Evolution of compressive strains in retained austenite during sub-zero Celsius martensite formation and tempering

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Abstract

The development of martensite during sub-zero Celsius treatment of a 1 wt.% C, 1.6 wt.% Cr steel was investigated by in situ and ex situ (synchrotron) X-ray diffraction at the synchrotron facility HZB-BESSY II in order: (i) to quantitatively assess the fractions of retained austenite and martensite; (ii) to measure the evolution of the lattice strain in retained austenite; and (iii) to identify the different stages of tempering. This work shows for the first time that the compressive strains built up in austenite upon martensite formation during sub-zero Celsius treatment are retained after tempering. Furthermore, it is demonstrated that sub-zero Celsius treatment after tempering leads to compressive strain in austenite. Finally, it is reported that no compressive strain builds up in austenite when the martensite formation occurs below a certain critical temperature.
Original languageEnglish
JournalActa Materialia
Volume65
Pages (from-to)383-392
ISSN1359-6454
DOIs
Publication statusPublished - 2014

Keywords

  • Steel
  • (Synchrotron) X-Ray Diffraction
  • Retained austenite
  • Sub-zero Celsius treatment

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