Passive Film Properties of Martensitic Steels in Alkaline Environment: Influence of the Prior Austenite Grain Size

A. Yilmaz, X. He, Sven Pletincx, Tom Hauffman, J. Sietsma, Y. Gonzalez Garcia*

*Corresponding author for this work

Research output: Contribution to journalArticleScientificpeer-review

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Abstract

The role of prior austenite grain size (PAGS) on the passive layer properties of martensitic steels is studied. Electron backscatter diffraction analysis shows that PAGS between 5 and 66 µm were obtained after applying different heat treatments. The barrier properties of passive film deteriorate with grain refinement up to 28 µm, attributed to increased donor density and a decrease in the fraction of γ-Fe2O3 in passive films. However, the further refinement of PAGS to 5 µm leads to improvement in the barrier properties due to the changes within the martensite structure. This improvement stems from the increase in γ-Fe2O3 fraction.
Original languageEnglish
Article number292
Number of pages13
JournalMetals
Volume12
Issue number2
DOIs
Publication statusPublished - 2022

Keywords

  • martensitic steel
  • grain-size
  • passivity
  • electrochemical impedance spectroscopy
  • Mott-Schottky analysis
  • X-ray photoelectron spectroscopy

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