为了研究GH696合金的热变形行为，在880~1120°C、0.01~10 s?1条件下对其进行一系列等温压缩试验，所有试样的变形量为50%。计算各变形条件下的应变速率敏感性指数(m)及应变硬化指数(n)，并分析加工参数对m和n值的影响。结果表明，流变应力随着应变速率的增大及变形温度的降低而增大。m值随变形温度的升高而增大，随应变速率的增大而减小，而 n 值则随着变形温度的升高而减小。此外，建立了 GH696合金热变形过程中的流变应力模型，由模型计算得到的流变应力与实验结果吻合较好。
In order to investigate the hot deformation behavior of superalloy GH696, isothermal compression experiments were carried out at deformation temperatures of 880?1120 °C and strain rates of 0.01?10 s?1. And the deformation amount of all the samples was 50%. The strain rate sensitivity exponent (m) and strain hardening exponent (n) under different deformation conditions were calculated, meanwhile the effects of the processing parameters on the values ofm andn were analyzed. The results show that the flow stress increases with the increase of strain rate and the decrease of deformation temperature. The value ofm increases with the increase of deformation temperature and decreases with the increase of strain rate, while the value ofn decreases with the increase of deformation temperature. A novel flow stress model during hot deformation of superalloy GH696 was also established. And the calculated flow stress of the alloy is in good agreement with the experimental one.
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