通过对比服役前后加氢反应器挂块母材和焊缝的力学性能,对2.25Cr1Mo钢的服役退化程度进行了分析.运用金相显微镜、扫描电子显微镜对服役材料的微观组织及断口形貌进行了观察和分析.结果表明:运行12万小时挂块的力学性能下降较大,韧脆转变温度升高,并在晶界及碳化物处出现裂纹;部分碳化物粗化,呈链状分布在晶界附近,造成晶界弱化;基体合金元素含量降低,促进了P的晶界偏聚,降低了材料的回火抗力.
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