Microstructural Development and Fracture of SUS304 Jig under Gas Nitriding and Gas Nitrocarburizing
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- Luan Ngo Huynh Kinh
- ITOH KIKOH Co., Ltd.
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- Yamamoto Kaoru
- Department of Materials System Engineering, National Institute of Technology, Kurume College
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- Okuyama Tetsuya
- Department of Materials System Engineering, National Institute of Technology, Kurume College
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- Nakayama Masaru
- Department of Materials Science and Engineering, National Institute of Technology, Kurume College
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- Kudo Masaki
- The Ultramicroscopy Research Center, Kyushu University
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- Koizumi Koreaki
- ITOH KIKOH Co., Ltd.
Bibliographic Information
- Other Title
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- ガス窒化およびガス軟窒化の環境下でのSUS304治具のミクロ組織変化と破断
Description
<p>The microstructural change and fracture by repeated gas nitriding and gas nitrocarburizing of SUS304 jig were investigated in this study. It was found that an oxide layer which was formed owing to high-temperature oxidation of the microstructure near the surface, was easily detached from the surface layer. Also, many micro voids in the oxide layer were observed. Beneath the oxide layer, a compound layer containing mainly nitrides was identified. A carbon diffusion region was observed in the matrix adjacent to the interface between the compound layer and the matrix. It was considered that the fine voids and uneven surfaces induced under loading stress during both treatments were the crack initiation points, which coalesced for the development of cracking. The fractured surface exhibits a sequence of brittle and ductile fracture patterns as the microstructure changes from the surface to the interior.</p>
Journal
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- Journal of the Japan Institute of Metals and Materials
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Journal of the Japan Institute of Metals and Materials 88 (1), 16-25, 2024-01-01
The Japan Institute of Metals and Materials
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Details 詳細情報について
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- CRID
- 1390580063061996032
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- ISSN
- 18806880
- 24337501
- 00214876
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- Text Lang
- ja
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- Data Source
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- JaLC
- Crossref
- OpenAIRE
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- Abstract License Flag
- Disallowed
