摘要
During high temperature oxidation of Fe-8.9Al-3Cr-31Mn-0.87C alloys at 1000°C, an oxidation-induced transformed α layer is observed between the γ matrix and the oxide scale. The morphology of the oxidized sample and the elemental redistribution of the constituents are evaluated using an electron microprobe. The formation of the α layer is caused by the selective oxidation of manganese, and its thickness of the α layer increases with the oxidation time and temperature. The growth of the α layer obeys a modified parabolic rate law at 1000°C. The diffusivity of manganese in the α layer at 1000°C is evaluated on the basis of the interfacial compositions at the γ/α and the α/oxide interfaces along with the proposed diffusion-related formulation. © 1989, The Electrochemical Society, Inc. All rights reserved.