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WEB Subsurface microstructural evolution in iron after scratch testing

Tuesday (22.09.2020)
14:30 - 14:45 S: Structural Materials 2
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Subsurface microstructural evolution due to tribological contact loading is of interest for the understanding of friction and wear phenomena. Due to the manifold factors that influence friction and wear of tribological contacts, one approach is to start with an unlubricated model system that consists of an electropolished disk and a mechanically and chemically inert pin. Previous research has shown the evolution of a dislocation trace line in a few hundred nanometers depth below the worn surface in OFHC Cu, Ni, Cu-Zn and Cu-Mn. Those materials are all fcc and it is of basic interest, if the findings can be transferred to a bcc material. In the present study, we did scratch tests with a ruby ball on electropolished iron to investigate the subsurface microstructural evolution in different wear track depth. Analysis of the subsurface microstructure with T-SEM showed a dislocation trace line only after the onset of ploughing, but it is excluded that the dislocation trace line occurs due to a folding mechanism. The results reveal similar features of the subsurface microstructure after one pass in iron and copper and give new insights in the microstructure evolution during tribological loading.

Speaker:
Dr. Dominic Linsler
Fraunhofer Institute for Mechanics of Materials IWM
Additional Authors:
  • Friederike Ruebeling
    KIT
  • Dr. Christian Greiner
    KIT