金属热处理 ›› 2025, Vol. 50 ›› Issue (1): 230-235.DOI: 10.13251/j.issn.0254-6051.2025.01.036

• 组织与性能 • 上一篇    下一篇

P92耐热钢弯头高温持久过程组织表征

彭杏娜1, 丛相州2, 彭先宽2, 涂德军1, 乔亚霞1   

  1. 1.中国电力科学研究院有限公司, 北京 100055;
    2.北京国电富通科技发展有限责任公司, 北京 102401
  • 收稿日期:2024-07-22 修回日期:2024-11-08 出版日期:2025-01-25 发布日期:2025-03-12
  • 作者简介:彭杏娜(1983—),女,高级工程师,博士,主要研究方向为电站金属材料成形及焊接,E-mail:pengxingna2325@163.com

Characterization of microstructure of P92 heat-resistant steel elbow during high-temperature creep rupture process

Peng Xingna1, Cong Xiangzhou2, Peng Xiankuan2, Tu Dejun1, Qiao Yaxia1   

  1. 1. China Electric Power Research Institute, Beijing 100055, China;
    2. Beijing Guodian Futong Technology Development Co., Ltd., Beijing 102401, China
  • Received:2024-07-22 Revised:2024-11-08 Online:2025-01-25 Published:2025-03-12

摘要: 采用扫描电镜、透射电镜、EBSD等分析方法,研究了P92钢弯头在630 ℃、不同应力(175、140、130和100 MPa)下持久过程中夹持段(时效)、变形段(蠕变)和颈缩位置(断口)的组织转变。结果表明,P92钢弯头在蠕变条件下出现应变诱导析出粗化的现象。长期时效后P92钢由马氏体板条形貌转变为刃型位错。P92钢持久断口附近的裂纹扩展初期为椭圆形孔洞,而Laves相析出后晶界强度相对前期降低,裂纹转变为楔形和花形。

关键词: P92耐热钢, 弯头, 高温持久, 组织演变

Abstract: Microstructure transformation of the clamping section (aging), deformation section (creep), and necking position (rupture) of P92 steel elbows during creep rupture at 630 ℃ and different stresses (175, 140, 130, and 100 MPa) was studied by using scanning electron microscopy, transmission electron microscopy, EBSD, etc. The results indicate that strain-induced precipitation coarsening occurs in the P92 steel elbows under creep conditions. After long-term aging, the morphology of the P92 steel changes from martensite lath to edge dislocation. The cracks near the rupture of the P92 steel initially expand into elliptical holes. After the Laves phase precipitates, the grain boundary strength decreases compared to the early stage, and the cracks transform into wedge and flower shapes.

Key words: P92 heat-resistant steel, elbow, high-temperature creep rupture, microstructure evolution

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