Regensburg 2007 – scientific programme

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MM: Fachverband Metall- und Materialphysik

MM 36: Nano structured materials IV

MM 36.6: Talk

Thursday, March 29, 2007, 16:00–16:15, H4

Microstructural investigations of the carbon free stainless maraging steel Corrax — •Stefan Höring, Nelia Wanderka, and John Banhart — Hahn-Meitner-Institute Berlin, Glienicker Str. 100, 14109 Berlin

Stainless maraging steels are highly alloyed precipitation hardened martensitic steels. Glass and plastic press-forming is one potential application due to their good combination of high toughness and high ductility and the absence of carbides. Precipitates of nanometre size are the reason for the high hardness of these steels. The hardening phase of the commercial alloy Corrax was chemical analysed using the 3D atom probe. The investigation after different aging times at 475°C show only one type of precipitates enriched in Ni and Al. They grow from spherical shaped particles with a size of about 3nm to plates with increasing aging times. The crystallographic structure of these precipitates was investigated with TEM/SAED. These measurements showed an ordered B2-structure. The changes in the microstructure during aging was analysed by X-ray diffraction. The content of reverted austenite in Corrax which influences the mechanical stability was analysed with diffraction methods after different heat treatments. The results are discussed with respect of the mechanical properties.