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Binary Fe–(1,2,3)Si and Fe–(2,4,6)Al, and ternary Fe–(2,3)Si–(4,6)Al alloys (all in wt%) were oxidised in Ar–20% CO 2 , with and without H 2 O, at 800°C. All binary alloys except Fe–6Al, in all gases, formed a thin outer layer of Fe 3 O 4 , an intermediate Fe 3 O 4 +FeO layer, an inner FeO+Fe 2 SiO 4 (or FeAl 2 O 4 ) layer...
The oxidation and carburisation behaviour of 304 stainless steel was studied during thermal cycling in CO/CO 2 at 700°C, and also in CO/H 2 /H 2 O at 680°C. Thermal cycling caused repeated scale separation which accelerated chromium depletion from the alloy subsurface regions. The CO/CO 2 gas, with a C =7 and pO2=10-23atm., caused internal precipitation of oxides...
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