Combined effect of interstitial-substitutional elements on dislocation dynamics in nitrogen-added austenitic stainless steels

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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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Kawahara, Y., Kobatake, S., Kaneko, K., Sasaki, T., Ohkubo, T., Takushima, C., & Hamada, J. I. (2024). Combined effect of interstitial-substitutional elements on dislocation dynamics in nitrogen-added austenitic stainless steels. Scientific Reports, 14(1). https://doi.org/10.1038/s41598-024-54852-w

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