Cyclic deformation highly loaded railway materialsInterrelation of the microstructure and the fatigue behaviour of railway wheels at ambient and elevated temperatures
Frank Walther und Dietmar Eifler, Kaiserslautern
ABSTRACT This paper aims at a better understanding of the cyclic deformation behaviour of highly loaded railway materials under special consideration of the microstructural gradients in the wheels / tires due to the industrial heat treatments and elevated temperatures developing in the wheel / rail contact area during service loading. The experiments were performed with servohydraulic testing systems. In addition to mechanical hysteresis measurements, the change of the specimen temperature and the electrical potential (voltage) due to plastic deformation processes were recorded at ambient temperature tests. Beside characteristic cyclic softening and hardening processes, in constant amplitude tests dynamic strain ageing effects were observed in a defined temperature range. The microstructural characterisation of the different material conditions was done by light (LM), scanning (SEM) and transmission (TEM) electron microscopy together with digital image processing.
Publication Source: Materialprüfung, ISSN: 0025-5300
Issue: 2004-4, pp -
Publisher: Carl Hanser Verlag München
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