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Combined addition of interstitial-substitutional elements has been acknowledged to contribute to the increase in the strengths of steels. For further improvements in mechanical properties, their atomic-scale interaction mechanisms with dislocations are required to be examined. In this study, both high-resolution transmission electron microscopy and atom-probe tomography were used to correlate interstitial-substitutional elements with dislocation characteristics in austenitic stainless steels. Three types of dislocation core structures are identified and associated with their strain fields as well as N and Cr atoms in the N-added steels. It is revealed that N atoms interact elastically with the dislocations, followed by the segregation of Cr atoms via the chemical interaction between N and Cr atoms. This insight significantly improves the understanding of the multiple alloying mechanism in metallic materials such as interstitial alloys and high-entropy alloys.

権利情報:

• Creative Commons BY Attribution 4.0 International
  

キーワード: Steel, 3D atom probe

刊行年月日: 2024-02-22

出版者: Springer Science and Business Media LLC

掲載誌:

• Scientific Reports (ISSN: 20452322) 4360

研究助成金:

• Japan Society for the Promotion of Science JP21J20683
• Japan Society for the Promotion of Science JP21J20683

原稿種別: 出版者版 (Version of record)

MDR DOI:

公開URL: https://doi.org/10.1038/s41598-024-54852-w

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更新時刻: 2024-11-19 16:31:08 +0900

MDRでの公開時刻: 2024-11-19 16:31:09 +0900