Three dimensional microstructure study of oxide scale formed on a high-speed steel by means of SEM, FIB and TEM

► Site-specific oxidation behaviour of a HSS was studied by FIB, SEM and TEM. ► A duplex-layer oxide scale formed after oxidation. ► Selective oxidation forms inhomogeneous surface morphology and scale thickness. ► A compact Cr-oxide sub-layer leads to a good oxidation resistance of the matrix. ► Th...

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Bibliographic Details
Published in:Corrosion science 2011-11, Vol.53 (11), p.3603-3611
Main Authors: Zhu, Q., Zhu, H.T., Tieu, A.K., Kong, C.
Format: Article
Language:English
Subjects:
A. Steel
Applied sciences
B. SEM
B. TEM
C. Oxidation
Carbides
Chromium
Corrosion
Corrosion environments
Exact sciences and technology
High speed tool steels
Metals. Metallurgy
Oxidation
Oxidation resistance
Oxides
Scale (corrosion)
Transmission electron microscopy
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Summary:► Site-specific oxidation behaviour of a HSS was studied by FIB, SEM and TEM. ► A duplex-layer oxide scale formed after oxidation. ► Selective oxidation forms inhomogeneous surface morphology and scale thickness. ► A compact Cr-oxide sub-layer leads to a good oxidation resistance of the matrix. ► The growth mechanism of oxide scale was analysed by ion diffusion. Characteristics of the oxide scale formed on a high-speed steel (HSS) material in the temperature range 550–650 °C were examined. The surface morphologies of oxidised sample indicate that the temperature has a significant influence on the oxidation behaviour of the HSS samples. Differential oxidation is expected to occur due to high-alloyed components in the material. The carbide-free matrix has a good oxidation resistance due to the dissolved chromium; while vanadium rich carbide (MC) regions were oxidised heavily because of high free energy at the carbide/matrix interface and low thermal stability of the MC carbides. FIB/TEM cross-section observation shows that the oxide scale formed on the surface has a duplex-layer structure with vanadium oxides covering the top of the scale.
ISSN:0010-938X
1879-0496
DOI:10.1016/j.corsci.2011.07.004