A new method for predicting susceptibility of austenitic stainless steels to intergranular stress corrosion cracking

Rahimi, S. and Marrow, T.J. (2020) A new method for predicting susceptibility of austenitic stainless steels to intergranular stress corrosion cracking. Materials & Design, 187. 108368. ISSN 0264-1275

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    Abstract

    Microstructures of type 304 austenitic stainless steel, produced through thermo-mechanical processing, were analysed with large area EBSD and optical image analysis assessments of the attacked grain boundary cluster after DL-EPR testing. The thermo-mechanically processed microstructures were exposed to acidified potassium tetrathionate (K2S4O6) solution under tensile stress and the lengths and distributions of the initiated intergranular crack nuclei were assessed. The crack populations were quantified by fitting a Gumbel extreme value statistics distribution to evaluate their characteristic crack length. A factor (susceptibility parameter) is introduced to rank the degree of susceptibility to intergranular stress corrosion cracking of thermo-mechanically processed microstructures. This accounts for the network connectivity of the sensitised grain boundaries, the grain size and the degree of sensitisation. Similar rankings are obtained for this susceptibility parameter and characteristic crack lengths of the assessed microstructures, in which the thermo-mechanical treatments increased the population of grain boundaries with resistance to stress corrosion cracking.

    Creators(s): Rahimi, S. ORCID logoORCID: https://orcid.org/0000-0001-6461-988X and Marrow, T.J.;
    Item type:Article
    ID code:70546
    Keywords:intergranular stress corrosion cracking (IGSCC), grain boundary character distribution, thermo-mechanical processing, grain boundary engineering (GBE), sensitisation, corrosion, Engineering design, Materials Science(all), Engineering(all)
    Subjects:Technology > Engineering (General). Civil engineering (General) > Engineering design
    Department:Faculty of Engineering > Design, Manufacture and Engineering Management > National Manufacturing Institute Scotland
    Faculty of Engineering > Design, Manufacture and Engineering Management
    Depositing user: Pure Administrator
    Date deposited:17 Nov 2019 14:52
    Last modified:06 Apr 2020 01:20
    Related URLs:
    URI:https://strathprints.strath.ac.uk/id/eprint/70546
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