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Passive Film Properties of Martensitic Steels in Alkaline Environment

Influence of the Prior Austenite Grain Size

Journal Article (2022)
Author(s)

A Yilmaz (TU Delft - Team Yaiza Gonzalez Garcia, Material Innovation Institute (M2i), Nederlandse Organisatie voor Wetenschappelijk Onderzoek (NWO))

X. He (TU Delft - Intelligent Vehicles, Material Innovation Institute (M2i))

S. Pletincx (Vrije Universiteit Brussel)

T. Hauffman (Vrije Universiteit Brussel)

J Sietsma (TU Delft - Team Kevin Rossi)

Y. Gonzalez-Garcia (TU Delft - Team Yaiza Gonzalez Garcia)

Research Group
Intelligent Vehicles
Copyright
© 2022 A. Yilmaz, X. He, Sven Pletincx, Tom Hauffman, J. Sietsma, Y. Gonzalez Garcia
DOI related publication
https://doi.org/10.3390/met12020292
More Info
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Publication Year
2022
Language
English
Copyright
© 2022 A. Yilmaz, X. He, Sven Pletincx, Tom Hauffman, J. Sietsma, Y. Gonzalez Garcia
Research Group
Intelligent Vehicles
Issue number
2
Volume number
12
Reuse Rights

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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.