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Optimized Carburized Steel Fatigue Performance as Assessed with Gear and Modified Brugger Fatigue Tests
Technical Paper
2002-01-1003
ISSN: 0148-7191, e-ISSN: 2688-3627
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English
Abstract
The effectiveness of three different techniques, designed to improve the bending fatigue life in comparison to conventionally processed gas-carburized 8620 steel, were evaluated with modified Brugger bending fatigue specimens and actual ring and pinion gears. The bending fatigue samples were machined from forged gear blanks from the same lot of material used for the pinion gear tests, and all processing of laboratory samples and gears was done together. Fatigue data were obtained on standard as-carburized parts and after three special processing histories: shot-peening to increase surface residual stresses; double heat treating to refined austenite grain size; and vacuum carburizing to minimize intergranular oxidation. Standard room-temperature S-N curves and endurance limits were obtained with the laboratory samples. The pinions were run as part of a complete gear set on a laboratory dynamometer and data were obtained at two imposed torque levels. The number of cycles to failure was used to evaluate the effects of processing history.
Based on laboratory endurance limits, shown in parentheses, the processing histories ranked as follows: shot-peened (1410 MPa), vacuum carburized (1210 MPa), reheated to refine grain size (1140 MPa), and as-gas-carburized (1000MPa). In the gear set tests, shot peening also proved to be the most effective way to improve fatigue life at both imposed torque levels. The results of this study show that data on laboratory samples can be used to interpret the fatigue performance of gears.
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Spice, J., Matlock, D., and Fett, G., "Optimized Carburized Steel Fatigue Performance as Assessed with Gear and Modified Brugger Fatigue Tests," SAE Technical Paper 2002-01-1003, 2002, https://doi.org/10.4271/2002-01-1003.Also In
References
- Cohen R.E. Matlock D.K. Krauss G. “Specimen Edge Effects on Bending Fatigue of Carburized Steel” Journal of Materials Engineering and Performance 1 5 1992 695 703
- Wise J.P. Matlock D.K. “Bending Fatigue of Carburized Steels: A Statistical Analysis of Process and Microstructural Parameters” SAE Technical Publication No. 2000-01-0611 SAE Warrendale, PA. 2000
- Wise J.P. Matlock D.K. Krauss G. “Microstructure and Fatigue Resistance of Carburized Steels” Heat Treating: Proceedings of the 20 th Conference Funatani K. Totten G.E. ASM International, Materials Park Ohio 2001 2 1152 1161 “Bending Fatigue of Carburized Steels” Heat Treating Progress 1 4 2001 33 41
- Medlin D. Krauss G. Matlock D.K. Burris K. Slane M. “Comparison of Single Tooth and Cantilever Beam Bending Fatigue Testing of Carburized Steel” SAE Technical Paper Series, No. 950212 SAE Warrendale, PA. 1995
- Hyde R.S. Cohen R.E. Matlock D.K. Krauss G. “Bending Fatigue Crack Characterization and Fracture Toughness of Gas Carburized SAE 4340 Steel” SAE Paper No. 920534 SAE Warrendale, Pa. 1992
- Wilks T.P. Cavallaro G.P. Strafford K.N. “Fatigue of Surface-Hardened Gears” Technomic Publishing Co., Inc., Surface Engineering Process and Applications (USA) 1995 331 346 1995
- Cavallaro G.P. Subramanian C. “Fatigue of Case Hardened Gears” Gear Technology (USA) 16 2 18 23 Mar.-Apr. 1999
- Cavallaro G.P. Wilks T.P. Subramanian C. Strafford K.N. French P. Allison J.E. “Bending Fatigue and Contact Fatigue Characteristic of Carburizing Gears” Surface Engineering Research Group, University of South Australia, Surface Engineering Australia 1994
- Widmark M. Melander A. “Effect of Material, Heat Treatment, Grinding and Shot Peening on Contact Fatigue Life of Carburized Steels” International Journal of Fatigue (UK) 21 4 309 327 Apr. 1999
- Dowling W.E. Jr. Donlon W.T. Coppel W.B. Chernenkoff R.A. Darragh C.V. “Bending Fatigue Behavior of Carburized Gear Steels: Four-Point Bend Test Development and Evaluation” SAE Technical Paper No. 960977 SAE Warrendale, Pa. 1996