P91钢管道异常低硬度部位的组织和性能

doi:10.13251/j.issn.0254-6051.2020.03.001

金属热处理 ›› 2020, Vol. 45 ›› Issue (3): 1-6.DOI: 10.13251/j.issn.0254-6051.2020.03.001

• 组织与性能 • 下一篇

P91钢管道异常低硬度部位的组织和性能

范德良¹, 王志武¹, 句光宇²

1. 武汉大学动力与机械学院, 湖北武汉 430072;
2. 中国大唐集团科学技术研究院有限公司华中电力试验研究院, 河南郑州 450000

收稿日期:2019-09-20 出版日期:2020-03-25 发布日期:2020-04-03
通讯作者: 王志武,教授,博士,主要从事奥氏体不锈钢的组织与性能研究,E-mail:wzw1618@163.com
作者简介:范德良(1994—),男,硕士研究生,主要从事奥氏体不锈钢的组织与性能研究,E-mail:fandeliang@foxmail.com。

Microstructure and properties of P91 steel pipeline in abnormal low hardness parts

Fan Deliang¹, Wang Zhiwu¹, Ju Guangyu²

1. School of Power and Mechanical Engineering, Wuhan University, Wuhan Hubei 430072, China;
2. Central-China Electric Power Research Institute, China Datang Corporation Science and Technology Research Institute, Zhengzhou Henan 450000, China

Received:2019-09-20 Online:2020-03-25 Published:2020-04-03

摘要/Abstract

摘要：

对电厂运行过程中发现的P91钢主蒸汽管道的低硬度部位进行了微观组织观察、短时力学性能试验和高温持久强度试验,分析了其硬度偏低的原因。结果表明,低硬度区域P91钢组织为铁素体+析出物,位错密度较低,M₂₃C₆相在晶界处粗化聚集,同时析出新相Laves相,使得P91钢的短时力学性能和高温持久强度下降严重。

关键词: P91钢管道, 低硬度, 高温持久强度, 析出相

Abstract:

The causes of abnormal low hardness found in some parts of P91 steel main steam pipeline during operation of power plant were analyzed by microstructure observation, short-term mechanical properties test and high temperature creep rupture strength test. The results show that the microstructure in low hardness parts of the P91 steel is composed of ferrite and precipitates. The ferrite has a relatively low dislocation density, while the precipitate phases include coarsened M₂₃C₆ phase aggregating at grain boundary, as well as a new precipitated phase of Laves type. Such a microstructure leads to serious reduction of the short-term mechanical properties and high-temperature durability of the P91 steel.

Key words: P91 steel pipeline, low hardness, high temperature creep rupture strength, precipitated phase

中图分类号:

TG142.73

范德良, 王志武, 句光宇. P91钢管道异常低硬度部位的组织和性能[J]. 金属热处理, 2020, 45(3): 1-6.

Fan Deliang, Wang Zhiwu, Ju Guangyu. Microstructure and properties of P91 steel pipeline in abnormal low hardness parts[J]. HTM, 2020, 45(3): 1-6.

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P91钢管道异常低硬度部位的组织和性能

Microstructure and properties of P91 steel pipeline in abnormal low hardness parts

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