Berlin 2015 – wissenschaftliches Programm

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MM: Fachverband Metall- und Materialphysik

MM 51: Mechanical properties II

MM 51.3: Vortrag

Donnerstag, 19. März 2015, 10:45–11:00, TC 010

Nanotribology induced Microstructure Evolution in Pearlite — •Caroline Fink, Steffen Brinckmann, Sunmi Shin, and Gerhard Dehm — Max-Planck-Institut für Eisenforschung GmbH, Düsseldorf, Germany

Tribology has long been understood as a hierachical phenomenon: nanoscale asperities exist on mesoscale asperities which exist on macroscopic asperities. Hence, tribology is a multiscale mechanism that spans multiple orders of length scales. We focus on tribological experiments at the micro- and nanoscale in iron alloy micro-structures to fundamentally understand tribology. The aim of this study is to upscale these findings to the friction and wear behavior at the macroscale. We prepare pearlite samples with varying carbon content and highlight the preparation requirements for experiments at the nanoscale. Single stroke scratches are performed and used to provide microstructure specific friction coefficients and scratch depths. Post-deformation investigations by atomic force microscopy, scanning electron microscopy and confocal microscopy reveal the microstructure dependent pile-up and real contact area. Cross-sections by focused ion beam milling show the nanotribology induced sub-surface microstructure which we relate to the cemetite lamellae orientation and spacing. Finally, we will highlight the influence of the nanoscale counter-body shape on the wear resistance and the friction coefficient.