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摘要：
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采用Gleeble-3500热模拟试验机，对20CrMnTi钢伞齿轮进行了变形温度为850~1150 ℃、应变速率为0.01~5 s-1的热压缩试验，研究了变形温度和应变速率对20CrMnTi钢动态再结晶行为的影响，建立了20CrMnTi钢动态再结晶模型。结果表明：不同变形温度和应变速率下，20CrMnTi钢的动态再结晶体积分数曲线都大体呈“S”型，即初始阶段动态再结晶体积分数增加速度较快，而在到达某一临界值时增加速度变小；较高的变形温度和较小的应变速率更加有利于20CrMnTi钢发生动态再结晶。通过动态再结晶模型可以确定20CrMnTi钢发生动态再结晶的条件，从而可以通过控制变形温度和应变速率使20CrMnTi钢在变形区域发生充分再结晶，实现细化晶粒、均匀组织和提高成形性的目的。
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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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基金项目：
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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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作者简介：
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张丹（1979-），女，硕士，讲师，E-mail：4380271@qq.com
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