書誌事項
- タイトル別名
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- Change in Charpy Impact Toughness and Carbide Precipitation after Aging Heat Treatment of High Mn Austenitic Steel
- Change in Charpy impact toughness and carbide precipitation after ageing heat treatment of high Mn austenitic steel
説明
High-Mn austenitic steel is expected to be a next-generation structural material for cryogenic use by maintaining a stable fcc crystal structure even at cryogenic temperature by adding a large amount of C and Mn which are γ-stabilizing elements. In some cases, Cr is added together with C as a solid solution strengthening element to the high-Mn austenitic steel. Depending on the conditions of aging heat treatment, the formation of Cr carbide may affect the mechanical properties. In this study, the formation behavior of Cr carbide and the effect on cryogenic Charpy impact toughness in the aging heat treatment at from 773 to 1273K for 30s to 18ks of a high-Mn austenitic steel with 0.5%C-25%Mn-5%Cr. Regardless of the aging heat treatment conditions, no cleaved but 100% ductile fracture surface was observed in all samples after the Charpy impact test at 77K. On the other hand, M23C6 containing Cr was formed on the austenite grain boundaries in the sample aged for a long time at 1073K, and the Charpy absorbed energy showed lower than those of the other aging conditions. As the results of both detailed microstructure observation of M23C6 and adjacent austenite matrix and DICTRA simulation, it was clarified that M23C6 mainly act as a fracture initiation point but propagation to the matrix becomes ductile because no sharp alloy deficiency layer is formed at the M23C6 / austenite matrix interface. As a result of calculation of stacking fault energy using a thermochemical model, it was confirmed that γ stability at cryogenic temperature could be sufficiently secured even in the alloy-deficient region near M23C6 as well as in the stable matrix.
収録刊行物
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- 溶接学会論文集
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溶接学会論文集 38 (4), 199-210, 2020
一般社団法人 溶接学会
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キーワード
詳細情報 詳細情報について
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- CRID
- 1391131406293060736
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- NII論文ID
- 130007961124
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- ISSN
- 24348252
- 17542138
- 02884771
- 09507116
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- 本文言語コード
- ja
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- データソース種別
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- JaLC
- Crossref
- CiNii Articles
- OpenAIRE
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- 抄録ライセンスフラグ
- 使用不可
