Micro-Indentation of oxidized low carbon steel to evaluate properties of oxides

During hot rolling process, an oxide scale grows at the surface of steel slabs. To avoid surface defects such as embedded scale at the end of the finishing mill, descaling stands are added in the production line to remove it using high-pressure water jets. Different steel grades show different desca...

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Bibliographic Details
Published inIOP conference series. Materials Science and Engineering Vol. 1270; no. 1; pp. 12106 - 12118
Main Authors Claverie-Burgué, V, Montmitonnet, P, Inal, K, Burr, A, Nicolaÿ, A, Picard, M, Settefrati, A
Format Journal Article
LanguageEnglish
Published Bristol IOP Publishing 01.12.2022
Subjects
Adhesive strength
Alloying elements
Condensed Matter
Delamination
Descaling
Engineering Sciences
Finishing mills
Finite element method
Hot rolling
Hydraulic jets
Ion beams
Low carbon steels
Materials
Materials Science
Mathematical models
Mechanics
Mechanics of materials
Oxide coatings
Physics
Production lines
Scale (corrosion)
Surface defects
Surface properties
Thermomechanical analysis
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Summary:During hot rolling process, an oxide scale grows at the surface of steel slabs. To avoid surface defects such as embedded scale at the end of the finishing mill, descaling stands are added in the production line to remove it using high-pressure water jets. Different steel grades show different descaling capacities and final surface qualities, which may depend on composition through oxide and interface toughness. The idea of this study is to measure the latter using micro-indentation to feed thermomechanical models of the descaling process. After indentation, Focused Ion Beam (FIB) is employed to observe cracking and delamination of oxidized specimen and to calculate adhesion of oxide thanks to an analytical formula. The experimental study confirms that alloying elements have a strong influence on the adhesion of oxide film and suggests that difficult-to-descale grades are those showing a large scatter of interfacial toughness. In parallel, numerical finite element (FEM) simulations of indentation are carried out using Abaqus® to have a better understanding of cracking mechanism and delamination of oxide.
ISSN:1757-8981
1757-899X
DOI:10.1088/1757-899X/1270/1/012106