杨昊,梁恩溥,杨勇,李浩,王中成,徐乐,王毛球

• 1:钢铁研究总院有限公司特殊钢研究院
• 2:重庆长安望江工业集团有限公司
• 3:内蒙古北方重工业集团有限公司

摘要(Abstract)：

在25Cr3Mo3NiNbZr钢(S1)基础之上通过成分调整及热处理工艺优化，制备了一种新型耐高温马氏体钢15CrMo2NiVNbZr(S2),并对它们开展了高温力学性能研究，分析强化机制。结果表明：700℃下S2钢的抗拉强度和屈服强度分别可达到583.0和485.5 MPa,相比S1钢提升分别了38.8%和52.7%,具有良好的高温强度；回火后，S2钢在马氏体板条内和边界处弥散析出了M_3C碳化物；在700℃拉伸过程中，M_3C回溶于基体，析出了均匀分布在板条内的平均尺寸为5.74 nm的M_2C碳化物，细小弥散的碳化物同时起到钉扎位错和析出强化的作用，是其700℃高温性能提升的主要原因；通过析出强化计算，S2钢的析出强化增量为343 MPa,相比S1钢的强化增量增加了55.9%。

关键词(KeyWords)： 马氏体钢;700℃高温强度;M_2C碳化物;MC碳化物;强化机制

Abstract:

Keywords:

基金项目(Foundation): 自主投入项目(集23T61260)

作者(Author): 杨昊,梁恩溥,杨勇,李浩,王中成,徐乐,王毛球

DOI: 10.13289/j.issn.1009-6264.2024-0414

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