用透射电子显微分析了4Cr5MoSiV1钢热疲劳后的显微结构变化,结果表明,在热疲劳过程中M23C6碳化物粒子发生粗化,M23C6的尺寸r和热疲劳循环次数间并不服从简单的指数关系.表明经典理论不完全适合M23C6碳化物在热疲劳过程中的粗化行为.从经典扩散理论出发,考虑多组元扩散问题,得到了球状碳化物在热疲劳过程中的粗化方程.根据Thermo-calc热力学计算结果,进一步证实了富Cr的M23C6碳化物在热疲劳过程中为易粗化碳化物,与实验结果吻合.
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