低碳低合金钢形变奥氏体再结晶规律研究
Study on Recrystallization Rule of Deformed Austenite in Low Carbon Low Alloy Steel
王立军, 武会宾, 余 伟, 蔡庆伍
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作者单位：北京科技大学 高效轧制国家工程研究中心, 北京 100083
中文关键字：再结晶； 形变奥氏体； 低碳低合金钢
英文关键字：recrystallization; deformed austenite; low carbon low alloy steel
中文摘要：采用阶梯试样，通过光学显微镜观察，研究了低碳Mn、Ni、Mo、Nb、Cr、V等低合金化钢形变奥氏体再结晶规律，分析了变形温度、变形量等工艺参数对变形奥氏体再结晶百分数的影响，绘制了实验钢变形奥氏体再结晶图。结果表明，在变形量为50%、轧制温度为1050 ℃和在变形量为70%、轧制温度为1000 ℃时，实验钢均发生完全再结晶。为此，应控制再结晶区终轧温度高于1000 ℃，多道次累积变形量大于60%；控制非再结晶区开轧温度低于950 ℃，第一道次变形量15%～20%。
英文摘要：The recrystallization rule of deformed austenite in low carbon low alloy steel containing Mn, Ni, Mo, Nb, Cr, and V was investigated by optical microscope using the stepped specimen. The effects of process parameters, including rolling temperature and reduction, on the recrystallization fraction of deformed austenite were analysed. The figure of deformed austenite recrystallization of tested steel was drawn. The results indicate that the complete recrystallization of tested steel occurs under the conditions of the reduction of 50% and the rolling temperature of 1050 ℃ or the reduction of 70% and the rolling temperature of 1000 ℃. Therefore, the rolling temperature in recrystallization region should be above 1000 ℃, the multi-pass accumulative reduction is more than 60%; while the rolling temperature in non-recrystallization region should be below 950 ℃, the first-pass deformation ranges from 15% to 20%.