Co8W6Mo5Cr4V3粉末高速钢。在不同变形条件下进行热压缩实验,研究粉末高速钢的热变形行为,根据获得的应力-应变曲线,建立热变形本构方程,绘制热加工图。结果表明：Co8W6Mo5Cr4V3粉末高速钢的流变应力随变形温度升高或应变速率减小而减小;通过本构方程预测的流变应力和实验得到的流变应力间的相关系数为0.995,可用此方程对粉末高速钢在不同变形条件下的应力进行预测;根据热加工图,粉末高速钢最优的变形温度为1 100~1 150 ℃,应变速率为0.1~1.0 s-1。
Co8W6Mo5Cr4V3 powder was prepared by melting, electroslag remelting, and gas atomization method, then Co8W6Mo5Cr4V3 powder high speed steel was prepared by hot isostatic pressing. Its thermal deformation behavior was studied through hot compression experiments that were conducted on the powder high speed steel under different deformation conditions. Based on the obtained stress-strain curves, a thermal deformation constitutive equation was established and a hot processing map was drawn. The results show that the flow stress of Co8W6Mo5Cr4V3 powder high speed steel decreases with the increase of deformation temperature or the decrease of strain rate. The correlation coefficient between the predicted flow stress through the constitutive equation and the experimental flow stress is 0.995, which can be used to predict the stress of powder high speed steel under different deformation conditions. According to the hot processing map, the optimal deformation temperature and strain rate of powder high speed steel are 1 100-1 150 ℃ and 0.1-1.0 s-1, respectively.
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