Dresden 2011 – scientific programme

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MM: Fachverband Metall- und Materialphysik

MM 43: Mechanical Properties II

MM 43.4: Talk

Thursday, March 17, 2011, 18:45–19:00, IFW D

Micro- and Nanostructure Characterization Imaging of TWIP Steels — •Leonardo Batista, Ute Rabe, and Sigrun Hirsekorn — Fraunhofer IZFP, Campus E3 1, 66123 Saarbrücken, Germany

New design concepts for the construction of advanced light-weight and crash resistant transportation systems require the development of high strength and supra-ductile steels combined with enhanced energy absorption and reduced specific weight. TWIP (Twinning Induced Plasticity) steels have excellent mechanical properties combining high strength levels (Rm > 1000 MPa) with a large uniform elongation (Au > 50%). These properties are a direct consequence of intensive mechanical twinning resulting in a high sustained degree of strain-hardening. The mechanisms and the interaction of the mechanical twinning with the microstructure which leads to such outstanding mechanical properties are, however, not well understood. In order to characterize the microstructure and probe the local material properties combined studies using EBSD (Electron Backscattering Diffraction) and AFAM (Atomic Force Acoustic Microscopy) as well as TEM (Transmission Electron Microscopy) have been used.