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

HANDLE Open Access

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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Details 詳細情報について

  • CRID
    1050299362554034560
  • ISSN
    20452322
  • HANDLE
    2324/7169330
  • Text Lang
    en
  • Article Type
    journal article
  • Data Source
    • IRDB

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