In this work, a 400 W Nd-YAG laser has been used to expose eight ferritic-pearlitic railroad steels to two different kinds of oscillating temperature cycles. Severe heating and water quenching cycles were chosen to test the materials thermal shock resistance. Their thermal fatigue behaviour has been tested in a laser pulse induced way. The results obtained from laser-tests show that improving the thermal shock resistance of any railroad steel requires opposite materials properties to those for improving its thermal fatigue resistance. Dependent on the severity of the temperature gradients, contrary connections between microstructure, material properties and thermal shock or fatigue resistance were obtained. This results were explained on the basis of the micromechanisms. It has further been shown that a high crack density on the surface of a material does not represent the crack propagation into the depth. Therefore, the evaluation of the material damage has to be carried out carefully. In conclusion, the laser test system serves a couple of possibilities to simulate the material behaviour under changing working temperatures. Nevertheless, the selection of a material with optimum thermal stress resistance can be a complex task.


    Access

    Access via TIB

    Check availability in my library

    Order at Subito €


    Export, share and cite



    Title :

    Nd-YAG-laser simulated thermal shock and thermal fatigue behaviour of railroad steel


    Additional title:

    Vd-YAG-Laser-Simulation des Thermoschock- und des thermischen Ermüdungsverhaltens von Radreifenstählen


    Contributors:
    Schaus, M. (author) / Pohl, M. (author)


    Publication date :

    1998


    Size :

    7 Seiten, 15 Bilder, 3 Tabellen, 16 Quellen



    Type of media :

    Article (Journal)


    Type of material :

    Print


    Language :

    English




    Laser thermal shock and fatigue testing system [3097-60]

    Fantini, V. / Serri, L. / Bianchi, P. et al. | British Library Conference Proceedings | 1997


    Thermal Fatigue Testing of Simulated Turbine Blades

    Spera, D. A. / Calfo, F. D. / Bizon, P. T. | SAE Technical Papers | 1971


    SHOCK ABSORBER FOR RAILROAD VEHICLE

    TANIMOTO MOTOHIRO / KIKKO SATOSHI | European Patent Office | 2017

    Free access

    Shock absorbers for railroad vehicles

    Bjorklund, B. / Schmiterlow, F. | Engineering Index Backfile | 1964


    Shock absorbers -- Railroad freight cars

    Meeker, R.F. | Engineering Index Backfile | 1968