Abstract
This study involved cyclic carburization exposures of three Fe-base alloys (310SS, 800HT, and 556) at 800°C in 2% CH 4 /H 2 and at 1,100°C in 10% CH 4 /H 2 carburizing gas mixtures for 500h. Carburization thermodynamics, kinetics, and carburization behavior are discussed. The exposure at 800°C in 2% CH4/H2 was mixed oxidizing/carburizing, but reducing carburizing at 1,100°C in 10% CH4/H2. At 800°C Fe-base alloys suffered external carburization and oxidation, and the external Cr-rich scale layers were continuous consisting of oxides and carbides. Carburization resistance primarily depends on the protection afforded by external continuous layers rather than Ni content. At 1,100oC, extensive external carburization occurred, and external layers became discontinuous consisting of Cr/Fe-carbides or metallic CrFe phases. Carburization resistance depends greatly on Ni (Co) content.
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