Combined effect of interstitial-substitutional elements on dislocation dynamics in nitrogen-added austenitic stainless steels
Abstract 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...
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Nature Portfolio
2024-02-01
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Series: | Scientific Reports |
Online Access: | https://doi.org/10.1038/s41598-024-54852-w |
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author | Yasuhito Kawahara Shunya Kobatake Kenji Kaneko Taisuke Sasaki Tadakatsu Ohkubo Chikako Takushima Jun-ichi Hamada |
author_facet | Yasuhito Kawahara Shunya Kobatake Kenji Kaneko Taisuke Sasaki Tadakatsu Ohkubo Chikako Takushima Jun-ichi Hamada |
author_sort | Yasuhito Kawahara |
collection | DOAJ |
description | Abstract 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. |
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format | Article |
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institution | Directory Open Access Journal |
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language | English |
last_indexed | 2024-03-07T15:04:51Z |
publishDate | 2024-02-01 |
publisher | Nature Portfolio |
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series | Scientific Reports |
spelling | doaj.art-fd09577dc36946c3abf564349a6bee3b2024-03-05T18:57:00ZengNature PortfolioScientific Reports2045-23222024-02-011411910.1038/s41598-024-54852-wCombined effect of interstitial-substitutional elements on dislocation dynamics in nitrogen-added austenitic stainless steelsYasuhito Kawahara0Shunya Kobatake1Kenji Kaneko2Taisuke Sasaki3Tadakatsu Ohkubo4Chikako Takushima5Jun-ichi Hamada6Department of Materials, Kyushu UniversityDepartment of Materials, Kyushu UniversityDepartment of Materials, Kyushu UniversityNational Institute for Materials ScienceNational Institute for Materials ScienceResearch & Development Center, Nippon Steel Stainless Steel CorporationResearch & Development Center, Nippon Steel Stainless Steel CorporationAbstract 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.https://doi.org/10.1038/s41598-024-54852-w |
spellingShingle | Yasuhito Kawahara Shunya Kobatake Kenji Kaneko Taisuke Sasaki Tadakatsu Ohkubo Chikako Takushima Jun-ichi Hamada Combined effect of interstitial-substitutional elements on dislocation dynamics in nitrogen-added austenitic stainless steels Scientific Reports |
title | Combined effect of interstitial-substitutional elements on dislocation dynamics in nitrogen-added austenitic stainless steels |
title_full | Combined effect of interstitial-substitutional elements on dislocation dynamics in nitrogen-added austenitic stainless steels |
title_fullStr | Combined effect of interstitial-substitutional elements on dislocation dynamics in nitrogen-added austenitic stainless steels |
title_full_unstemmed | Combined effect of interstitial-substitutional elements on dislocation dynamics in nitrogen-added austenitic stainless steels |
title_short | Combined effect of interstitial-substitutional elements on dislocation dynamics in nitrogen-added austenitic stainless steels |
title_sort | combined effect of interstitial substitutional elements on dislocation dynamics in nitrogen added austenitic stainless steels |
url | https://doi.org/10.1038/s41598-024-54852-w |
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