服役8.8万小时后超临界机组P91钢马氏体结构的退化行为

doi:10.13251/j.issn.0254-6051.2023.02.012

金属热处理 ›› 2023, Vol. 48 ›› Issue (2): 74-78.DOI: 10.13251/j.issn.0254-6051.2023.02.012

服役8.8万小时后超临界机组P91钢马氏体结构的退化行为

张安文¹, 王洋², 张志博¹, 江峰³

1.西安热工研究院有限公司, 陕西西安 710054;
2.中国华能集团有限公司, 北京 100031;
3.西安交通大学金属材料强度国家重点实验室, 陕西西安 710049

收稿日期:2022-09-23 修回日期:2022-12-17 出版日期:2023-02-25 发布日期:2023-03-22
通讯作者: 张志博,正高级工程师,硕士,E-mail:zhangzhibo@tpri.com.cn
作者简介:张安文(1988—),男,工程师,博士,主要研究方向为耐热钢、高温合金等,E-mail:zhanganwen@tpri.com.cn。

Martensitic degeneration behavior of P91 steel served for eighty-eight thousand hours in a supercritical unit

Zhang Anwen¹, Wang Yang², Zhang Zhibo¹, Jiang Feng³

1. Xi'an Thermal Power Research Institute Co., Ltd., Xi'an Shaanxi 710054, China;
2. China Huaneng Group Co., Ltd., Beijing 100031, China;
3. State Key Laboratory for Mechanical Behavior of Materials, Xi'an Jiaotong University, Xi'an Shaanxi 710049, China

Received:2022-09-23 Revised:2022-12-17 Online:2023-02-25 Published:2023-03-22

摘要/Abstract

摘要： 采用SEM、EBSD和TEM从不同尺度对比服役超8万小时P91钢与未服役P91钢的马氏体结构差异,并对马氏体结构作定量统计对比,分析长期服役P91钢马氏体结构的退化行为,讨论马氏体退化对力学性能的影响机制。结果表明,服役后马氏体板条块(Block)结构粗化,平均尺寸增大61.6%,尺寸正态分布顶点数值增大70%;板条束集(Packet)结构粗化,平均尺寸增大21%,正态分布顶点数值增大25.4%。板条束集结构粗化通过板条块的粗化来实现,板条块结构粗化程度大于板条束集。长期服役P91钢马氏体结构位错密度降低,导致取向差小于15°的结构占比减小8.6%。板条块(Block)结构粗化和马氏体结构内位错密度降低是导致长期服役后P91钢强度降低的重要因素。

关键词: P91钢, 长时服役, 马氏体结构, 退化行为

Abstract: Martensite structure differences between P91 steel not in service and in service over 80 000 hours were compared by means of SEM, EBSD and TEM at different scales. The statistical and quantitative comparison of martensitic structure was made, the degradation behavior of martensitic structure in long-term service was analyzed, and the influence mechanism of martensitic structure degradation on mechanical properties was discussed. The results show that the structure of martensite block is coarsened, the average size of block increases by 61.6%, and the vertex value of size normal distribution increases by 70%. The martensite packet structure is also coarsened, the average size increases by 21%, and the normal distribution vertex value increases by 25.4%. The structure coarsening of packet is realized by the coarsening of block, and the degree of coarsening of block is greater than that of packet. The dislocation density decreases, resulting in a decrease of 8.6% in the proportion of structure with misorientation less than 15°. The coarsening of block structure and the decrease of dislocation density in martensitic structure are the important factors leading to the decrease of strength of the P91 steel after long-term service.

Key words: P91 steel, long-term service, martensite structure, degeneration behavior

中图分类号:

TK225

张安文, 王洋, 张志博, 江峰. 服役8.8万小时后超临界机组P91钢马氏体结构的退化行为[J]. 金属热处理, 2023, 48(2): 74-78.

Zhang Anwen, Wang Yang, Zhang Zhibo, Jiang Feng. Martensitic degeneration behavior of P91 steel served for eighty-eight thousand hours in a supercritical unit[J]. Heat Treatment of Metals, 2023, 48(2): 74-78.

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服役8.8万小时后超临界机组P91钢马氏体结构的退化行为

Martensitic degeneration behavior of P91 steel served for eighty-eight thousand hours in a supercritical unit

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