服役后P92钢管不同硬度区的显微结构及拉伸性能

doi:10.13251/j.issn.0254-6051.2024.10.024

金属热处理 ›› 2024, Vol. 49 ›› Issue (10): 140-147.DOI: 10.13251/j.issn.0254-6051.2024.10.024

服役后P92钢管不同硬度区的显微结构及拉伸性能

李勇^1,2, 马佳林³, 王万里^1,2, 方一鸣³, 占先强^1,2, 刘俊建^1,2, 汤文明³

1.大唐锅炉压力容器检验中心有限公司, 安徽合肥 230088;
2.中国大唐集团科学技术研究总院有限公司华东电力试验研究院, 安徽合肥 230088;
3.合肥工业大学材料科学与工程学院, 安徽合肥 230009

收稿日期:2024-04-22 修回日期:2024-08-07 出版日期:2024-11-28 发布日期:2024-11-28
通讯作者: 汤文明,教授,博士,E-mail: wmtang69@126.com
作者简介:李勇(1991—),男,博士,高级工程师,主要研究方向为电站耐热材料性能评估,E-mail: 550466882@qq.com。

Microstructure and tensile properties of different hardness regions in as-served P92 steel pipe

Li Yong^1,2, Ma Jialin³, Wang Wanli^1,2, Fang Yiming³, Zhan Xianqiang^1,2, Liu Junjian^1,2, Tang Wenming³

1. Datang Boiler Pressure Vessel Inspection Center Co., Ltd., Hefei Anhui 230088, China;
2. East China Electric Power Test and Research Institute, China Datang Corporation Science and Technology General Research Institute Ltd., Hefei Anhui 230088, China;
3. School of Materials Science and Engineering, Hefei University of Technology, Hefei Anhui 230009, China

Received:2024-04-22 Revised:2024-08-07 Online:2024-11-28 Published:2024-11-28

摘要/Abstract

摘要： 某超(超)临界机组服役7万小时的P92主蒸汽管外表面硬度偏低部位径向截面不同区域处的硬度存在明显差异。采用显微分析、物相分析及室温、高温拉伸性能测试,确定不同硬度区域试样的显微结构与力学性能的特征。结果表明,低硬度试样中的马氏体板条宽化、分解更明显,逐渐向回火索氏体组织转变;在原奥氏体晶界及马氏体板条界析出的M₂₃C₆、Laves相颗粒愈加粗化,呈半连续的链状分布;同时在马氏体板条和(或)铁素体内弥散分布的析出相尺寸也较大。低硬度试样的室温、高温拉伸强度低,其室温和高温屈服强度已达不到标准的要求,可作为服役P92主蒸汽管老化状态评估时重点考核的力学性能指标。

关键词: 超(超)临界机组, P92钢管, 板条马氏体, 析出相, 硬度, 拉伸性能

Abstract: Remarkable hardness difference was found in the cross-sectional regions of low outside surface hardness in P92 main steam pipe after serving for 70 000 h. Microscopic and phase analysis, and room-/high-temperature tensile property tests were executed to confirm the microstructure characteristics and mechanical properties of the specimens in different hardness regions. The results show that for the low hardness specimens, widening and decomposing of martensite lathes is severe, lath martensite is gradually transferred to tempered martensite. The M₂₃C₆ and Laves-phase particles precipitated along the prior austenite grain boundaries and martensite lathes are further coarsened and distributed in semi-continuous chains. Meanwhile, the precipitated phase particles dispersively distributed in the martensite and (or) ferrite matrices are also expanded. The room and high temperature tensile strengths of the low hardness specimens are low too, especially, room and high temperature yield strengths of them are lower than the indexes required by the relevant national standards, which could be used for the key mechanical property index in aging state assessment of the as-served P92 main-steam pipe.

Key words: ultra supercritical unit, P92 steel pipe, lath martensite, precipitated phase, hardness, tensile properties

中图分类号:

TG142.1

李勇, 马佳林, 王万里, 方一鸣, 占先强, 刘俊建, 汤文明. 服役后P92钢管不同硬度区的显微结构及拉伸性能[J]. 金属热处理, 2024, 49(10): 140-147.

Li Yong, Ma Jialin, Wang Wanli, Fang Yiming, Zhan Xianqiang, Liu Junjian, Tang Wenming. Microstructure and tensile properties of different hardness regions in as-served P92 steel pipe[J]. Heat Treatment of Metals, 2024, 49(10): 140-147.

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服役后P92钢管不同硬度区的显微结构及拉伸性能

Microstructure and tensile properties of different hardness regions in as-served P92 steel pipe

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