Abstract
The present article describes the finite element analysis of mechanical evolution during high temperature oxidation of a metallic alloy. The concerned phenomena are the stress evolutions with time and space in Ni30Cr + Cr2O3 system during oxidation in the range 800–1000 °C. The forming of an oxide layer on chromium-based alloys in oxidizing environments for high temperature applications provides a good protection against further oxidation. During this oxidation, stresses develop in both oxide layer and metallic substrate, which may cause further layer cracking or spallation and limit the lifetime of alloys in such a challenging environment. In order to investigate the stress distributions, a full thermomechanical model is implemented in the commercial finite element software Abaqus/Standard through a UMAT FORTRAN subroutine. The time-dependent stress is especially calculated and compared to experimental results from bibliography. Different temperatures are considered to estimate their influence on the different phenomena and quantities of the mechanical state. Numerical values of stresses as well as for material parameters are provided in this study.
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