WEB Deformation behaviour of Austenitc stainless steel during tribological loadingTuesday (22.09.2020) 14:45 - 15:00 S: Structural Materials 2 Part of:
During operation, wear of materials causes energy loss and increasing replacement costs, which lead to higher economic costs. Metal wear properties significantly depend on the microstructure near the surface region. Past studies  have shown that the tribological loading on ductile metals leads to change from coarse to fine grained microstructure in the subsurface region. Due to complex nature of tribological interactions, a quantitative description of this process is still at large. It is generally observed that the fine grained microstructure reduces the wear rate as it has higher hardness. Austenitc stainless steel is ubiquitously used in a wide temperature range for its good mechanical properties and thermal stability.
Austenitic steel predominantly deforms by twinning. To investigate this deformation phenomena during tribological loading, we employ sliding experiments on different grain orientations with varying loads and directions using a diamond microasperity. The grain orientation and scratch direction are determined by Electron Backscatter Diffraction (EBSD). Large grains with certain orientations are selected and subjected to sliding experiments with varying load. After deformation, EBSD is performed on the wear track to investigate and quantify the microstructure evolution after tribological loading. To observe subsurface plasticity, cross-sections from wear track are produced using a Focused Ion Beam (FIB) and are characterized by Transmission Kikuchi Diffraction (TKD) in SEM and TEM. Preliminary results show that the deformation mechanism is dependent on the grain and wear orientation.