Expanded austenite; from fundamental understanding to predicting composition- and stress-depth profiles

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    Abstract

    The case developing during low temperature surface hardening of austenitic stainless steel by nitriding, carburising or nitrocarburising consists of a supersaturated interstitial solid solution of nitrogen and/or carbon in austenite. The favorable properties of this so-called expanded austenite depend on the profiles of interstitial concentration and associated composition-induced residual stress over the case. In the present contribution an overview of the current state of understanding of the evolution of the microstructure, composition and residual stress during low temperature surface hardening of stainless steels is presented. The manuscript showcases the joint achievements of many co-workers in the last 18 years. The overview concerns theoretical, experimental and modelling aspects of expanded austenite, both as a homogeneous phase and as a case on stainless steel.
    Original languageEnglish
    Publication date2018
    Number of pages10
    Publication statusPublished - 2018
    Event2018 European Conference on Heat Treatment (ECHT 2018) - Friedrichshafen, Germany
    Duration: 12 Apr 201813 Apr 2018

    Conference

    Conference2018 European Conference on Heat Treatment (ECHT 2018)
    Country/TerritoryGermany
    CityFriedrichshafen
    Period12/04/201813/04/2018

    Keywords

    • Expanded austenite
    • Stainless steel
    • Residual stress
    • Numerical modelling

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