Time Evolution of Early AHSS Oxidation
(Room 310)
06 May 19
2:30 PM
-
3:00 PM
This work examined how selective oxides evolve over time under conditions typically encountered during continuous annealing. Selective oxidation can lead to surface oxides that inhibit galvanized coating adherence. The oxides that form are determined by alloy chemistry and annealing furnace conditions. Surface oxide growth and morphology of a CMnSi grade of advanced high-strength steel (AHSS) were examined after oxidation for 0, 30, 60, 90, 120 seconds at 850°C in controlled dewpoint atmospheres. Characterization of internal and external oxide morphology, chemistry and depth was conducted with scanning electron microscopy/energy-dispersive x-ray spectroscopy (SEM/EDS) and transmission electron microscopy (TEM)/EDS techniques. The effects of time and dewpoint on these variables were examined.