High temperature oxidation behavior and mechanisms for S32654 were examined in air.
The molten MnMoO4-MoO3 molybdate violently damages the protective oxide layer.
Nitrogen in air plays an important role in accelerating oxidation above 1000 °C.
The lamellar Cr2N can provide short-circuit paths for Mo, Mn, O and N diffusion.
The synergism of MnMoO4-MoO3 and discontinuous Cr2N promotes catastrophic oxidation.