High cycle fatigue behavior of high-Mn TWIP steel with different surface morphologies

Abstract Cyclic deformation behavior and fatigue life of high-Mn TWIP steel with different surface morphologies was investigated. Specimens with different surface morphologies, namely polished, down and up milled, were loaded in the HCF regime. The surface morphologies were analyzed by cyclic indentation tests, XRD, SEM and FIB methods. Milling led to differences in topographies, residual stresses and microstructures. Fatigue tests at various stress amplitudes were conducted in the HCF regime, investigating how these surface morphologies affect the cyclic deformation behavior and consequently fatigue life. The results show a significant influence of the surface morphologies on the material’s behavior under cyclic loading.