高温回火P91钢显微组织演变及再结晶机理

doi:10.13251/j.issn.0254-6051.2023.11.006

金属热处理 ›› 2023, Vol. 48 ›› Issue (11): 38-44.DOI: 10.13251/j.issn.0254-6051.2023.11.006

高温回火P91钢显微组织演变及再结晶机理

周浩¹, 王云², 曾燕屏²

1.中国大唐集团科学技术研究总院有限公司大唐华北电力试验研究院, 北京 100043;
2.北京科技大学材料科学与工程学院, 北京 100083

收稿日期:2023-05-29 修回日期:2023-08-28 出版日期:2023-11-25 发布日期:2023-12-27
作者简介:周浩(1995—),男,工程师,硕士,主要研究方向为高性能金属材料及电站金属材料失效分析,E-mail:ustbzhouhao@163.com

Effect of high-temperature tempering on microstructure evolution and recrystallization mechanism of P91 steel

Zhou Hao¹, Wang Yun², Zeng Yanping²

1. Datang North China Electric Power Test and Research Institute, China Datang Group Science and Technology Research Institute Co., Ltd., Beijing 100043, China;
2. School of Materials Science & Engineering, University of Science and Technology Beijing, Beijing 100083, China

Received:2023-05-29 Revised:2023-08-28 Online:2023-11-25 Published:2023-12-27

摘要/Abstract

摘要： 通过热膨胀法测定试验所用P91钢的相变点,采用OM、TEM及EBSD等,研究P91钢在710、730、760、770、790、810、830、840 ℃回火过程中显微组织及特殊晶界的演变过程。发现随着回火温度的升高,P91钢中的板条马氏体形貌特征逐渐模糊,位错密度逐渐降低,并且出现等轴状的铁素体组织。经EBSD分析,高角度晶界的含量同样随回火温度的升高而逐渐升高并趋于稳定,而小角度晶界的含量显著减少。分析表明,P91钢在高温回火过程中发生了再结晶,形成了等轴晶铁素体,通过亚晶聚合及晶界迁移机制来形核,从而实现再结晶。

关键词: P91耐热钢, 回火, 再结晶, 组织演变

Abstract: Phase transformation point of P91 steel was determined by thermal expansion method. The microstructure and the evolution of special grain boundaries of the P91 steel during tempering at 710, 730, 760, 770, 790, 810, 830 and 840 ℃ were studied by means of OM, TEM and EBSD. It is found that with the increase of tempering temperature, the lath martensite morphology in the P91 steel is weakened, the dislocation density is gradually reduced, and the equiaxed ferrite structure appears. By EBSD analysis, the content of high angle grain boundaries increases gradually with the increase of tempering temperature and tends to be stable, while the content of low angle grain boundaries is significantly reduced. The analysis shows that during the tempering process, recrystallization occurs and a certain amount of equiaxed ferrite is formed, which nucleates through the mechanism of subgrain polymerization migration and grain boundary expansion, so as to realize recrystallization.

Key words: P91 heat-resistant steel, tempering, recrystallization, microstructure evolution

中图分类号:

TG162.84

周浩, 王云, 曾燕屏. 高温回火P91钢显微组织演变及再结晶机理[J]. 金属热处理, 2023, 48(11): 38-44.

Zhou Hao, Wang Yun, Zeng Yanping. Effect of high-temperature tempering on microstructure evolution and recrystallization mechanism of P91 steel[J]. Heat Treatment of Metals, 2023, 48(11): 38-44.

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高温回火P91钢显微组织演变及再结晶机理

Effect of high-temperature tempering on microstructure evolution and recrystallization mechanism of P91 steel

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