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采用Gleeble-3500热模拟机对GH690-RE合金进行高温压缩变形试验,在温度为950～1200℃,应变速率为0.001～2.000s-1的变形条件下测定并分析其应力-应变曲线。结果表明,流变应力随变形温度的升高和应变速率的降低而降低,且流变应力特征可用经典的双曲正弦模型描述。以应力-应变曲线为基础,采用线性回归法确定了GH690-RE合金的常数,建立了GH690-RE合金的高温本构关系方程。
The Gleeble-3500 thermal simulator was used to carry out high-temperature compression deformation tests on GH690-RE alloy. The stress-strain curves of GH690-RE alloy were measured and analyzed under the deformation of 950 ~ 1200 ℃ and strain rate of 0.001 ~ 2.000s-1. The results show that the flow stress decreases with the increase of deformation temperature and the decrease of strain rate, and the flow stress characteristics can be described by the classical hyperbolic sine model. Based on the stress-strain curve, the constants of GH690-RE alloy were determined by linear regression method, and the constitutive equation of high temperature for GH690-RE alloy was established.