Abstract
This paper presents the findings from the failure analysis of an induction-hardened spur gear from a Vibro-Hammer, which failed after two months’ operation. The analysis of the gear showed that the failure occurred due to tooth-bending fatigue. The premature fatigue was attributed to incorrect case-hardening practice which was aggravated by poor machining, misalignment of the gear and incorrect heat-treatment prior to induction-hardening. It was recommended to improve the case-hardening, machining, installation and heat-treatment procedures in order to increase the service-life of the gear.
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