马氏体耐热钢P92焊接接头IV型蠕变裂纹形成机理研究现状

doi:10.13251/j.issn.0254-6051.2025.11.013

摘要/Abstract

摘要： 马氏体耐热钢P92支撑了我国600 ℃超超临界电站批量建设,新一代煤电要求深度调峰灵活发电,P92钢管道焊接接头IV型蠕变裂纹是影响机组安全运行的瓶颈。本文综述了国内外P92钢焊接接头IV型裂纹形成机理研究现状,主要包括接头“弱化区”在蠕变过程的组织退化、应力状态和裂纹扩展的温度应力范围对IV型裂纹产生的影响,提出抑制P92钢焊接接头IV型蠕变裂纹产生倾向的建议,但IV型蠕变裂纹是P92钢焊接接头的固有特性,新形势下工程上若想从根本上解决可选用更高等级、IV型蠕变裂纹敏感性低的耐热钢。

关键词: P92钢, 焊接接头, 热影响区, IV型蠕变裂纹

Abstract: Martensitic heat-resistant steel P92 supports the batch construction of 600 ℃ ultra-supercritical power stations in China. The new generation coal-fired powers demand deep cycling operation and adaptable electricity generation, the type IV creep cracks in the P92 steel pipe welded joints pose a bottleneck that affects the safe operation of the unit. This paper reviewed the research status of the formation mechanism of type IV cracks in P92 steel welded joints at home and abroad, mainly focusing on the influence of the microstructure degradation, stress state and temperature and stress range of crack propagation of weakened zone during the creep process on type IV cracks of the joint, and put forward suggestions to inhibit the tendency of type IV creep cracks of the P92 steel welded joints. But type IV creep cracks are an inherent characteristic of P92 steel welded joints. Under the new circumstances, to fundamentally address the issue in engineering projects, the heat-resistant steel with higher grade and low type IV creep crack sensitivity can be opt for.

Key words: P92 steel, welded joints, heat affected zone, type IV creep cracks

中图分类号:

TG142.1

陈正宗, 刘正东, 陈千, 蔡文河, 姜海峰, 刘峰, 何西扣. 马氏体耐热钢P92焊接接头IV型蠕变裂纹形成机理研究现状[J]. 金属热处理, 2025, 50(11): 82-91.

Chen Zhengzong, Liu Zhengdong, Chen Qian, Cai Wenhe, Jiang Haifeng, Liu Feng, He Xikou. Research status on formation mechanism of type IV creep cracks in welded joints of martensitic heat-resistant steel P92[J]. Heat Treatment of Metals, 2025, 50(11): 82-91.

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