以核电站环形起重机用42CrMo耐热钢为研究对象,分析了显微组织中碳化物形貌和分布随回火温度的变化及其对冲击韧性的影响.结果表明,42CrMo钢经水淬后在500 650℃区间回火,显微组织均为回火索氏体.随回火温度上升,12℃冲击功先增加后减小；经500和530℃回火后,片状碳化物不均匀分布于原马氏体板条界上,冲击功分别为26和44 J；600℃回火后碳化物呈颗粒状弥散分布,冲击功达到峰值104 J；600℃以上回火,颗粒状碳化物明显粗化,冲击功下降.碳化物的形貌和分布是影响42CrMo钢冲击性能的关键因素.
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