Regensburg 2022 – wissenschaftliches Programm

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MM: Fachverband Metall- und Materialphysik

MM 16: Mechanical Properties

MM 16.4: Vortrag

Dienstag, 6. September 2022, 14:45–15:00, H44

Interplay of Cottrell atmosphere formation and carbon ordering in ferrite — •Sam Waseda, Tilmann Hickel, and Jörg Neugebauer — Max-Planck-Institut für Eisenforschung, Dusseldorf, Germany

In common steels, carbon atoms are purportedly or unintentionally added and alter mechanical properties of the steels. In ferrite, it is proposed that much of them does not stay as solid solution and ends up in the following possibilities: 1, segregate to structural defects; 2, make an elastically favorable ordered structure (Zener-ordering); 3, diffuse to other phases or form a precipitate (austenite, cementite etc.). While they are individually well studied, the interplay between these different scenarios is hardly studied. In this work, we present a density-based diffusion model to study the chemical and elastic interactions between Fe and C as well as among C, in order to understand the interplay between the formation of Cottrell atmospheres and the Zener-ordering.