University of Oulu

Satish Kolli, Vahid Javaheri, Thomas Ohligschläger, Jukka Kömi, David Porter, The importance of steel chemistry and thermal history on the sensitization behavior in austenitic stainless steels: Experimental and modeling assessment, Materials Today Communications, Volume 24, 2020, 101088, ISSN 2352-4928,

The importance of steel chemistry and thermal history on the sensitization behavior in austenitic stainless steels : experimental and modeling assessment

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Author: Kolli, Satish1; Javaheri, Vahid1; Ohligschläger, Thomas2;
Organizations: 1Materials and Mechanical Engineering, Centre for Advanced Steels Research, University of Oulu, 90014, Finland
2VTT Technical Research Centre of Finland, Finland
Format: article
Version: published version
Access: open
Online Access: PDF Full Text (PDF, 6.3 MB)
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Language: English
Published: Elsevier, 2020
Publish Date: 2020-06-08


The sensitization of austenitic stainless steels is dependent on various factors such as chemical composition, heat treatment temperature and time. To study these effects, the degree of sensitization in five austenitic stainless steel compositions that were subjected to isothermal heat treatments in the temperature range 550–820 °C has been determined using double loop electrochemical potentiokinetic reactivation testing. The nucleation and growth of grain boundary M23C6 carbides, that are responsible for sensitization, has been modelled with the help of the precipitation and diffusion modules in Thermo-Calc, assuming local multicomponent equilibrium, flux balance at the carbide-matrix interface, to quantitatively predict the Cr depletion. Based on the Cr depletion characteristics, a depletion parameter has been established that can predict sensitization in austenitic stainless steels and predict the effects of individual alloying elements.

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Series: Materials today communications
ISSN: 2352-4928
ISSN-E: 2352-4928
ISSN-L: 2352-4928
Volume: 24
Article number: 101088
DOI: 10.1016/j.mtcomm.2020.101088
Type of Publication: A1 Journal article – refereed
Field of Science: 216 Materials engineering
Funding: The authors are grateful for the this project that has received funding from the European Union’s Horizon 2020 research and innovation programme under the Marie Skłodowska-Curie grant agreement No 675715.
EU Grant Number: (675715) MIMESIS - Mathematics and Materials Science for Steel Production and Manufacturing
Copyright information: © 2020 The Authors. Published by Elsevier Ltd. This is an open access article under the CC BY-NC-ND license (