Abstract
Effect of the rare earth element yttrium on the coking behavior of Fe-based superalloy has been studied. The coking process of Fe-based superalloy during dodecane pyrolysis includes three stages – incubation period, coke protrusions growing and graphite layer stacking. Fe-based superalloy with yttrium addition exhibits the better coking and carburization resistance. The reason is that Y doped in Fe-based superalloy eliminates the intergranular coking and carburization by forming yttrium oxides to inhibit the aggregation of Cr2O3 at the grain boundary in initial period of coking behavior, thus internal Cr2O3 layer forms and effectively blocks the permeation of outer graphite.
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