Descaling Abilities of Two Low-Alloy High-Strength Steels Under Different Heating Processes
Springer Science and Business Media LLC - Trang 1-12 - 2023
Tóm tắt
This study investigated two low-alloy steels with the same alloying elements in different contents. The relationship between the structure and properties of the oxide scale formed on the surface of the billet at 950–1200 °C was studied. The enrichment of Si and Cr alloy elements at the interface of the steel matrix and oxide scale to form a spinel-structure compound under the same heating process reduced the oxidation kinetics of the oxide scale. The relationship between the adhesion strength of the scale and the substrate of steels was quantitatively characterized at different temperatures using a pull-type adhesion tester. The results showed that the adhesion strength of the oxide scale depended on the difference between the elastic modulus of the substrate. The interfacial constraint coordination deformation ability of the oxide scale was worse for a larger difference. The mixed phase of Fe2SiO4/FeO and FeCr2O4/FeO reached the melting point and melted when the heating temperature exceeded 1200 °C. Subsequently, the liquid phase was immersed into the lattice void of the matrix metal under external forces. Consequently, the external stress was dispersed, and the peeling effect of the oxide scale was inhibited.
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