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- KAWAGOISHI Norio
- Kagoshima University
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- NAGANO Takanori
- National Institute of Technology, Miyakonojo College
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- NAKAMURA Yuzo
- Kagoshima University
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- KARIYA Kohji
- Dai-ichi Institute of Technology
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- IWAMOTO Ryuichi
- Kagoshima Prefectural Institute of Industrial Technology
Bibliographic Information
- Other Title
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- ショットピーニング加工したマルエージング鋼における表層組織と疲労特性
Abstract
<p>Rotating bending fatigue tests were carried out to investigate the effect of microstructure in subsurface on the fatigue properties of a shot peened maraging steel. The steel had a fine-grained microstructure formed at the surface layer with 50-70 μm in depth. Especially a thin surface layer showed a nano-size structure. A surface fracture occurred at high stress levels, while the combined fracture occurred due to coalescence of a surface crack and an internal one initiated independently with decreasing in stress level until 108 cycles. In all of the macroscopic fracture surfaces in the shot-peened specimen, a ring-shaped flat area was observed at the surface layer irrespective of the fracture mode and the depth of the area nearly corresponded to the one of the fine-grained microstructure. The formation mechanism of the ring-shaped area was explained from the initiation and propagation properties of a surface crack in the surface layer in connection with the microstructure.</p>
Journal
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- The Proceedings of the Materials and Mechanics Conference
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The Proceedings of the Materials and Mechanics Conference 2022 (0), OS0313-, 2022
The Japan Society of Mechanical Engineers
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Details 詳細情報について
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- CRID
- 1390014093884689664
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- ISSN
- 24242845
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- Text Lang
- ja
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- Data Source
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- JaLC
- Crossref
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- Abstract License Flag
- Disallowed