Kota Sawada
;
Yasushi Taniuchi
;
Takehiro Nojima
;
Kaoru Sekido
;
Tomotaka Hatakeyama
;
Kazuhiro Kimura
Collection
Citation
Alternative title: ASME P91鋼のクリープ挙動に及ぼす応力変動の影響
Description:
(abstract)Effect of cyclic stress changes on creep rupture strength was investigated at 600oC for MGQ and MGS heat of ASME P91 steel. There was no large difference of creep rupture strength among the heats. However, the creep rupture ductility of MGS was lower than that of MGQ in the long-term. The initial creep stress and stress after stress reduction was 120MPa and 24MPa to 84MPa, respectively. The time interval of stress reduction was 6 days for each test. For MGQ heat, no effect of stress reduction to 84MPa on creep rupture strength was observed. The stress reduction to 60MPa slightly increased time to rupture as compared to creep test under constant stress. A small amount of decrease in time to rupture was confirmed in case of stress reduction to 36MPa.
Consequently, there was no tendency of effect of stress reduction on creep rupture strength for both heats. The cyclic stress change did not affect the martensitic lath structure and precipitates distribution after creep rupture.
Rights:
Keyword: P91 steel, creep, cyclic stress change, creep ductility, microstructure
Date published: 2025-02-01
Publisher: Iron and Steel Institute of Japan
Journal:
- Tetsu-to-Hagane (ISSN: 00211575) vol. 111 issue. 2 TETSU-2024-114
Funding:
- 公益財団法人池谷科学技術振興財団 0351194-A (改良9Cr-1Mo鋼の⻑期応⼒変動クリープ下の材質劣化機構解明)
Manuscript type: Publisher's version (Version of record)
MDR DOI:
First published URL: https://doi.org/10.2355/tetsutohagane.tetsu-2024-114
Related item:
Other identifier(s):
Contact agent:
Updated at: 2025-02-03 12:30:27 +0900
Published on MDR: 2025-02-03 12:30:28 +0900