20钢的热变形行为探讨
Discussion on Hot Deformation Behavior of 20 Steel
杨现亮1,2, 潘家冰2
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作者单位：1. 钢铁研究总院 研究生部, 北京 100081; 2. 新冶高科技集团有限公司 热轧事业部, 北京 100081
中文关键字：普碳钢； 动态再结晶； 温度曲线拐点
英文关键字：carbon steel; dynamic recrystallization; inflexion of temperature curve
中文摘要：在Gleeble-1500D热模拟试验机上进行高温轴向压缩试验，并观察了室温显微组织，得到了实验钢的热变形方程。结果表明：变形速率为1 s-1，变形温度在750、850、900、950 ℃时，利用温度曲线拐点来判断动态再结晶的开始应变是准确可行的；随变形温度的降低和变形速率的提高，得到的室温组织中铁素体越来越细小，比重也越来越高。
英文摘要：Microstructure at room temperature was observed and hot deformation equation of testing steel was established through uniaxial hot compression on Gleeble-1500D machine. The results indicate that the inflexion of temperature curve during hot deformation can represent the starting strain of dynamic recrystallization at the rate of 1 s-1, the temperature of 750 ℃, 850 ℃, 900 ℃, 950 ℃. The size of ferrite grain at room temperature is more and more small, while the proportion is more and more high with the decrease of temperature and the increase of strain rate.