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Fatigue damaging micromechanisms in a ferritic ductile cast iron were investigated by using a scanning electron microscope (SEM) with a microtensile holder. Fatigue tests were performed under load control conditions and damage analysis were performed according to a step by step experimental procedure: specimens surfaces were observed by means of a SEM during the test (“in situ” tests). Experimental results show the complex role played by the graphite nodules.
KEYWORDS. Fatigue; Ferritic ductile iron; Damaging micromechanism.