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Kolli, S.; Javaheri, V.; Kömi, J.; Porter, D. On the Role of Grain Size and Carbon Content on the Sensitization and Desensitization Behavior of 301 Austenitic Stainless Steel. Metals 2019, 9, 1193. https://doi.org/10.3390/met9111193

On the role of grain size and carbon content on the sensitization and desensitization behavior of 301 austenitic stainless steel

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Author: Kolli, Satish1; Javaheri, Vahid1; Kömi, Jukka1;
Organizations: 1Materials and Mechanical Engineering, Centre for Advanced Steels Research, University of Oulu, 90014 Oulu, Finland
Format: article
Version: published version
Access: open
Online Access: PDF Full Text (PDF, 2.7 MB)
Persistent link: http://urn.fi/urn:nbn:fi-fe2019111538233
Language: English
Published: Multidisciplinary Digital Publishing Institute, 2019
Publish Date: 2019-11-15
Description:

Abstract

The effect of grain size in the range 72 to 190 μm and carbon content in the range 0.105–0.073 wt.% on the intergranular corrosion of the austenitic stainless steel 301 has been investigated. Grain boundary chromium depletion has been studied directly using energy dispersive X-ray spectroscopy combined with scanning transmission electron microscopy and indirectly using double loop electrochemical potentiokinetic reactivation tests. In addition, chromium depletion has been modelled using the CALPHAD Thermo-Calc software TC-DICTRA. It is shown that the degree of sensitization measured using the double loop electrochemical potentiokinetic reactivation tests can be successfully predicted with the aid of a depletion parameter based on the modelled chromium depletion profiles for heat treatment times covering both the sensitization and de-sensitization or self-healing. Additionally, along with intergranular M23C6 carbides, intragranular M23C6 and Cr2N nitrides that affect the available Cr for grain boundary carbide precipitation were also observed.

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Series: Metals
ISSN: 2075-4701
ISSN-E: 2075-4701
ISSN-L: 2075-4701
Volume: 9
Issue: 11
Article number: 1193
DOI: 10.3390/met9111193
OADOI: https://oadoi.org/10.3390/met9111193
Type of Publication: A1 Journal article – refereed
Field of Science: 216 Materials engineering
Subjects:
Thermo-Calc
diffusion
grain size
precipitation
self-healing
sensitization
Article
Funding: This project 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: © 2019 by the authors. Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (http://creativecommons.org/licenses/by/4.0/).
  https://creativecommons.org/licenses/by/4.0/