Berlin 2012 – scientific programme

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MM: Fachverband Metall- und Materialphysik

MM 7: Transport and Diffusion II

MM 7.3: Talk

Monday, March 26, 2012, 12:00–12:15, H 1029

Simulation of internal nitradation phenomena with a cellular automata approach — •Katrin Jahns, Martin Landwehr, Jürgen Wübbelmann, and Ulrich Krupp — University of Applied Sciences Osnabrück, Faculty of Engineering and Computer Science, Albrechtstrasse 30, 49076 Osnabrück, Germany

In this study a simulation program is developed for predicting precipitation accompanying diffusion processes based on the method of cellular automata. Hereby, nitrogen diffusion and precipitate formation are simulated individually and in combination. Operation of high-temperature components as well as surface hardening processes, e.g., carburizing and nitridation, involve diffusion of gases in metals and alloying elements, precipitate nucleation and growth. The higher specific volume of the internal precipitates as compared to the substrate causes the generation of residual compressive stresses in the surface layer. Besides thermodynamics, these effects are taken into account when evolving the program. The simulation program is evaluated and verified by means of thermogravimetric nitridation and carburization experiments.