Berlin 2005 – wissenschaftliches Programm
Bereiche | Tage | Auswahl | Suche | Downloads | Hilfe
DS: Dünne Schichten
DS 14: Schichtherstellung mit Laserverfahren
DS 14.1: Vortrag
Montag, 7. März 2005, 15:15–15:30, TU HS107
Laser-carburizing of iron — •Michael Kahle1, Ettore Carpene2, and Peter Schaaf1 — 1Universität Göttingen, II. Physikalisches Institut, Friedrich-Hund-Platz 1, D-37077 Göttingen, Germany — 2Dipartimento di Fisica, Politecnico di Milano, Piazza Leonardo da Vinci 32, I-20133 Milano, Italy
Laser plasma treatments in reactive atmospheres have gained a large potential for technical applications, especially for surface coatings. The work pieces can be covered with hard, resistant carbides whose amount and structure is dependent of the processing parameters: Gas-pressure, number of pulses and energy. Here we present the results for a laser treatment of pure iron in a methane atmosphere. The structural, mechanical and chemical changes of the carburized surfaces are investigated by means of Rutherford Backscattering Spectrometry (RBS), Conversion Electron / X-Ray Mössbauer Spectroscopy (CEMS/CXMS), Nanoindentation and X-Ray Diffractometry (XRD). The results such as phase formation, carbon incorporation, hardness and stress are presented. The main focus is the transformation of the hexagonal ε-carbide into the hard orthorhombic θ-carbide (cementite).