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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