A laser Raman microscope was used to collect spectra from individual phase regions visible in a polished cross-section of a thick oxide scale grown on a steel at high temperature. The technique was shown to be capable of unambiguously distinguishing the three iron oxides, FeO, Fe3O4, and Fe2O3. The standard spectra were then used to analyse the phases within thin (<10 μm) millscales developed on the steel during the hot rolling stage of steel strip production. Poor quality surface appearance was demonstrated to be associated with the development of fragmentary Fe2O3 regions.
|Number of pages
|Materials Science and Technology
|Published - 1 May 1998