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Model alloys Fe-9Cr, Fe-20Cr (wt.%) and these alloys doped with 2%Mn or 0.5%Si were exposed to Ar-20%CO2-20%H2O-(0, 0.5)%SO2 (vol.%) gas at 811°C for up to 500h. The Fe-9Cr and Fe-9Cr–2Mn underwent breakaway oxidation in both gases. The Fe-9Cr-0.5Si developed Cr2O3 scale in sulphur-free gas, but entered breakaway in sulphur-bearing gas. The Fe-20Cr developed Cr2O3 scale, with the growth rate being...
Model alloys, Fe–9Cr, Fe–9Cr–2Mn and Fe–9Cr–0.5Si (wt%) were exposed to Ar–20%CO2–20%H2O–(0, 0.1, 0.5 and 1.0%)SO2 gases at 650°C. In the absence of SO2, all alloys grew thick iron-rich oxide scales. Adding SO2 led to partial passivation by chromia formation on Fe–9Cr and Fe–9Cr–0.5Si, but not the Fe–9Cr–2Mn. Alloy carburisation was extensive in sulphur-free gas, but substantially suppressed by SO...
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