Berlin 2018 – scientific programme
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MM: Fachverband Metall- und Materialphysik
MM 55: Topical session (Symposium EPS and MM): Mechanical Properties at Small Scales
MM 55.3: Talk
Thursday, March 15, 2018, 12:30–12:45, H 0106
Severe Microscale Deformation of Pearlitic Steel During Tribology — •Steffen Brinckmann1, Caroline Fink1, Haleh Taghinejadi2, and Gerhard Dehm1 — 1Max-Planck-Insitut für Eisenforschung, Düsseldorf, Germany — 2University of Cambridge, Cambridge, UK
Tribology at the macroscale is determined by the interaction of the microasperities that result in the wear of the counter surface and the subsurface microstructure evolution. State of the art macroscale tribology experiments investigate the convoluted interaction of a thousands of asperities and phases. We focus on a single asperity with micrometer size and study how the pearlite microstructure is deformed. The pearlite consists of hard cementite lamellae and soft ferrite matrix, each of which has a unique deformation mechanisms. We study both deformation mechanisms and discuss how the alignment of the microstructure influences the residual deformation, the wear of the microstructure. We determine the cementite deformation mechanisms and quantify the grain refinement in the ferrite matrix as a function of the wear loading. The development of a microstructure based understanding of the wear mechanisms would allow in the future to design wear resistant surfaces for engineering components.