蠕变过程中P91钢晶界析出相的变化行为

doi:10.13251/j.issn.0254-6051.2023.05.005

金属热处理 ›› 2023, Vol. 48 ›› Issue (5): 25-31.DOI: 10.13251/j.issn.0254-6051.2023.05.005

蠕变过程中P91钢晶界析出相的变化行为

顾宝兰, 刘嘉晨, 孙浩宇, 柳旺, 于海洋

中国特种设备检测研究院, 北京 100029

收稿日期:2022-11-15 修回日期:2023-03-24 出版日期:2023-05-25 发布日期:2023-06-21
作者简介:顾宝兰(1982—),女,高级工程师,硕士,主要研究方向为耐热钢及失效分析,E-mail: gubaolan@163.com
基金资助:
“十四五”国家重点研发计划(2021YFC3001801);国家市场监督管理总局科技计划(2017QK101)

Behavior of grain boundary precipitates of P91 steel during creep process

Gu Baolan, Liu Jiachen, Sun Haoyu, Liu Wang, Yu Haiyang

China Special Equipment Inspection and Research Institute, Beijing 100029, China

Received:2022-11-15 Revised:2023-03-24 Online:2023-05-25 Published:2023-06-21

摘要/Abstract

摘要： 对600 ℃和650 ℃蠕变持久断裂试验过程中P91钢组织演变及晶界析出相的变化规律进行了研究。结果表明,在蠕变过程中,P91钢马氏体板条组织随蠕变断裂时间增加逐渐趋于分散,晶界析出相的数量及尺寸增加。晶界上的析出相主要为M₂₃C₆相和Laves(Fe₂Mo)相,Laves相的形核点主要位于晶界上M₂₃C₆相界面处,晶界上的M₂₃C₆相与基体相比具有更高含量的Mo,为Laves相的形成和粗化提供了有利条件,同时晶界上偏聚的Si增加了钢的自扩散系数,促进了Laves相的形成,也使得Laves相的粗化速率较M₂₃C₆相更高。在蠕变过程中P91钢的硬度随断裂时间的延长呈下降趋势,且试验温度越高硬度下降越明显。

关键词: P91钢, 蠕变持久, Laves相, 晶界析出相

Abstract: Microstructure evolution and change law of grain boundary precipitates of P91 steel during the 600 ℃ and 650 ℃ creep rupture tests were studied. The results show that during the creep process, martensite lath tends to disperse gradually with the increase of creep rupture time, and the number and size of grain boundary precipitates increase. The grain boundary precipitates are mainly M₂₃C₆ and Laves(Fe₂Mo) phases, the nucleating location of Laves phase is mainly at the interface of M₂₃C₆ phase on the grain boundary, because M₂₃C₆ phase on grain boundary has a higher content of Mo than that in the matrix, providing favorable conditions for the formation and coarsening of Laves phase. At the same time, the segregation of Si on grain boundary increases the self diffusion coefficient of the steel, promotes the formation of Laves phase, and also makes the coarsening rate of Laves phase higher than that of M₂₃C₆ phase. During the creep process, the hardness of the P91 steel decreases with the extension of creep rupture time, and the higher the test temperature, the more obvious the decrease of the hardness.

Key words: P91 steel, creep, Laves phase, grain boundary precipitates

中图分类号:

TG142.1

顾宝兰, 刘嘉晨, 孙浩宇, 柳旺, 于海洋. 蠕变过程中P91钢晶界析出相的变化行为[J]. 金属热处理, 2023, 48(5): 25-31.

Gu Baolan, Liu Jiachen, Sun Haoyu, Liu Wang, Yu Haiyang. Behavior of grain boundary precipitates of P91 steel during creep process[J]. Heat Treatment of Metals, 2023, 48(5): 25-31.

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蠕变过程中P91钢晶界析出相的变化行为

Behavior of grain boundary precipitates of P91 steel during creep process

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