采用规则溶液亚点阵模型计算了新型含Nb细晶高强IF钢在不同温度(1073～ 1473 K)下碳氮化物析出相的平衡体积分数、组成成分及化学驱动力,各元素的平衡质量分数;采用经典形核长大模型计算了实验钢在不同温度(1073 ～ 1473 K)下位错处形核的临界核心尺寸、临界形核功及相对形核速率.结果表明,随着温度的降低,析出相的平衡体积分数增大,NbC在析出相中比例逐渐增加,NbN在析出相中比例逐渐降低,析出相的化学驱动力增大,固溶在钢中的各元素的质量分数降低;在位错处形核的临界核心尺寸、临界形核功减小,相对形核率增大.至1073 K时,N元素已基本析出,C和N在析出相的成分中基本达到平衡.
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