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对18Ni(1800 MPa级)马氏体时效超高强度钢的奥氏体晶粒长大规律进行研究。结果表明,随加热温度的升高和保温时间的延长,奥氏体晶粒尺寸逐渐增大,当温度高于1000℃时,晶粒迅速发生粗化,当温度低于1000℃时,晶粒尺寸随保温时间的延长变化不明显;晶粒平均尺寸与保温时间的关系符合Beck方程,且温度越高,晶粒生长指数越大;在850～1150℃,18Ni(1800 MPa级)马氏体时效钢奥氏体晶粒长大激活能为223.106kJ/mol,其奥氏体晶粒平均尺寸与加热温度之间符合Arrhenius关系,并建立了该马氏体时效钢的奥氏体晶粒度长大数学模型。
The regularity of austenite grain growth of 18Ni (1800 MPa grade) martensitic ultra-high strength steel was studied. The results show that with the increase of heating temperature and holding time, the grain size of austenite gradually increases. When the temperature is higher than 1000 ℃, the grains coarsen rapidly. When the temperature is below 1000 ℃, The relationship between the average grain size and the holding time accords with the Beck equation, and the higher the temperature is, the larger the grain growth index is. The average grain size of 18Ni (1800 MPa grade) martensite The activation energy of austenite grain aging of aged steel is 223.106kJ / mol, the Arrhenius relation between the average austenite grain size and the heating temperature is met, and the austenite grain size Grow up with a mathematical model.