Papers by Keyword: Scale Adhesion

Abstract: The tensile test has been developed to assess scale adhesion of hot-rolled steel. The tensile testing machine was equipped with the CCD camera to follow the failure of scale during straining. The hot-rolled steel with different silicon content was used to investigate the scale adhesion behavior. The result is shown the mechanical adhesion energy of scale formed on the hot-rolled steel with higher Si contain was 115 J.m^-2, higher than the hot-rolled steel with lower Si contain which was 56 J.m^-2. This might be due to the presence of oxide containing Si at interface which promoted adhesion, implying that longer time for descaling would be required.

Abstract: The mechanical adhesion of thermal oxide scales formed on industrial hot-rolled steel strips produced through the electric-arc-furnace route was studied. The samples as-received steel were prepared with the specific shape fitting to the micro-tensile machine in the SEM chamber for observation of surface failure during the test. It was found that oxide transverse cracking and scale spallation are observed. This paper also presented a theoretical model for evaluate adhesion energy from strain and stress values at the first spallation. It was found that the oxide scales on the medium slab exhibited high mechanical adhesion energy. This might be due to the existence of oxide contained Si at steel-scale interfaces. It can promote adhesive interactions between steel-scale interfaces.