Alloy depletion profiles during non-protective oxidation

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Abstract

The theory developed in this paper considers the depletion produced by the selective oxidation of an alloy which oxidizes under non-protective conditions and exhibits linear oxidation kinetics. The development is applicable to the case where a pre-existing depletion profile exists within the alloy prior to the advent of non-protective conditions and, thus, is of relevance to the behaviour of a metal substrate after spallation of a protective oxide. Detailed calculations are presented which demonstrate the perturbation to this profile as a function of the recession rate of the oxide-metal interface. The size of the perturbation zone is found to be independent of the velocity of the oxidation front at low values but approaches zero at higher velocities. A limited comparison of the theory is made on a 20 Cr-25 Ni stainless steel in which a pre-existing chromium depletion profile had been produced by vacuum annealing.

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