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本文用40Cr 钢研究了奥氏体晶粒的异常长大过程以及加热前的原始组织对异常长大过程的影响,并利用已有的计算驱动力 P 及阻力 F 的公式进行了定量计算及分析讨论。结果表明,当奥氏体起始晶粒的 P>F 时,晶粒将发生长大。在长大过程中,已开始长大的大晶粒不断吞并周围小晶粒,周围小晶粒则基本上不长大。当小晶粒消失,大晶粒彼此相遇时,长大将终止。可以通过预备热处理调整加热前的原始组织,从而改变奥氏体起始晶粒的 D、D_(n,x)、Z_0及r,控制 P 及 F。对 Zener、Gladman,等的公式进行了校验。结果表明,按戚正风公式计算所得 P 与实测结果符合得最好。按 Zener 公式计算所得 P 偏高,按 Gladmom 公式计算所得 P 又偏低。
In this paper, 40Cr steel was used to study the effect of the abnormal growth process of austenite grains and the growth of the original microstructure before heating, and the calculation and analysis were made based on the existing formulas for calculating the driving force P and the resistance F discuss. The results show that when P> F of austenite initial grains, the grains will grow up. In the process of growing up, large grains that have started to grow continue to swallow small grains around, and small grains around them basically do not grow up. As small grains disappear and large grains meet each other, the growth will end. D, D_ (n, x), Z_0 and r of the starting austenite grains can be controlled by pre-heat treatment to adjust the original microstructure before heating to control P and F. The formulas for Zener, Gladman, and others were verified. The result shows that the calculated P calculated according to Qi Zhengfeng formula is in good agreement with the measured data. P calculated by Zener formula is high, according to Gladmom formula P calculated and low.