Hot deformation behavior of Co8W6Mo5Cr4V3 powder high speed steel
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.
Co8W6Mo5Cr4V3powder high speed steelthermal deformationconstitutive equationhot processing map
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