Micro-Crack Analyses of Chromium Steel JIS-SCr 420 for Helical Gear Transmission

This research aims to investigate micro-crack on a failed for helical gear transmission which was to adjust the engine to increased horsepower. The helical gears made are from chromium steel JIS-SCr 420. The spectrophotometer test machine was used to detect chemical composition, Mechanical propertie...

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Bibliographic Details
Published in:Key engineering materials 2018-08, Vol.777, p.294-299
Main Authors: Pluphrach, Ganwarich, Boonmag, Visanu, Wisesook, Ongarj, Phukaoluan, Aphinan
Format: Article
Language:English
Subjects:
Casting
Chromium steel
Chromium steels
Helical gears
Microcracks
Citations: Items that this one cites
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Summary:This research aims to investigate micro-crack on a failed for helical gear transmission which was to adjust the engine to increased horsepower. The helical gears made are from chromium steel JIS-SCr 420. The spectrophotometer test machine was used to detect chemical composition, Mechanical properties were evaluated by Vickers hardness and microstructural analysis with an optical microscope, which the crack of the surface layer and energy dispersive spectroscopy using a scanning electron microscope. The results showed that the fracture characteristic of the helical gear’s surface was expected to beach marks and break away. It can be seen that the mixing failure area of oxide inclusion with carbide surrounding before the liquid state of material will be solidified which caused the failure cause of this helical gear. The summary analysis results can be accorded with the assumption of this research and which help prolong service life of the component.
ISSN:1013-9826
1662-9795
1662-9795
DOI:10.4028/www.scientific.net/KEM.777.294