Regensburg 2013 – wissenschaftliches Programm
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MM: Fachverband Metall- und Materialphysik
MM 15: Poster Session
MM 15.66: Poster
Montag, 11. März 2013, 18:00–20:00, Poster E
Influence of Quenching & Partitioning on the Volume Fraction of Austenite Phase in Steel using X-ray Diffraction — •Karin Rüster1, Andre Steffen1, Michael Paulus1, Christian Sternemann1, Metin Tolan1, Niko Große-Heilmann2, Christian Kronholz2, and Andreas Peters2 — 1Fakultät Physik / DELTA, Technische Universität Dortmund, 44221 Dortmund, Germany — 2Benteler Tube Management GmbH, 33104 Paderborn, Germany
Steel is a common material in our daily life. Macroscopic characteristics (e.g. hardness, tensile properties) of steel are affected by the crystalline structure, i.e. austenite and martensite phase, which is changed during heat treatment. During the process of Quenching and Partitioning carbon diffuses from martensite to austenite and thereby stabilises the phase of austenite. This way a microstructure with retained austenite is produced. To investigate the material's characteristics XRD-experiments have been carried out at beamline BL9 of the synchrotron light source Delta, in Dortmund. A gain of retained austenite with increasing holding time is observed ex situ in pre-treated samples. Changes of the volume fraction of austenite during the process of heating and cooling were analyzed in situ. The stabilisation of austenite and an increase of the lattice constant both induced by the carbon diffusion was observed.