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On the effect of pre-oxidation on the kinetics of gaseous nitriding of iron

ASM International
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  • Materials Technology


Preheating in an oxidising atmosphere is frequently used prior to gaseous nitriding. The effects of this preoxidation have been investigated and it is found that a preoxidation decrease the incubation time for the nucleation of iron nitrides. This results in a more homogeneous nucleation of iron nitrides, which leads to a more uniform thickness of the compound layer. A second effect is a thicker compound layer, which may stem from a higher surface concentration.

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