Modeling Internal Oxidation of Binary Ni Alloys

Abstract

A numerical model is presented to simulate the diffusional transport of oxygen and that of an alloying element, within a 1-D binary Ni alloy, leading to the selective oxidation of the alloying element and the formation of an internal oxide precipitate. This specific model is written in MATLAB and, with the aid of the Matlab Toolbox, is coupled to the ThermoCalc extensive database. A reaction time is introduced to overcome problems related to the difficulty of formation of the internal oxide. Two cases are considered: Al as the alloying element for which the solubility product of the oxide forming elements is small, and Mn for which it is large.

Numerical Analysis of Diffusion-Controlled Internal Corrosion by the Cellular Automata Approach

“…A very well-known approach is the application of the finite-difference method (FDM) which was applied to carburization, internal oxidation and internal nitridation, e.g., by Bongartz et al [4]. Sockel and Christ [5], Li and Morral [6], and coupled with computational thermodynamics (CALPHAD, calculation of phase diagrams) by Zimbitas and Sloof [7] and Krupp et al [8]. As another technique, the phase-field approach (PF) was applied by Wen et al [9] to model onedimensional corrosion kinetics with simplified model parameters, and by Shen et al for precipitate formation in binary Ni-Al alloys [10].…”

Numerical analysis of high temperature internal corrosion mechanisms by the cellular automata approach

“…This method was applied to carburization, internal oxidation and internal nitridation, e.g., by Bongartz et al . Sockel and Christ , Li and Morral , and coupled to thermodynamic software by Zimbitas and Sloof (in combination with ThermoCalc) and Krupp et al (in combination with ChemApp) .…”