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Abstract：
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The thermal compression tests of bevel gear made of 20CrMnTi steel were conducted under the deformation temperature of 850-1150 ℃ and the strain rate of 0.01-5 s-1 by Gleeble-3500 thermal simulator. Then, the influences of deformation temperature and strain rate on the dynamic recrystallization behavior of 20CrMnTi steel were studied, and the dynamic recrystallization model of 20CrMnTi steel was established. The results show that the dynamic recrystallization volume fraction curves of 20CrMnTi steel under different deformation temperatures and strain rates are “S” type generally, i.e. the dynamic recrystallization volume fraction increases rapidly at the initial stage, and the increasing speed decreases when a critical value is reached. And higher deformation temperature and smaller strain rate are more conducive to the dynamic recrystallization of 20CrMnTi steel. Therefore, the conditions for dynamic recrystallization of 20CrMnTi steel are confirmed by the dynamic recrystallization model, and the 20CrMnTi steel is fully recrystallized in the deformation area by controlling the deformation temperature and the strain rate to achieve the goal of grain refinement and uniform structure as well as improving formability.
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Funds：
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国家自然科学基金资助项目(50901036)；吉林省教科办规划课题（GH170880）
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AuthorIntro：
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张丹（1979-），女，硕士，讲师，E-mail：4380271@qq.com
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Reference：
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