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Some high manganese austenitic steels show extraordinarily high ductility due to twinning induced plasticity (TWIP). The TWIP-effect is based on the formation of crystal twins in the austenitic lattice structure as a response to mechanical strain resulting in an extraordinary high ductility. Therefore, TWIP steels are very interesting for forming processes like deep drawing. Within the collaborative research center 747 (SFB 747 “Mikrokaltumformung”) of the German Research Foundation (DFG), micro-components are produced by deep drawing from thin metal foils with thicknesses from 20 μm to 50 μm. The production of such foils by conventional methods as multiple rolling processes of cast sheets is very time consuming since the initial defect free crystal lattice has to be recovered repeatedly by heat treatments after each rolling process to reach a final foil thickness below 50 μm. In the present work, physical vapor deposition (PVD) by DC magnetron sputtering was used as an alternative way to produce thin (≈ 15 μm) TWIP steel foils. An iron based alloy with 25 mass % manganese, 3 mass % silicon and 3 mass % aluminum was deposited onto 100 μm copper foils. After the deposition process the copper substrate foils were removed by selective etching without affecting the resulting TWIP steel films. Microstructure, phase contents and mechanical properties of the resulting PVD-X5MnAlSi25-3-3 TWIP-steel foils were characterized as a function of post annealing conditions. Additionally, the influence of the roughness of the copper substrate foils on the mechanical properties of the resulting PVD-TWIP steel foils was investigated.

Mechanical Properties, Microstructure and Phase Composition of Thin Magnetron Sputtered TWIP Steel Foils