Effect of surface treatments on the strength of carburized gears |
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| Authors: | Sung-Ki Lyu Katsumi Inoue Gang Deng Masana Kato |
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| Affiliation: | (1) Department of Mechanical Design and Production Engineering, Research Center for Aireraft Parts Technology, Gyeongsang National University, Japan;(2) Tohoku University, Japan;(3) Miyazaki University, Japan |
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| Abstract: | This paper deals with effects of surface treatment on the bending fatigue strength of SCM415 carburized spur gears. The test
gears are treated by the combination of shot peening, chemical polishing and electropolishing after carburization. The fatigue
tests demonstrate that the strength is sensitive to the surface condition of tooth fillet and the removal of the nonmartensitic
layer caused by decarburization is considerably effective in enhancing the strength. In the first part of this paper, the
influence of surface treatments such as shot peening, chemical polishing and electropolishing on the strength enbancement
for carburized gears are summarized and discussed. In the second part, the crack lengths are calculated from the fatigue test
results for the carburized and surface-treated gears, and the effect of surface treatments is discussed from the view point
of fracture mechanics. |
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| Keywords: | Carburized Gears Fatigue Strength Shot Peening Chemical Polishing Electropolishing Surface Treatment Surface Condition Crack Lengths Fracture Mechanics Strength Evaluation |
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