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The Effect of Impact Fatigue Prestressing on the High Cycle Fatigue Resistance of Carburized Gear Steels
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Abstract
Gears are frequently exposed to conditions involving random or repeated high strain rate loading in addition to high cycle bending fatigue stresses. Although gears usually fail ultimately by high cycle fatigue, random impact loads superimposed on the predictable bending fatigue stress may lead to premature fatigue failure. The present study examined the effect of repeated prior impact loading on the high cycle fatigue properties of carburized 4118, 4820 and EX-1 steels. It was found that impact prestressing does affect the endurance limit and that this effect can either be detrimental or beneficial. Case microstructure, particularly retained austenite content, and nickel content both affected sensitivity to impact prestressing. The greatest resistance to impact fatigue damage was found in EX-1 steel which had been heat treated to contain approximately 20% austenite. The results of this study have been interpreted in terms of the Troiano theory of ductility in high carbon alloy steels.
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Authors
Citation
deBarbadillo, J., "The Effect of Impact Fatigue Prestressing on the High Cycle Fatigue Resistance of Carburized Gear Steels," SAE Technical Paper 730142, 1973, https://doi.org/10.4271/730142.Also In
References
- Kern, R. F. “Selecting Steels for Carburized Gears,” Metal Progress July 1972 53 64
- Brugger, H. Kraus, G. “Influence of Ductility on the Behavior of Carburizing Steel During Static and Dynamic Bend Testing,” 32 1961 529 539
- Brugger, H. Kraus, G. “Influence of Ductility on Fatigue Strength and Endurance Limit of Case Hardened Components,” 32 1961 627 635
- Moulin, L. Tricot, R. Castro, R. Revue de Metallurgie 66 1969 263 270
- DePaul, R.A. “Impact Fatigue Resistance of Carburized Gear Steels - Development of a Testing Machine and Evaluation of Initial Test Results,” Materials Research and Standards 10 3 1969
- DePaul, R.A. “High Cycle and Impact Fatigue Behavior of Some Carburized Gear Steels,” Metals Engineering Quarterly Nov. 1970
- DePaul, R.A. “Impact Fatigue Resistance of Commonly Used Gear Steels,” Automotive Engineering Congress Detroit, Michigan Jan. 11-15 1971
- Eagan, J.R. Shelton, C.H. “Recent Test Data on Selection of Alloy Steels for Gears and Bearings,” Automotive Engineering Congress Detroit, Michigan Jan. 10-14 1972
- Krotine, F.T. McGuire, M.F. Ebert, L.J. Troiano, A.R. “The Influence of Case Properties and Retained Austenite on the Behavior of Carburized Components,” Transactions Quarterly of the American Society of Metals 62 4 Dec. 1969 829 838
- Razim, C. “Influence of Residual Austenite on the Strength of Case-Hardened Specimens Under Conditions of Fluctuating Stress,” Harterei-Tech.-Mitt. 23 1968 1 8
- McGuire, M.F. Troiano, A.R. Ebert, L.J. “Phase Transformation Effects on the Bending Stress Distribution in Carburized Steel Components,” Journal of Basic Engineering, ASME Paper No. 71-Met-H Dec. 16 1970
- DePaul, R.A.