Berlin 2005 – scientific programme
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DS: Dünne Schichten
DS 24: Postersitzung II
DS 24.26: Poster
Tuesday, March 8, 2005, 17:00–19:00, Poster TU B
Laser-carburizing of austenitic stainless steel — •Michael Kahle1, Ettore Carpene2, Salvatore Cusenza1, 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
Austenitic stainless steel is still an interesting material. Its grand corrosion properties are superimposed by the poor wear properties. 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. 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. A comparison with magnetron-sputtered austenitic stainless steel will be given. The main focus is the supersaturated fcc-structure (expanded austenite).