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The effect of sulfur on the carburization of three Fe–19Ni–21Cr–xAl (x = 0, 2, 6 at.%) alloys was studied at 900 °C in three CH4–H2–H2S gases providing different sulfur pressures. For all alloys, the carbon attack decreased with an increase in the sulfur pressure, even if it was never prevented completely. However, reaction with the gas richest in H2S produced also an external chromium sulfide scale...
The effect of alloy surface roughness, achieved by different degrees of surface polishing, on the development of protective alumina layer on Fe–10at.% Al alloys containing 0, 5, and 10at.% Cr was investigated during oxidation at 1000°C in 0.1MPa oxygen. For alloys that are not strong Al2O3 formers (Fe–10Al and Fe–5Cr–10Al), the rougher surfaces increased Fe incorporation into the overall surface layer...
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