Anomalous kinetics of lath martensite formation in stainless steel

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Abstract

The kinetics of lath martensite formation in Fe-17.3 wt-%Cr-7.1 wt-%Ni-1.1 wt-%Al-0.08 wt-%C stainless steel was investigated with magnetometry and microscopy. Lath martensite forms during cooling, heating and isothermally. For the first time, it is shown by magnetometry during extremely slow isochronal cooling that transformation rate maxima occur, which are interrupted by virtually transformation free temperature regions. Microscopy confirms martensite formation after athermal nucleation of clusters followed by their time dependent growth. The observations are interpreted in terms of time dependent autocatalytic lath martensite formation followed by mechanical stabilisation of austenite during the transformation process.
Original languageEnglish
JournalMaterials Science and Technology
Volume31
Issue number11
Pages (from-to)1355-1361
ISSN0267-0836
DOIs
Publication statusPublished - 2015

Keywords

  • Phase transformation kinetics
  • Martensitic phase transformation
  • Stainless steel
  • Magnetometry

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