Study on characteristics of hot deformation in Super304H austenitic heat-resistant steel
Hot compression test of Super304H austenitic steel was carried out by using a MMS-100 thermal mechanical simulator at 900～1 200℃and 0.1～10 s-1.Based on the true stress-true strain test data,the Zener-Hollomon constitutive model of the studied steel was established by using a strain com-pensation method,and the hot processing maps under a true strain range of 0.02～0.7 was drawn ac-cording to the dynamic material theory.The results show that high temperature and low strain rate are conducive to the occurrence of dynamic recrystallization in Super304H austenitic steel during the hot deformation process.The correlation coefficient and average relative error between the values of flow stress predicted by the constitutive model and experimental values are 0.989 and 7.007％,respectively,reflecting that the established model is relatively accurate and can be used to predict the flow behavior of Super304H austenitic steel under hot compression.Super304H austenitic steel will have a good hot-working stability after deformation reaching a certain degree.The optimal hot working parameter ranges of Super304H austenitic steel determined by the hot processing maps are 1 160～1 200 ℃/0.1～0.55 s-1.
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