Oxidation induced phase transformation of duplex stainless steel 25Cr–10Mn–2Ni–3Mo–0.8W–0.8Cu–0.5N

Abstract Isothermal oxidation behaviour of duplex stainless steel 25Cr–10Mn–2Ni–3Mo–0.8W–0.8Cu–0.5N was investigated at 1050 °C in air through scanning electronic microscopy and Raman spectroscopy. The weight gain per unit area was in parabolic relation to oxidation time with a parabolic rate constant ( k p ) 1.39 × 10 −12 g 2 mm −4 min −1 . An oxidation induced transformed ferrite diffusion layer was observed due to the preferential oxidation of manganese.