Abstract
The early stages of the oxidation‐decarburization kinetics have been investigated for austenitic iron alloys of carbon contents 0.23–1.07 w/o exposed to carbon dioxide‐carbon monoxide atmospheres at the temperature of 950°C. Complex reaction behavior was observed for these alloys in the range 10–100 v/o carbon dioxide. The initial selective oxidation of carbon from sheet specimens exhibited linear kinetics. During late stage scale growth of wustite crystals, decarburization occurred by gaseous transport of carbon oxides through pores in the oxide. An oxidation‐decarburization model based on surface controlled reaction steps accounted most adequately for decarburization and wustite formation before onset of control by diffusion processes.
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