Tailoring oxidation resistance of Super304H by controlling Mn content

다국어 초록 (Multilingual Abstract)

<P><B>Abstract</B></P> <P>The effects of Mn on oxidation resistance of Fe-18Cr-8.5Ni-3.5Cu-0.5Nb-0.1C-0.1 N-(0.08–2.05 wt%)Mn alloys were investigated by isothermal oxidation in ambient air at 700 °C for up to 8 weeks. The Mn addition up to 0.44 wt% increased the oxidation resistance, but further addition decreased it, thus the best oxidation resistance was obtained in the alloy with 0.44 wt% Mn. Mn promoted the internal oxidation and changed the Mn and Cr concentrations of the inner oxide layer. The best oxidation resistance of the alloy with 0.44 wt% Mn was attributed to the improved protectiveness of the inner oxide layer having the highest Cr content.</P> <P><B>Highlights</B></P> <P> <UL> <LI> Effects of Mn (0–2 wt%) on oxidation resistance of Super304H were examined. </LI> <LI> Addition of Mn up to 0.44 wt% increased the oxidation resistance. </LI> <LI> Further addition of Mn up to 2.05 wt% accelerated the oxidation. </LI> <LI> The best oxidation resistance was obtained in the alloy with 0.44 wt% Mn. </LI> <LI> Alloying Mn changed Mn and Cr contents of the internal oxide layer. </LI> </UL> </P>