文档介绍：SIMULATION OF THERMODYNAMICS AND ICS OF INTERNAL CORROSION OF ENGINEERING ALLOYS AT HIGH-TEMPERATURES
V. B. Trindade1, U. Krupp1, H.-J. Christ1, S. Yang1, J. Gegner1,2
1 Institut für Werkstofftechnik / University of Siegen, Paul-Bonatz-Str. 9-11,
57068 Siegen - Germany
2 Werkstoff-Physik / SKF GmbH, Ernst-Sachs-Str. 5, 97424 Schweinfurt - Germany
A reasonable prediction of the service life of structures or equipments operating at high-temperatures in aggressive atmospheres requires a full understanding of the degradation mechanisms of the material due to mechanical loading and corrosion. The overall objective of this study is to simulate high-temperature corrosion processes under near-service conditions, which requires both, a thermodynamic model to predict phase stabilities for given conditions and a mathematical description of the process ics, ., solid state diffusion. puter program was developed in which the thermodynamic program library ChemApp is integrated into a numerical finite-difference diffusion calculation to treat internal oxidation, nitridation and sulfidation processes in mercial alloys. The model is capable to simulate multi-phase internal corrosion processes controlled by solid-state diffusion into the bulk metal as well as intergranular corrosion occurring in low-alloy steels by fast inward oxygen transport along the grain boundaries of the substrate.