|About this Abstract
||2017 TMS Annual Meeting & Exhibition
||Fatigue in Materials: Fundamentals, Multiscale Modeling and Prevention
||Fatigue Assessment of a Railway Wheel Steel in the VHCF-regime
||Dietmar Eifler, Michael Koster
|On-Site Speaker (Planned)
The fatigue behavior of the railway wheel steel SAE 1050 in the Very High Cycle Fatigue regime was investigated with the in-house-developed ultrasonic test system “UltraFAST-WKK-Kaiserslautern” (UFK). Based on preliminary load increase tests, constant amplitude tests were performed. The UFK allows to measure process parameters like generator power, dissipated energy and specimen temperature as well as the oscillation amplitude at the free end of the specimens with a Laser Doppler Vibrometer. Additionally the system’s resonance frequency and the attenuation behavior of the specimens allow to determine fatigue induced changes in the materials microstructure with a very high sensitivity. The measured data were correlated with scanning and transmission electron microscopic observations. Fatigue tests were interrupted if fatigue induced microstructural changes were indicated by a significant increase of temperature or electrical resistance. With this method an increasing dislocation density as well as persistent slip bands could be verified before final failure occurs.
||Planned: Stand-alone book in which only your symposium’s papers would appear (indicate title in comments section below)