Effect of Pre-deformation on Grain Ultrafining by Intercritical Deformation in Low-Carbon Microalloyed Steels

• 来源期刊: 金属学报（英文版）
• 年，卷（期）: 2018,（10）
• 页码范围: 1038-1048
• 页数: 11页
• 语种: 英文

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 μm 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 μm 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.