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

12 Downloads (Pure)

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

Fingerprint

Dive into the research topics of 'Passive Film Properties of Martensitic Steels in Alkaline Environment: Influence of the Prior Austenite Grain Size'. Together they form a unique fingerprint.

Cite this