采用Gleeble-3800热/力模拟试验机研究了超快冷条件下含Nb钢在铁素体相变区的析出行为.考虑Nb(C,N)在铁素体中的固溶度积和Nb元素在铁素体中的扩散系数,给出了超快冷条件下Nb在铁素体相变区的析出模型.结果表明:轧后超快冷至650℃(铁素体相变区)可抑制Nb在奥氏体中析出,实现Nb在铁素体相变区中的析出;与在奥氏体中析出行为相比,Nb在铁素体中析出物数量明显增加,尺寸显著细化,析出物粒子密度由79个/μm2增加到373个/μm2,析出物尺寸由12.9nm细化到8.1nm,有利于发挥Nb的析出强化效果;该含Nb实验钢在铁素体中析出时最大形核率温度为620℃,最快沉淀析出温度为700℃,且计算与实测的析出相体积分数吻合良好,说明该模型可以用来模拟超快冷条件下Nb在铁素体相变区的析出行为.
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