Effects of Initial Scale Structure on Transformation Behavior of Wüstite

Abstract

This study clarifies that the initial scale structure affects the transformation behavior of wüstite. The initial scale structure is controlled by limiting the temperature of nitrogen gas before the transformation of wüstite. The bilayer scale of magnetite and wüstite transforms from the magnetite/wüstite interface, while the monolayer scale of wüstite alone generates magnetite precipitates at the scale/steel interface preferentially. Furthermore, the monolayer scale takes longer to transform compared with the bilayer scale. These results indicate that the transformation behavior of wüstite can be controlled by the initial scale structure.