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通过Gleeble-3800型热模拟机研究一种新型冷轧辊用高合金锻钢在不同加热速率(5~50℃/s),加热温度(1050~1150℃)及保温时间(10~800 s)下的奥氏体晶粒长大规律。结果表明:试验钢的平均奥氏体晶粒尺寸随加热速率的升高而减小,同时随加热温度的升高和保温时间的延长而增大。基于金相试验数据利用回归分析建立了描述新型冷轧辊用高合金锻钢不同加热速率下加热与保温过程的奥氏体晶粒长大规律的数学模型。
A new type of high alloyed forged steel for cold rolling was investigated by Gleeble-3800 thermal simulator at different heating rates (5 ~ 50 ℃ / s), heating temperature (1050 ~ 1150 ℃) and holding time (10 ~ 800 s) Austenite grain growth law. The results show that the average austenite grain size decreases with the increase of heating rate and increases with the increase of heating temperature and holding time. Based on the metallographic test data, a mathematical model describing the regularity of austenite grain growth during heating and holding of high alloyed forged steels with different heating rates was established by regression analysis.