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TRR188_B03­-Damage initiation of DP800 at the micro scale

The TRR 188 is aiming for a thorough understanding and quantitative control of damage in advanced materials. As a subpart of TRR188, this project aims at microscopically studying the initiation of damage on dual phase steel DP800.

DP800 consists typically of ferrite as the matrix and dispersed martensite islands. This material exhibits not only excellent mechanical properties like high strength at high strains to failure, but also is economically superior due to few required alloying elements.

The size dependent Critical Resolved Shear Stress (CRSS), corresponding active slip systems and fracture toughness of all individual phases, i.e. ferrite, martensite and non-metallic inclusions will be obtained within this project. Furthermore, mechanism based models for the deformation of phase boundaries will be established.

The project thereby is not only closely linked to the method development in the micromechanics group, but also has numerous partners for synthesis, characterization and modelling within the TRR 188.

Fig. (a) Microstructure of tested DP800 etched by Nital, white islands martensite and grey matrix ferrite; (b) a pillar from single ferrite by FIB milling

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