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Oxidation kinetics in pearlite: The defining role of interface crystallography

Authors
  • MEHTANI, HK
  • KHAN, MI
  • DURGAPRASAD, A
  • DEB, SK
  • PARIDA, S
  • PRASAD, MJNV
  • SAMAJDAR, I
Publication Date
Dec 03, 2018
Source
DSpace at IIT Bombay
Keywords
License
Unknown
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Abstract

Five different pearlitic steel wires were produced through controlled thermomechanical processing. These wires had significant (similar to 2 times) differences in the pearlite alignment and also exhibited nearly one order of magnitude difference in the oxidation kinetics. Though the nature of the oxide films was not remarkably different, the stresses in the majority hematite phase scaled with the experimentally measured oxidation rates. Careful correlation between substrate microstructure and oxide stresses established that the stresses were highest at the ferrite-cementite interface. And the interface crystallography, in case of the coarse pearlite, determined such stresses and the oxidation kinetics. (C) 2018 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.

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