In situ investigation of the martensitic transformation in Fe–12 wt.%Ni–0.6 wt.%C steel at subzero temperatures

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Abstract

Martensitic transformation in a Fe–12 wt.%Ni–0.6 wt.%C alloy was investigated with magnetometry and in situ (synchrotron) X-ray diffraction at sub-zero Celsius temperature. In situ X-ray diffraction at the HZBBESSY II synchrotron facility was applied to quantitatively determine the fractions of retained austenite and martensite formed during: (i) isochronal transformation, while cooling at a rate of 3 K/min from room temperature to 138 K, and (ii) isothermal transformation, while holding at 138 K. X-ray diffraction analysis was also used for a qualitative evaluation of the stress evolution in austenite during the transformation. Magnetometry was applied to monitor the overall kinetics for the same isochronal and
isothermal transformations. The results are discussed in the light of the current theories on martensitic
transformations.
Original languageEnglish
JournalJournal of Alloys and Compounds
Volume577
Issue numberSupplement 1
Pages (from-to)S543-S548
ISSN0925-8388
DOIs
Publication statusPublished - 2013

Keywords

  • Phase transformation
  • Magnetometry
  • X-ray diffraction
  • Martensite
  • Retained austenite

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