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采用金相试验,应用Beck、Hillert、Sellars数学模型分析了A315钢再结晶过程中不同加热温度和保温时间下的奥氏体晶粒长大行为。结果表明,随加热温度的升高和保温时间的延长,A315钢奥氏体晶粒逐渐长大,其长大过程可以分为抑制长大阶段和自由长大阶段。通过对比Beck、Hillert、Sellars三种奥氏体晶粒长大数学模型,得出Sellars模型对A315钢奥氏体晶粒尺寸的预测有很高的精度,其数学模型方程为:当温度为950℃≤T≤1100℃时,D2.42=2.65×107texp(-187 284/(RT));当温度为1150℃≤T≤1200℃时,D2.86=3.04×1024texp(-589 475/(RT))。
The metallographic test was used to analyze the austenite grain growth behavior of A315 steel during recrystallization under different heating temperatures and holding time using Beck, Hillert and Sellars mathematical models. The results show that austenite grains of A315 steel grow up gradually with the increase of heating temperature and holding time, and the growth process of A315 steel can be divided into the phase of inhibiting growth and free growth. By comparing the three kinds of austenite grain growth model with Beck, Hillert and Sellars, it is concluded that the Sellars model has high accuracy in predicting the austenite grain size of A315 steel. The mathematical model equation is as follows: when the temperature is 950 D2.42 = 2.65 × 107texp (-187 284 / (RT)) when the temperature is less than or equal to T ≤ 1100 ° C, and D2.86 = 3.04 × 1024texp when the temperature is 1150 ° C ≤ T ≤ 1200 ° C (-589 475 / ( RT)).