Abstract
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 of m and n were analyzed. The results show that the flow stress increases with the increase of strain rate and the decrease of deformation temperature. The value of m increases with the increase of deformation temperature and decreases with the increase of strain rate, while the value of n 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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