Author(s)

J. Man, J. Polák, M. Vičar, K. Obrtlík, J. Matějková & A. Rek

Abstract

AFM study of slip localization and surface relief evolution in fatigued ferritic XlOCrA124 stainless steel J. an', J. polikl, M. vicar2, K. Obrtlikl, J. ~ a t ~ j k o v a ~ & A. ~ e k ~ 1 Institute of Physics of Materials, Brno, Czech Republic 2 Czech Metrology Institute, Brno, Czech Republic 3 Institute of Scientific Instruments, Brno, Czech Republic Abstract Atomic force microscopy (AFM) was applied to study the surface relief evolution at the emerging persistent slip bands (PSBs) in individual grains of polycrystalline ferritic stainless steel cycled with constant plastic strain amplitude. The surface relief starts to develop early in the fatigue life (at 0.2- 0.5% Nf) due to the localization of the cyclic plastic strain into PSBs. The appearance of the first persistent slip markings (PSMs) correlates with the cyclic hardeninglsoftening curve and with the characteristic variations in the loop shape parameter VH. Surface relief of the well-developed individual PSMs consists of extrusions wit

Keywords