Hot deformation behavior of medium carbon V-N microalloyed steel

• Published in: Transactions of Nonferrous Metals Society of China Vol. 19; no. 6; pp. 1389 - 1394
• Main Author: 许磊 王承阳 刘国权 白秉哲
• Format: Journal Article
• Language: English
• Published: Elsevier Ltd 01.12.2009; School of Materials Science and Engineering,University of Science and Technology Beijing,Beijing 100083,China%School of Materials Science and Engineering,University of Science and Technology Beijing,Beijing 100083,China%Department of Materials Science and Engineering,Tsinghua University,Beijing 100084,China; Department of Materials Science and Engineering,Tsinghua University,Beijing 100084,China
• Subjects: dynamic recrystallization; hot deformation; medium carbon V-N microalloyed steel; processing map; 不稳定; 临界应变; 动态再结晶; 热变形行为; 研究开发; 钒微合金钢; 高应变速率; medium carbon V-N microalloyed steel; processing map; dynamic recrystallization; hot deformation
• ISSN: 1003-6326
• DOI: 10.1016/S1003-6326(09)60038-8

Processing maps for a medium carbon V-N microalloyed steel（designated as VN steel） and a medium carbon V-N bared steel（designated as Non-VN steel） were developed to study the hot deformation behavior and the influence of vanadium and nitrogen, in the temperature range of 750-1 100 ℃ and strain rate range of 0.005-30 s^- 1. Experimental results show that the processing map for the VN steel exhibits two dynamic recrystallization and three instability domains, while that for the Non-VN steel has one dynamic recrystallization and three instability domains. The instability domains of VN steel are larger than those of the Non-VN steel, and the VN steel is easier to be unstable when being hot deformed at high temperature and high stain rate. The addition and precipitation of vanadium and nitrogen can hinder the dynamic recrystallization. Compared with the Non-VN steel, the VN steel has higher dynamic recrystallization critical strain and the corresponding stress.