About this Abstract |
Meeting |
2023 TMS Annual Meeting & Exhibition
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Symposium
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Fatigue in Materials: Fundamentals, Multiscale Characterizations and Computational Modeling
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Presentation Title |
Investigation of the Impact of Residual Stresses on Short Crack Propagation in Martensitic Spring Steel |
Author(s) |
Anna Wildeis, Matthias Thimm, Hans-Jürgen Christ, Robert Brandt, Claus-Peter Fritzen |
On-Site Speaker (Planned) |
Anna Wildeis |
Abstract Scope |
Herein, the short crack propagation (SCP) in a martensitic steel via in-situ fatigue tests in a confocal laser microscope and additional electron back scattered diffraction analyses to link the local crystallographic orientation of the microstructure with the SCP behaviour are investigated. To determine the effect of residual stresses, samples are tested with and without prior shot peening treatments. The results obtained indicate an early formation of a short crack network, where initiation sites are mainly at or close to prior austenite grain boundaries (PAGBs). The SCP rates exhibit an oscillating behaviour due to a strong interaction of the fatigue cracks with PAGBs. The shot-peened samples show similar SCP mechanisms. However, the shot peening treatment leads to a higher fatigue resistance, which is probably due to a delayed transition from SCP to long crack propagation and a shift of the fatal crack initiation site from the sample surface to the interior. |
Proceedings Inclusion? |
Planned: |
Keywords |
Characterization, Iron and Steel, Other |