Effect of processing on microstructural features and mechanical properties of a reduced activation ferritic/martensitic EUROFER steel grade

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Authors

Institutes & Expert groups

  • OCAS - OnderzoeksCentrum voor de Aanwending van Staal - Belgium
  • UGent - Universiteit Gent
  • TUD - Delft University of Technology

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DOI

Abstract

The microstructure of a 9Cr-1W-0.22V-0.09Ta-0.11C reduced activation ferritic/martensitic (RAFM) steel has been investigated after thermo-mechanical rolling with subsequent annealing for 30 min at temperatures of 880 C, 920 C, 980 C and 1050 C, followed by water quenching. Scanning and transmission electron microscopy investigations and electron backscattered diffraction (EBSD) measurements were performed to determine the microstructural features after the different thermal treatments. Additionally, the microstructure and the mechanical properties of the materials were studied after tempering at 750 C for 2 h. This study aims to understand microstructural processes that occur in the material during thermo-mechanical treatment and to assess the effect of the microstructure on its strength and toughness, with a view on improving its mechanical performance. Microstructural analysis together with the data from mechanical tests identified the beneficial effect of grain refinement obtained with adequate processing on the ductile-to-brittle transition temperature (DBTT) and on the delay of strength degradation at elevated temperatures.

Details

Original languageEnglish
Pages (from-to)1-9
Number of pages9
JournalJournal of Nuclear Materials
Volume494
DOIs
StatePublished - 4 Jul 2017

Keywords

  • EUROFER , RAFM

ID: 4828035