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http://dx.doi.org/10.12656/jksht.2014.27.4.191

Failure Analysis of Carburized Gears by Microstructural Observation  

Chun, Hae Dong (Research Institute of Master Company)
Chang, Sung Ho (Kumoh National Institute of Technology Graduate School)
Kim, Kyung Wook (Kumoh National Institute of Technology Graduate School)
Kuk, Youn Ho (Kumoh National Institute of Technology Graduate School)
Publication Information
Journal of the Korean Society for Heat Treatment / v.27, no.4, 2014 , pp. 191-201 More about this Journal
Abstract
The gear was made of SNC815 case-carburized, quench hardened and tempered steel. The gears were failed far earlier than the expected service life used in the industrial site. Causes of the failed gear were analyzed by microstructure observation. By the SEM and micro structure examinations, the damaged surfaces had been weared and failed by fatigue. Through microscope observation on the damaged surface, it was found that the cause of failure was determined by external overloading and the initial stage of the damage was closely related to complex contact fatigue failure. The overload and contact fatigue contributed to the early failure cause.
Keywords
Case-carburized; Failed gear; Contact fatigue failure; Micro pit; Frictional heat of the surface; Model of crack generation;
Citations & Related Records
Times Cited By KSCI : 2  (Citation Analysis)
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