Automotive wheel discs made of casting aluminium alloy AlSi11 damaged under operation were examined. The expertise was aimed at explaining reasons of the failure and included microscopic examination and mechanical testing. The examination revealed significant inhomogeneity of the material structure characterized by presence of correctly modified eutectic areas (alpha+Si) and needle-shaped primary silicon crystals. The alpha solid solution areas created oblong non-isolated dendritic inclusions. Numerous porosities were observed on cross-section of the discs. The fatigue cracks were initiated in under-surface areas of eutectic mixture and primary nonmodified silicon crystals. Further crack propagation occurred through elongated boundaries of alpha dendrites and through porosity areas. The material with so unfavourable structure showed low mechanical strength.


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    Title :

    Wplyw mikrostruktury na pekanie zmeczeniowe tarcz kol samochodowych wykonanych ze stopu aluminium


    Additional title:

    Der Einfluss des Mikrogefüges auf das Ermüdungsrissverhalten von Autorädern aus Alumiuniumlegierungen
    The effect of microstructure on fatigue cracking of aluminium-alloy automotive rims


    Contributors:


    Publication date :

    2006


    Size :

    4 Seiten, 4 Bilder, 1 Tabelle, 9 Quellen



    Type of media :

    Conference paper


    Type of material :

    Print


    Language :

    Polish





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