在Gleeble-1500D热模拟机上采用等温压缩实验研究GH625合金的高温压缩变形行为,获得合金在温度为1 000～1 200 ℃、应变速率为10-2～10 s-1的条件下的真应力-应变曲线,并在考虑摩擦和变形热效应的基础上对真应力-应变曲线进行修正.对修正后的峰值应力进行线性回归,得到合金的高温材料常数:Q=635.38 kJ/mol, α=0.008 404 MPa-1, n=3.52.通过非线性回归建立GH625合金包含应变量的高温变形本构模型.在应变速率为0.1 s-1时,随着热变形温度的升高,合金发生动态再结晶的体积分数随之增加,在1 000～1 100 ℃发生部分动态再结晶,当温度达到1 200 ℃时,发生完全动态再结晶,此时平均晶粒尺寸约为22.21 μm.
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