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Updated: Jul 2, 2025
Determining the Mechanical Strength of Ultra-Fine-Grained Metals
Published on: November 22, 2021
Combined effect of interstitial-substitutional elements on dislocation dynamics in nitrogen-added austenitic
Yasuhito Kawahara1, Shunya Kobatake2, Kenji Kaneko2
1Department of Materials, Kyushu University, 744 Motooka, Nishi, Fukuoka, 891-0395, Japan. kawahara.yasuhito.869@m.kyushu-u.ac.jp.
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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