Evaluation of sensitization and self-healing in austenitic stainless steels based on simulations of Cr-depleted zones

Tatsuya Tokunaga, Hiroshi Ohtani, John Agren

Research output: Contribution to journalArticlepeer-review

7 Citations (Scopus)

Abstract

A simulation of the grain boundary precipitation of the Cr-rich carbide, M23C6, in austenitic stainless steels has been carried out using the DICTRA software package employing kinetic and thermodynamic databases. Our calculations reproduced the evolution of the Cr-depleted zone close to M23C6 carbide and the disappearance of the zone after a long annealing time. In addition, the calculated time- temperaturesensitization diagrams were in line with the experimental results of typical corrosion trends with annealing time. According to our results, despite the simple treatment used, a reasonable approximation for the simulations was to set the initial width of the austenite region from which the carbon was drawn as a sixth of the grain size. We also confirmed that the onset of sensitization for a steel with 0.1 mass%C shifted to shorter times and to higher temperatures compared with a steel with 0.06 mass%C.

Original languageEnglish
Pages (from-to)965-968
Number of pages4
JournalIsij International
Volume51
Issue number6
DOIs
Publication statusPublished - 2011 Jun 15

Keywords

  • Austenitic stainless steels
  • Cr-depleted zone
  • MC
  • Self-healing
  • Sensitization
  • Simulation

ASJC Scopus subject areas

  • Mechanics of Materials
  • Mechanical Engineering
  • Metals and Alloys
  • Materials Chemistry

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