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

Xiaolin Li, Sven Pletincx, Tom Hauffman, Jilt Sietsma, Yaiza Gonzalez-Garcia

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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.

Originele taal-2English
Artikelnummer292
Aantal pagina's13
TijdschriftMetals
Volume12
Nummer van het tijdschrift2
DOI's
StatusPublished - 8 feb 2022

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