基于铸辗复合成形工艺,研究了铸态30Mn钢在变形温度为950～1150℃,应变速率为0.1、0.5和1s-1时的热压缩变形中的动态再结晶行为.结果表明,在不同应变速率条件下,当形变温度高于1000℃时,所有试样都能发生动态再结晶.铸态30Mn钢动态再结晶激活能为305.83 kJ/mol;临界应变与峰值应变的比值为0.57,临界应力与峰值应力的比值为0.90;分别建立了动态再结晶体积分数和平均晶粒尺寸模型;分析了不同变形条件的显微组织.
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