In this study, the effects of alloying elements on the adhesion of oxide scale formed on low carbon steel containing one of the elements Mn, Ni, Cr, and Mo in addition to Cu were quantitatively evaluated by the laser spallation method. The oxide scale structures, and element mapping of the containing element were obtained by SEM and EDS. Residual stress in the scales were measured by X-ray diffraction technique. The 0.3%Cu added specimen exhibited wavy interface line and the highest adhesion strength. In the Cu and Cr added specimens, an oxidized Cr layer was observed and the adhesive strength decreased compared to the 0.3%Cu added specimen. The adhesive strength of the Cu and Mo added specimens, which showed Mo-rich layer along the interface in the 2%Mo specimen and no Mo-rich layer in the 1% Mo specimen, also decreased than that of the 0.3%Cu specimen. The adhesive strength of 0.15%Ni add specimen which showed no Ni-rich area also decreased. The additional elements besides Cu may decrease the adhesive strength of the oxide scale. Measured residual stress in the scale showed different for the additional element. However, no clear correlation with adhesion strength was observed.
Suzuki et al. (Wed,) studied this question.