The friction and wear behavior of the wheel-rail system is a complex phenomenon involving high mechanical load cyclings and microscopic fatigue mechanics. One of the most unfavorable processes occurring on running rail treads is surface corrugation, in particular for high speed trains (ICE). Rail surface corrugation can result in undesirable transportation behavior such as excessive vibrations in the rail/wheel-system. The understanding of rail surface corrugation mechanisms is important for the successful development of new high speed rail transportation systems. The surface of steel railroad tracks experience wear-induced hardening within a surface layer more than 100 micrometers thickness. The grain size is reduced to 15-20 nm, resulting in an increase of Vickers hardness by a factor of four, as determined by nanoindentation measurements. For comparison, the microstructure of mechanically alloyed powder samples is found to be similar to those of the wear-induced surface layer. As such, the ball milled powder samples can be used as a model system for characterizing the chemical, mechanical (hardness, Young's modulus, coefficient of friction) and thermal properties of the wear induced nanophase surfaces.


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    Title :

    Comparison between nanophase formation during friction induced surface wear and mechanical attrition of a pearlitic steel


    Additional title:

    Vergleich zwischen der Nanophasenbildung wärend der Reibung durch Oberflächenverschleiß und mechanischem Abrieb von einem perlitischem Stahl


    Contributors:
    Baumann, G. (author) / Zhong, Y. (author) / Fecht, H.J. (author)

    Published in:

    Nanostructured Materials ; 7 , 1/2 ; 237-244


    Publication date :

    1996


    Size :

    8 Seiten, 6 Bilder, 1 Tabelle, 7 Quellen




    Type of media :

    Article (Journal)


    Type of material :

    Print


    Language :

    English