Passive Film Properties of Martensitic Steels in Alkaline Environment

Influence of the Prior Austenite Grain Size

Journal article (2022)

Authors

A. Yilmaz Material Innovation Institute (M2i), Team Yaiza Gonzalez Garcia - Mechanical, Maritime and Materials Engineering , Nederlandse Organisatie voor Wetenschappelijk Onderzoek (NWO)
X. He Intelligent Vehicles - Mechanical, Maritime and Materials Engineering , Material Innovation Institute (M2i)
S. Pletincx Vrije Universiteit Brussel
Tom Hauffman Vrije Universiteit Brussel
J. Sietsma Team Kevin Rossi - Mechanical, Maritime and Materials Engineering
Y. Gonzalez Garcia Team Yaiza Gonzalez Garcia - Mechanical, Maritime and Materials Engineering
Research Group
Intelligent Vehicles (Mechanical, Maritime and Materials Engineering) (TU Delft)
Copyright: © 2022 A. Yilmaz, X. He, Sven Pletincx, Tom Hauffman, J. Sietsma, Y. Gonzalez Garcia
DOI: https://doi.org/10.3390/met12020292
More Info
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Published Date

2022

Language

English

Faculty

Mechanical, Maritime and Materials Engineering

Department

Cognitive Robotics

Research Group

Intelligent Vehicles

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.