Analytical Modeling on Stress Assisted Oxidation and its Effect on Creep Response of Metals

The aim of this paper was to investigate the effect of external mechanical loads on the kinetics and process of high temperature oxidation of metals or alloys through a modeling approach. In this model, the complicated interplay among the external stress, growth strain and creep strain, the oxide stress and thickness was identified. The stress accumulation in the oxide and the variation of scale thickness along with time and the effect of oxidation behavior on the creep properties of underlying metal during oxidation process can be expected. Generally, the external tensile stress would promote the growth rate of oxidation layer. Introducing a small external stress may lead to obvious changes of magnitude and state of stress in oxidation layer. At a given external stress, the creep strain rate was not kept constant due to the oxidation layer growth and stress transfer between oxidation layer and underlying metal.