Chinese Journal of Mechanical Engineering >

2021 , Vol. 34 >Issue 6: 131 - 131

DOI: https://doi.org/10.1186/s10033-021-00661-5

Research article

Nanoindentation Characterization of Creep-fatigue Interaction on Local Creep Behavior of P92 Steel Welded Joint

  • Yuxuan Song ,
  • Yi Ma ,
  • Zhouxin Pan ,
  • Yuebing Li ,
  • Taihua Zhang ,
  • Zengliang Gao
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  • 1 Institute of Process Equipment and Control Engineering, College of Mechanical Engineering, Zhejiang University of Technology, Hangzhou, 310014, China;
    2 Institute of Micro/Nano-Mechanical Testing Technology & Application, College of Mechanical Engineering, Zhejiang University of Technology, Hangzhou, 310014, China;
    3 Institute of Solid Mechanics, Beihang University, Beijing, 100000, China;
    4 Engineering Research Center of Process Equipment and Re-manufacturing, Ministry of Education, Hangzhou, 310014, China
Yuxuan Song, born in 1992, is currently a doctoral candidate at Institute of Process Equipment and Control Engineering and Institute of Micro/Nano-Mechanical Testing Technology & Application of Zhejiang University of Technology. His research interests include creep-fatigue interaction and mechanics of nanoindentation. E-mail: songyux@zjut.edu.cn;
Yi Ma, born in 1987, is currently a professor at Institute of Micro/Nano-Mechanical Testing Technology & Application of Zhejiang University of Technology. His research interests include experiment mechanics, surface and interface mechanics, damage mechanics. E-mail: may@zjut.edu.cn;
Zhouxin Pan, born in 1995, is currently a master candidate at Institute of Process Equipment and Control Engineering of Zhejiang University of Technology. His research interests include creep-fatigue interaction, structural integrity and reliability. E-mail: zhouxinpan@zjut.edu.cn;
Yuebing Li, born in 1987, is currently a professor at Institute of Process Equipment and Control Engineering of Zhejiang University of Technology. His research interests include fracture mechanics, structural integrity and reliability. E-mail: ybli@zjut.edu.cn;
Taihua Zhang, born in 1966, is a professor at Institute of Solid Mechanics of Beihang University. His research interests include mechanical instrument research and development, mechanics of micro- and nano-materials. E-mail: zhangth66@buaa.edu.cn;
Zengliang Gao, born in 1960, is currently a professor at Institute of Process Equipment and Control Engineering of Zhejiang University of Technology and Engineering Research Center of Process Equipment and Re-manufacturing of the Ministry of Education. His research interests include structural integrity assessment and process equipment design. E-mail: zlgao@zjut.edu.cn

收稿日期: 2020-12-28

  修回日期: 2021-08-12

  网络出版日期: 2022-04-03

基金资助

Supported by National 13th Five-Year Key Technologies R&D Program of China (Grant No. 2016YFC0801902), National Natural Science Foundation of China (Grant No. 11727803, 11672356, 52075490), Fundamental Research Funds for the Provincial Universities of Zhejiang (Grant No. RF-A2020010).

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Nanoindentation Characterization of Creep-fatigue Interaction on Local Creep Behavior of P92 Steel Welded Joint

  • Yuxuan Song ,
  • Yi Ma ,
  • Zhouxin Pan ,
  • Yuebing Li ,
  • Taihua Zhang ,
  • Zengliang Gao
Expand
  • 1 Institute of Process Equipment and Control Engineering, College of Mechanical Engineering, Zhejiang University of Technology, Hangzhou, 310014, China;
    2 Institute of Micro/Nano-Mechanical Testing Technology & Application, College of Mechanical Engineering, Zhejiang University of Technology, Hangzhou, 310014, China;
    3 Institute of Solid Mechanics, Beihang University, Beijing, 100000, China;
    4 Engineering Research Center of Process Equipment and Re-manufacturing, Ministry of Education, Hangzhou, 310014, China

Received date: 2020-12-28

  Revised date: 2021-08-12

  Online published: 2022-04-03

Supported by

Supported by National 13th Five-Year Key Technologies R&D Program of China (Grant No. 2016YFC0801902), National Natural Science Foundation of China (Grant No. 11727803, 11672356, 52075490), Fundamental Research Funds for the Provincial Universities of Zhejiang (Grant No. RF-A2020010).

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摘要

In modern fossil and nuclear power plants, the components are subjected to creep, fatigue, and creep-fatigue (CF) due to frequent start-up and shut-down operations at high temperatures. The CF interaction on the in-service P92 steel welded joint was investigated by strain-controlled CF tests with different dwell times of 30, 120, 300, 600 and 900 s at 650℃. Based on the observations of the fracture surface by scanning electron microscope (SEM), the characteristic microstructure of fatigue-induced damage was found for the CF specimens with short dwell times (30 and 120 s). The hardness, elastic modulus and creep deformation near the fracture edges of four typical CF specimens with 30, 120, 600 and 900 s dwell times were measured by nanoindentation. Compared to specimens with post-weld heat treatment (PWHT), lower hardness and creep strength were found for all CF specimens. In addition, significant reductions in hardness, elastic modulus, and creep strength were measured near the fracture edges for the CF specimens with short dwell times compared to the PWHT specimens. Compared to PWHT specimens (0.007), the increased strain rate sensitivities (SRS) of 0.010 to 0.17 were estimated from secondary creep. The increased values of SRS indicate that the room temperature creeps behavior is strongly affected by the decrease in dislocation density after the CF tests.

关键词： P92 steel; Welded joint; Creep-fatigue interaction; Nanoindentation; Creep behavior

本文引用格式

Yuxuan Song , Yi Ma , Zhouxin Pan , Yuebing Li , Taihua Zhang , Zengliang Gao . Nanoindentation Characterization of Creep-fatigue Interaction on Local Creep Behavior of P92 Steel Welded Joint[J]. Chinese Journal of Mechanical Engineering, 2021 , 34(6) : 131 -131 . DOI: 10.1186/s10033-021-00661-5

Abstract

In modern fossil and nuclear power plants, the components are subjected to creep, fatigue, and creep-fatigue (CF) due to frequent start-up and shut-down operations at high temperatures. The CF interaction on the in-service P92 steel welded joint was investigated by strain-controlled CF tests with different dwell times of 30, 120, 300, 600 and 900 s at 650℃. Based on the observations of the fracture surface by scanning electron microscope (SEM), the characteristic microstructure of fatigue-induced damage was found for the CF specimens with short dwell times (30 and 120 s). The hardness, elastic modulus and creep deformation near the fracture edges of four typical CF specimens with 30, 120, 600 and 900 s dwell times were measured by nanoindentation. Compared to specimens with post-weld heat treatment (PWHT), lower hardness and creep strength were found for all CF specimens. In addition, significant reductions in hardness, elastic modulus, and creep strength were measured near the fracture edges for the CF specimens with short dwell times compared to the PWHT specimens. Compared to PWHT specimens (0.007), the increased strain rate sensitivities (SRS) of 0.010 to 0.17 were estimated from secondary creep. The increased values of SRS indicate that the room temperature creeps behavior is strongly affected by the decrease in dislocation density after the CF tests.

Key words： P92 steel; Welded joint; Creep-fatigue interaction; Nanoindentation; Creep behavior

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