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使用热模拟试验机在变形温度为950℃—1150℃,变形速率为0.01s-1—10s-1、总应变为0.7的条件下对喷射成形M4高速钢进行热压缩变形,建立了热变形本构方程并计算了热变形激活能。同时,对不同状态沉积态合金的组织进行了表征。结果表明,沉积态M4高速钢晶粒细小、均匀,无宏观偏析;热变形时表现出显著的动态再结晶特征,且变形温度和应变速率对合金流变应力影响显著;变形温度对碳化物的形貌和分布也有较大的影响。
The hot deformation test was carried out on the hot-deformed M4 high speed steel with the deformation temperature of 950 ℃ -1150 ℃, the deformation rate of 0.01s-1-10s-1 and the total strain of 0.7. Constitute the equation and calculate the thermal deformation activation energy. Meanwhile, the microstructures of the as-deposited alloys in different states were characterized. The results show that the grain size of the deposited M4 high speed steel is small, uniform and without macroscopic segregation. The dynamic recrystallization characteristics of the M4 high speed steel during hot deformation show remarkable dynamic recrystallization. The deformation temperature and strain rate have significant influence on the flow stress of the alloy. Topography and distribution also have a greater impact.