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利用等温热压缩实验,研究了TG700C合金变形温度为1050~1250℃、应变速率为1~20 s-1、变形量为60%变形条件下的热变形及动态再结晶行为。对材料高应变速率下的变形热效应进行了温升修正,获得了该合金的流变曲线和热变形本构方程,热变形过程的表观激活能为Q=624.762 k J/mol。该合金经过温升修正后的流变曲线呈现稳态的流变应力,不同变形温度和应变速率下合金的流变应力存在差异。合金的动态再结晶形核方式为应变诱导晶界迁移形核,在高温低应变速率下,动态再结晶形核容易发生,再结晶的比例随着温度的升高和应变速率的降低而提高。
The isothermal hot compression experiment was carried out to study the thermal deformation and dynamic recrystallization of TG700C alloy under the deformation of 1050 ~ 1250 ℃, strain rate of 1 ~ 20 s-1 and deformation of 60%. The temperature dependence of the deformation heat effect at high strain rate was obtained. The rheological curves and thermal deformation constitutive equations of the alloy were obtained. The apparent activation energy of the alloy was Q = 624.762 kJ / mol. The rheological curves of the alloy after temperature rise correction showed steady state flow stress, and the flow stress of the alloy differed at different deformation temperature and strain rate. The dynamic recrystallization nucleation mode is strain-induced grain boundary migration and nucleation. Dynamic recrystallization nucleation easily occurs at high temperature and low strain rate, and the recrystallization ratio increases with the increase of temperature and strain rate.