Dresden 2017 – scientific programme

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MM: Fachverband Metall- und Materialphysik

MM 70: Mechanical Properties II

MM 70.4: Talk

Thursday, March 23, 2017, 17:45–18:00, IFW D

Microstructure evolution in pearlite during microscale wear experiments — •Caroline Fink, Steffen Brinckmann, and Gerhard Dehm — Max-Planck-Institut für Eisenforschung GmbH, 40237 Düsseldorf, Germany

We study friction and wear of a microasperity on a smooth surface to enhance the understanding of macroscopic friction. This study focuses especially on the tribologically induced microstructure evolution in pearlitic steel. The bulk pearlite is mechanically ground and polished to achieve a flat surface. Single microscratches are performed by a conical diamond tip of a few micrometer radius in a nanoindenter. After target preparation, the microstructure underneath the scratch is studied with scanning electron microscopy. We observed matrix grain refinement, lamellae fracture and bending. We further investigate the latter with cementite fracture toughness and bending experiments by using microcantilevers inside an in-situ nanoindenter. Furthermore we evaluate tribological surface layer formation via electron backscatter diffraction.