Abstract
The turbine wheel is the most affected element in passenger car turbochargers. In order to meet the requirements for the high temperature corrosion, vibrations and the mechanical resistance in the oxidizing environment of the exhaust gases, the turbine wheel is produced from polycrystalline nickel based superalloys, Inconel 713C in the as-cast condition. In this work the methods and results of turbine wheel failure analysis are presented. For this type of research, correlative microscopy, light microscope Axio Imager Z2m (LM), scanning electron microscope Zeiss Ultra Plus with field emission (FESEM) equipped with EDX detector and stereoscopic microscope were used. The results of this work suggest that the Inconel 713C turbine wheel was damaged by two factors: fatigue cracking at low frequencies and grain boundaries oxidation.
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