Effect of Pre-deformation on Grain Ultrafining by Intercritical Deformation in Low-Carbon Microalloyed Steels
来源期刊：Acta Metallurgica Sinica2018年第10期
论文作者：Ba Li Qing-You Liu Shu-Jun Jia Yi Ren Bing Wang
文章页码：1038 - 1048
摘 要：In this study, the effect of pre-deformation at recrystallization and non-recrystallization zone on the grain ultrafining by the subsequent intercritical deformation（ID） was investigated on low-carbon microalloyed steel. The results showed that ultrafine grain microstructure with an average size of 1.0 lm was fabricated through pre-deformation in the recrystallization zone followed by ID. When pre-deformed at the non-recrystallization zone prior to ID, the grain size increased to 1.6 lm with a heterogeneous distribution along with the well-developed dynamic recovery of ferrite. The grain ultrafining mechanism was attributed to the combined action of the deformation-induced ferrite transformation and the continuous dynamic recrystallization. In particular, the continuous dynamic recrystallization process during ID occurred on the pro-eutectoid ferrite as a result of the subgrain rotation mechanism and the absorbing dislocations mechanism.
Ba Li1，Qing-You Liu1，Shu-Jun Jia1，Yi Ren2，Bing Wang1
1. Central Iron and Steel Research Institute2. Iron and Steel Research Institute, Ansteel Group Co., Ltd.
摘 要：In this study, the effect of pre-deformation at recrystallization and non-recrystallization zone on the grain ultrafining by the subsequent intercritical deformation（ID） was investigated on low-carbon microalloyed steel. The results showed that ultrafine grain microstructure with an average size of 1.0 lm was fabricated through pre-deformation in the recrystallization zone followed by ID. When pre-deformed at the non-recrystallization zone prior to ID, the grain size increased to 1.6 lm with a heterogeneous distribution along with the well-developed dynamic recovery of ferrite. The grain ultrafining mechanism was attributed to the combined action of the deformation-induced ferrite transformation and the continuous dynamic recrystallization. In particular, the continuous dynamic recrystallization process during ID occurred on the pro-eutectoid ferrite as a result of the subgrain rotation mechanism and the absorbing dislocations mechanism.
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