JSME International Journal Series A Solid Mechanics and Material Engineering
Online ISSN : 1347-5363
Print ISSN : 1344-7912
ISSN-L : 1344-7912
Fatigue & Fracture
Increase in Fatigue Limit of Gears by Compound Surface Refining Using Vacuum Carburizing, Contour Induction Hardening and Double Shot Peening
Katsuyuki MATSUIHirohito ETOKatsuya YUKITAKEYoshitaka MISAKAKotoji ANDO
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2002 Volume 45 Issue 2 Pages 290-297

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Abstract

To increase the fatigue limit of the Carburized gears, the following five techniques need to be developed: 1) Reduce abnormal surface structure. 2) Obtain a fine grain size. 3) Decrease the retained Austenite structure. 4) Increase hardness under the surface. 5) Improve the residual stress distribution under the surface. For this purpose, the authors conducted a study by using DSG1 steel gears on the new compound surface refining method consisting of Vacuum Carburizing, Contour Induction Hardening and Double Shot Peening. The result of the study showed that the fatigue limit of the gears processed by the new compound surface refining method achieved 150% better than that of the single processed Vacuum Carburized gears. Furthermore, the authors analyzed the correlation between the fatigue limit and the yield stress, the maximum compressive residual stress & the mean grain size of gears systematically, the consequence of which was the fatigue limit given with an equation.

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© 2002 by The Japan Society of Mechanical Engineers
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