李鑫,龚雪婷,武志广,赵吉庆,杨钢

• 1:中国原子能科学研究院
• 2:钢铁研究总院特殊钢研究院

摘要(Abstract)：

采用X射线衍射、扫描电镜(SEM)、透射电镜(TEM)和能谱仪(EDS)和力学性能测试等研究了2.25Cr1Mo中厚板在530℃时效不同时间后的组织和性能变化规律。结果表明：530℃时效时，板材的主要强化相为富Cr的M_7C_3相和富Mo的M_2C相。时效初期，少量M_3C相转变为M_(23)C_6相。在时效时间为100～1000 h时富Cr相的质量分数随时效时间延长而增加，随后随时效时间延长而下降，富Mo相质量分数随时效时间延长而不断上升。时效过程中，条片状贝氏体会宽化和分解。但由于细小的碳化物未明显粗化和聚集，对贝氏体亚结构有良好的钉扎作用，因此延缓了板条贝氏体亚结构退化，使板材保持较高的组织稳定性。高温时效后，板材的室温强度和冲击韧性变化不明显，530℃高温强度和塑性出现小幅降低，表明2.25Cr1Mo中厚板具有良好的性能稳定性。

关键词(KeyWords)： 2.25Cr1Mo中厚板;时效;显微组织;力学性能;高温

Abstract:

Keywords:

基金项目(Foundation): 国家重点研发计划(2020YFB0704504)

作者(Author): 李鑫,龚雪婷,武志广,赵吉庆,杨钢

DOI: 10.13289/j.issn.1009-6264.2022-0155

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