Formation and stabilization of reversed austenite in supermartensitic stainless steel

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Abstract

The formation and stabilization of reversed austenite upon inter-critical annealing was investigated in a X4CrNiMo16-5-1 (EN 1.4418) supermartensitic stainless steel by means of scanning electron microscopy, electron backscatter-diffraction, transmission electron microscopy, energy-dispersive X-ray spectroscopy and dilatometry. The results were supported by thermodynamics and kinetics models, and hardness measurements. Isothermal annealing for 2 h in the temperature range of 475 to 650 °C led to gradual softening of the material which was related to tempering of martensite and the steady increase of the reversed austenite phase fraction. Annealing at higher temperatures led to a gradual increase in hardness which was caused by formation of fresh martensite from reversed austenite. It was demonstrated that stabilization of reversed austenite is primarily based on chemical stabilization by partitioning, consistent with modeling results.
Original languageEnglish
Publication date2017
Number of pages10
Publication statusPublished - 2017
Event 24th International Federation for Heat Treatment and Surface Engineering Congress (IFHTSE Congress 2017) - Nice, France
Duration: 26 Jun 201729 Jun 2017

Conference

Conference 24th International Federation for Heat Treatment and Surface Engineering Congress (IFHTSE Congress 2017)
CountryFrance
CityNice
Period26/06/201729/06/2017

Keywords

  • Supermartensitic stainless steel
  • Reversed austenite
  • Annealing treatment
  • Microstructure characterization
  • Kinetics modeling
  • Thermal stability

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