Abstract
Abstract We present a model of the thermo-mechanical state of the oxide scale developed on a metallic substrate. The model is applied to the case of (111)Ni surface oxidation. An analysis of the crystallography and the thermodynamics of the scale is performed. The calculated temperature-internal elastic field diagram shows the possibility of oxidation regimes with the loss of elastic continuity of the scale, which leads to the formation of a duplex structure. The resulting scale consists of the lower-ordered layer coherent with the substrate and the upper disordered layer, which is incoherent with the lower layer. The numerical modeling of the growth stresses together with the residual stresses in the scale is presented. The calculated average stresses after relaxation vary from 200 to −800 MPa ( σ xx component) and from 200 to −300 MPa ( σ yy component). The residual stresses vary from −400 to −1400 MPa ( σ xx ) and from −400 to −900 MPa ( σ yy ). Calculated stress profiles shows the influence of the duplex structures parameters on the stress discontinuities.
Published Version
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