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M: Metallphysik

M 47: Mechanische Eigenschaften III

M 47.4: Vortrag

Dienstag, 8. März 2005, 15:30–15:45, TU H111

Mechanical properties of macro-alloyed, single-phase D03-ordered iron aluminides — •Johannes Deges — Max-Planck-Institut für Eisenforschung GmbH, Max-Planck-Str.1 40237 Düsseldorf

Iron aluminides exhibit an excellent corrosion and oxidation resistance in the range of the operating temperatures of steam turbines. Therefore, they possess a high potential as a low cost alternative to conventional ferritic, martensitic or austenitic steels. For the application as a structural material the improvements of the mechanical properties, such as room temperature ductility and strength at temperatures above 600^∘C are necessary. In the framework of a systematic alloy development different Fe3Al-based alloys with ternary additions of transition metals: Ti, V, Nb, Ta, Cr, Mo, W, Mn, Co, Ni, Cu have been produced by vacuum induction melting. The influence of the alloying elements on the mechanical properties like warm strength and plastic elongation at room temperature have been investigated in the as-cast condition and after a defined D03-ordering heat treatment. The first results show that low concentrations of the alloying elements have a strong influence on the stress-strain behaviour as well as the fracture mode.