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在光学显微镜下,利用Leica Metal Work软件研究了一种强度级别为2100MPa的超高强度马氏体时效钢在850～1150℃的奥氏体晶粒长大规律。结果表明,实验钢奥氏体平均晶粒尺寸随加热温度升高和保温时间的延长而增大,其奥氏体平均晶粒尺寸与保温时间规律符合Beck方程,奥氏体化温度宜控制在800～950℃,其晶粒增长指数随温度的升高而减小,850～1150℃时实验钢奥氏体晶粒长大平均激活能为108.5 kJ/mol-1,并建立了实验钢在等温加热过程中的奥氏体晶粒长大方程。
Under the optical microscope, using Leica Metal Work software to study the austenite grain growth law of an ultrahigh strength martensitic steel with strength level of 2100MPa at 850 ~ 1150 ℃. The results show that the average grain size of austenite in experimental steel increases with the increase of heating temperature and holding time. The average austenite grain size and holding time are in accordance with Beck equation. The austenitizing temperature should be controlled at 800 ~ 950 ℃, the grain growth index decreases with the increase of temperature. The average activation energy of austenite grain growth at the temperature of 850 ~ 1150 ℃ is 108.5 kJ / mol-1. Austenite Grain Growth Equation During Isothermal Heating.