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采用等温单向压缩方法研究V-5Cr-5Ti(质量分数,%)合金在温度为1423-1573 K、应变速率为0.01-1 s-1条件下的流变应力和组织演化行为。结果表明,流变应力曲线需进行摩擦力修正,摩擦因数m的测量值为0.45-0.56。采用线性回归方法拟合得到合金的Arrhenius型本构方程,拟合计算应力和实验应力的线性关系,其R2和平均绝对误差值(AARE)分别为0.948和5.44%。表观激活能Qa的取值范围为540-890 k J/mol。连续动态再结晶(CDRX)和不连续动态再结晶(DDRX)机制在热压缩合金中并存。但合金在真应变为1.5的条件下,应变软化的机制仍然以动态回复(DRV)为主。
The isothermal uniaxial compression method was used to study the flow stress and microstructure evolution of V-5Cr-5Ti (mass fraction,%) alloy at temperature of 1423-1573 K and strain rate of 0.01-1 s-1. The results show that the flow stress curves need to be corrected by friction, and the measured value of friction coefficient m is 0.45-0.56. Arrhenius type constitutive equations were fitted by linear regression method, and the linear relationship between calculated stress and experimental stress was fitted. The R2 and average absolute error (AARE) were 0.948 and 5.44% respectively. The apparent activation energy, Qa, ranges from 540 to 890 kJ / mol. Continuous dynamic recrystallization (CDRX) and discontinuous dynamic recrystallization (DDRX) mechanisms coexist in hot-compressed alloys. However, under the true strain of 1.5, the mechanism of strain softening is still dominated by the dynamic response (DRV).