Abstract：The thermal compression experiment of GH984G18 alloy was carried out using thermal-mechanical testing machines Gleeble3800. Based on the stress-strain curves obtained from the experiments, the processing maps of the GH984G18 alloy were established according to the dynamic materials model (DMM), then the hot working process window of alloy was built, and the influence of temperature and strain on the dynamic recrystallization of the experimental alloy was also analyzed. The results show that when the strain is small(ε≤0.2), the optimum deformation temperature is in the temperature range of 1030-1090℃ and strain rate range of 0.01-0.18s-1; with the increase of strain(ε≥0.3), the optimum deformation temperature moves to the high temperature range of 1180-1200℃ and strain rate range of 0.056-0.25s-1; and at the strain rate of 1s-1, dynamic recrystallization does not occur and dynamic recovery dominates when the temperature is lower than 900℃; and partial dynamic recrystallization occurs at the temperature of 1000℃ and the strain of 30%; and then the complete dynamic recrystallization occurs at the temperature of 1000℃ and strain of 60%.
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