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M: Metallphysik
M 41: Postersitzung
M 41.18: Poster
Donnerstag, 27. März 2003, 14:30–16:30, HSZ
Finite Element Simulation of Carburization and Decarburization Processes — •Jürgen Gegner1 and Andreas Öchsner2 — 1SKF GmbH, Department of Materials Physics, Ernst-Sachs-Strasse 5, D-97424 Schweinfurt — 2Institute of Applied Mechanics, University of Erlangen-Nuremberg, Egerlandstrasse 5, D-91058 Erlangen
Carbon-diffusion controlled processes are of great technical importance to iron and steel manufacturing and heat treatment. Carburization yields components with tough core and high rim strength that show excellent fatigue and wear resistance. However, decarburization of steel, i.e. carbon loss caused by surface oxidation in contaminated atmospheres, may result in both lower hardness and tensile residual stress in the rim zone. Due to economic significance, industry demands on mathematical models, which predict realistic concentration profiles. As analytical solutions are of limited aptitude, the authors present a universal numerical simulation tool based on the finite element method (FEM) and a refined diffusion model that considers scaling, variable surface carbon concentrations, ferrite-austenite phase transformation, and concentration-dependent diffusivity. A standard programme system was used to ensure industrial applicability. In order to demonstrate the versatile possibilities of the new tool, carbon distributions were calculated on different heat treatment conditions and compared with measured depth profiles.