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在Gleeble热模拟机上对GH625合金进行了等温热压缩试验,获得了不同变形条件下该合金的真应力-真应变曲线,并对热压缩试样的微观组织进行了分析。通过对实验数据的计算,获得了GH625合金发生动态再结晶所需的临界变形量与变形温度和应变速率的函数关系;建立了合金动态再结晶的运动学方程,用该方程预测的动态再结晶体积分数与实测值吻合较好,误差的平均值为13%;构建了GH625合金的晶粒长大模型,用该模型预测的晶粒尺寸值与实测值之间的误差平均值为7.52%。GH625合金动态再结晶的形核方式主要为晶界弓出形核和亚晶合并长大形核。
The isothermal hot compression test of GH625 alloy was carried out on a Gleeble simulator. The true stress-true strain curve of the alloy under different deformation conditions was obtained. The microstructure of the hot-compressed specimen was also analyzed. Through the calculation of experimental data, the critical deformation of GH625 alloy is obtained as a function of deformation temperature and strain rate. The kinematic equation of dynamic recrystallization of alloy is established. The dynamic recrystallization The integral value is in good agreement with the measured value, and the average value of the error is 13%. The grain growth model of GH625 alloy is constructed. The average error between the predicted grain size and the measured value is 7.52%. The nucleation modes of dynamic recrystallization of GH625 alloy mainly consist of nucleation and subgrain nucleation combined with growth and nucleation.