Journal
MATERIALS & DESIGN
Volume 116, Issue -, Pages 8-15Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.matdes.2016.11.076
Keywords
Supermartensitic stainless steels; Phase transformation kinetics; Interface diffusion; Synchrotron radiation; Kinetics modeling; Reversed austenite
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Funding
- Danish Underground Consortium
- Danish Council for Independent Research (G.R. grant) [DFF-4005-00223]
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The martensite-to-austenite transformation in X4CrNiMo16-5-1 supermartensitic stainless steel was followed in-situ during isochronal heating at 2, 6 and 18K min(-1) applying energy-dispersive synchrotron X-ray diffraction at the BESSY II facility. Austenitization occurred in two stages, separated by a temperature region in which the transformation was strongly decelerated. The region of limited transformation was more concise and occurred at higher austenite phase fractions and temperatures for higher heating rates. The two-step kinetics was reproduced by kinetics modeling in DICTRA. The model indicates that the austenitization kinetics is governed by Ni-diffusion and that slow transformation kinetics separating the two stages is caused by soft impingement in the martensite phase. Increasing the lath width in the kinetics model had a similar effect on the austenitization kinetics as increasing the heating-rate. (C) 2016 Elsevier Ltd. All rights reserved.
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