在Thermo-Calc热力学软件的辅助设计下,制备了一种针对超临界水堆工况的12Cr低活性铁素体/马氏体钢.通过显微组织观察与分析,同时结合热力学及动力学计算,研究了含12％ (vol％)δ铁素体的12Cr3W钢析出行为.结果表明:1050℃淬火780℃回火后,12Cr3W钢中析出相主要为M23C6和Cr2N.M23C6主要在回火马氏体内析出,而针状Cr2N则主要在δ铁素体内析出,Cr2N相对于M23C6容易发生粗化长大,计算结果与实验值吻合.12Cr钢淬火回火后的析出相组成受δ铁素体影响.借助于Thermo-Calc软件计算得到的热力学平衡相图选择合适的淬火温度,可以有效控制淬火后δ铁素体相含量,从而优化显微组织中析出相.
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