Influence of Surface Morphology on the Fatigue Behavior of Metastable Austenitic Steel

Abstract:

Using a low temperature turning process with carbon dioxide cooling in the cutting zone a variation of the morphology at the specimen surfaces of the metastable austenitic steel AISI 347 was realized. In LCF and HCF fatigue tests at ambient temperature and 300 °C the influence of the surface morphology on the cyclic deformation behavior and fatigue life was investigated by the measurement of stress-strain hysteresis. An additional magnetic measurement allows the characterization of the phase transformation from paramagnetic austenite in ferromagnetic α´-martensite during the turning processes and during cyclic loading. The surface morphology was studied in detail by SEM and x-ray investigations.

• Periodical: Advanced Materials Research (Volumes 891-892)
• Pages: 464-469
• DOI: https://doi.org/10.4028/www.scientific.net/AMR.891-892.464
• Online since: March 2014
• Authors: Robert Skorupski, Marek Smaga*, Dietmar Eifler
• Keywords: bcc-hcp-Martensite, HCF, LCF, SEM, Surface Morphology, X-Ray

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