研究了在有、无外加磁场条件下热处理时，低活化钢中析出相的长大规律及其对力学性能的影响.经高温强磁场热处理后低活化钢的屈服强度和抗拉强度均比无磁场热处理时低，而冲击韧性并无明显变化.强磁场显著抑制M23C6(M=Cr，W和Fe)沿原奥氏体晶界和马氏体板条界定向长大，强磁场下碳化物/铁素体界面能增大是导致长杆状M23C6碳化物球化的主要因素，并导致析出相颗粒密度降低，平均尺寸增大.利用Langer-Schwartz模型描述了低活化钢在高温强磁场条件下析出相的粗化过程.构建三维立体模型修正了屈服强度与沉淀强化关系的公式，定量描述了析出相的粗化过程对低活化钢力学性能的影响，模拟结果与实验结果符合较好.
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