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采用KBF1400箱式电阻炉模拟大锻件的实际加热速度,研究了30Cr2Ni4MoV钢铸态组织在重新加热过程中奥氏体晶粒的长大行为。结果表明:保温时间一定,奥氏体的平均晶粒尺寸随着温度的升高呈指数增大;加热温度一定,奥氏体的平均晶粒尺寸随着保温时间的延长呈近似抛物线变化;当温度升高到1100℃时晶粒急剧长大;得到了描述30Cr2Ni4MoV铸态组织在加热过程中奥氏体的平均晶粒尺寸与保温时间关系的Beck方程,并建立了在等温条件及非等温条件下的晶粒长大模型。
KBF1400 box-type resistance furnace was used to simulate the actual heating rate of large forging. The growth behavior of austenite grains in as-cast 30Cr2Ni4MoV steel during reheating was investigated. The results show that the average grain size of austenite increases exponentially with increasing temperature when the holding time is constant. When the heating temperature is constant, the average grain size of austenite changes approximately parabolically with the increase of holding time. The temperature of the grains increases sharply when the temperature rises to 1100 ℃. The Beck equation describing the relationship between the average grain size of austenite and the holding time in the as-cast 30Cr2Ni4MoV as-cast microstructure is obtained. The isothermal and non-isothermal conditions Under the grain growth model.