On the Selective Oxidation of a 0.15C-6Mn-2Al-1Si Third-Generation Advanced High Strength Steel During Two-Stage Annealing Treatments

The selective oxidation of a 0.15C-5.6Mn-1.9Al-1.1Si (wt pct) prototype third-generation advanced high-strength steel during dew point-controlled two-stage annealing with intermediate flash pickling was documented. After austenitization annealing at 1163 K for 600 s, the surfaces had compact nodules of MnO on top of co-precipitated nodules of MnSiO3/Mn2SiO4 and MnAl2O4. The intermediate flash pickling treatment dissolved the external MnO and …