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MM: Fachverband Metall- und Materialphysik
MM 25: Microstructure and Phase Transformations III
MM 25.4: Vortrag
Dienstag, 27. März 2012, 12:30–12:45, H 0106
Role of carbon atoms on the transformation behavior in the high manganese steels — •Jaebok Seol1, Changyung Park2, Pyuckpa Choi1, and Dierk Raabe1 — 1Max-Planck-Insititut für Eisenforschung, Dusseldorf, Germany — 2Dept. of Materials Science and Engineering, Pohang University of Science and Technology (POSTECH), Republic of Korea
In this study, we revealed that the γ into ε-martensitic transformation in Fe-17wt.% alloys was suppressed upon cooling by an increase in the carbon content by X-ray diffraction (XRD), electron back scattered diffraction (EBSD), and transmission electron microscopy (TEM). Also, the lattice parameter of austenite and the local distribution of stacking faults as a function of carbon composition have been observed through high resolution TEM. A direct observation method, based on a combined analysis of nano-secondary ion mass spectroscopy (nano-SIMS) and EBSD, was conducted to characterize the distribution of solute carbon in the alloys. Comparatively, atom probe tomography (APT) revealed that the inhomogeneous distribution of carbon played an important role on the austenite to ε-martensite transformation. Therefore, the segregation sites of carbon atoms in these steels were quantitatively elucidated.