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Evaluation of Sensitization and Self-Healing in Austenitic Stainless Steels Based on Simulations of Cr-Depleted Zones
KTH, School of Industrial Engineering and Management (ITM), Materials Science and Engineering, Physical Metallurgy.
2011 (English)In: ISIJ International, ISSN 0915-1559, Vol. 51, no 6, 965-968 p.Article in journal (Refereed) Published
Abstract [en]

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-temperature-sensitization 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 01 mass%C shifted to shorter times and to higher temperatures compared with a steel with 0.06 mass%C.

Place, publisher, year, edition, pages
2011. Vol. 51, no 6, 965-968 p.
Keyword [en]
sensitization, self-healing, simulation, Cr-depleted zone; M(23)C(6), austenitic stainless steels
National Category
Metallurgy and Metallic Materials
URN: urn:nbn:se:kth:diva-36869ISI: 000292225400016ScopusID: 2-s2.0-80054083656OAI: diva2:431640
QC 20110721Available from: 2011-07-21 Created: 2011-07-18 Last updated: 2011-07-21Bibliographically approved

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