Influence of Surface Morphology on Fatigue and Tribological Behavior of TRIP/TWIP Steels

Opposite to widely used austenitic stainless steels (see Chapter “Influence of Manufacturing and Load Conditions on the Phase Transformation and Fatigue of Austenitic Stainless Steels”), high manganese Transformation Induced Plasticity (TRIP)/TWinning Induced Plasticity (TWIP) steels are not corrosion resistant. However, these steels undergo intensive research work, because of their unique combination of high strength and high ductility. First fully austenitic TWIP steels are already industrially available. Parallel to research presented elsewhere on TRIP/TWIP steels as a bulk material, the surface morphology on the micro scale was investigated in this work. The possibility to manufacture different surface morphologies as well as the change in the topography, microstructure, and mechanical properties of near-surface regions up to 10  \(\upmu \) m depth after conventional milling, micro milling as well as lapping was investigated in detail. Based on that, the influence of different surface morphologies on the cyclic deformation behavior and fatigue life in LCF, HCF, and VHCF regime as well as tribological properties of austenitic TRIP/TWIP steels are analyzed.