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Effect of Thermal Treatments and Carbon Potential on Bending Fatigue Performance of SAE 4320 Gear Steel
Technical Paper
1999-01-0603
ISSN: 0148-7191, e-ISSN: 2688-3627
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English
Abstract
This project investigated the effect of carburizing carbon-potential and thermal history on the bending fatigue performance of carburized SAE 4320 gear steel. Modified-Brugger cantilever bending fatigue specimens were carburized at carbon potentials of 0.60, 0.85, 1.05, and 1.25 wt. pct. carbon, and were either quenched and tempered or quenched, tempered, reheated, quenched, and tempered. The reheat treatment was designed to lower the solute carbon content in the case through the formation of transition carbides and refine the prior austenite grain size.
Specimens were fatigue tested in a tension/tension cycle with a minimum to maximum stress ratio of 0.1. The bending fatigue results were correlated with case and core microstructures, hardness profiles, residual stress profiles, retained austenite profiles, and component distortion. The lower case carbon contents resulted in higher bending fatigue endurance limits, a result attributed to lower retained austenite and higher residual compressive stresses. The lower carbon potential specimens experienced more dimensional distortion compared to the higher carbon potential specimens. The bending fatigue endurance limits of the reheated specimens were approximately 10% higher than those of the quenched and tempered specimens.
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Citation
Medlin, D., Cornelissen, B., Matlock, D., Krauss, G. et al., "Effect of Thermal Treatments and Carbon Potential on Bending Fatigue Performance of SAE 4320 Gear Steel," SAE Technical Paper 1999-01-0603, 1999, https://doi.org/10.4271/1999-01-0603.Also In
References
- Hyde R.S. Matlock D.K. Krauss G. “Quench Embrittlement: Intergranular Fracture Due to Cementite and Phosphorus in Quenched Carbon and Low Alloy Steels” Proc. 40 th Mechanical Working and Steel Processing Conference October 1998 ISS-AIME Warrendale, PA 921 928
- Hyde R.S. Krauss G. Matlock D.K. “Phosphorus and Carbon Segregation Effects on Fatigue and Fracture of Gas-Carburized Modified 4320 Steel” Met. Trans. A 25A June 1994 1229 1240
- Van de Sanden J. Practical Metallography 17 1980 238
- Parrish G. “The Influence of Microstructure on the Properties of Case Carburized Steel” ASM International 1980
- Sieber R. “Bending Fatigue Performance of Carburized Gear Steels” SAE International, SAE Technical Paper # 920533 February 1992
- Magnusson L. Ericsson T. “Initiation and Propagation of Fatigue Cracks in Carburized Steel “Heat Treatment 1979 The Metals Society May 1979 202
- Hyde R. Krauss G. Matlock D.K. “The Effect of Reheat Treatments on Fatigue and Fracture of Carburized Steels SAE International, Technical Paper No. 940788 1994
- Raghavan V. “Phase Diagrams of Ternary Iron Alloys: Part 3, Ternary Systems Containing Iron and Phosphorus” 1st Indian Institute of Metals Calcutta, India 1988 33 44
- Cohen R.E. Haagensen P.J. Matlock D.K. Krauss G. “Assessment of Bending Fatigue Limits for Carburized Steel” SAE International, Technical Paper No. 910140 1991
- Hyde R.S. Cohen R.E. Matlock D.K. Krauss G. “Bending Fatigue Crack Characterization and Fracture Toughness of Gas Carburized SAE 4320 Steel” SAE Technical Paper No. 920534 1992
- 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
- Cohen R.E. Krauss G. Matlock D.K. “Bending Fatigue Performance of Carburized 4320 Steel” SAE International, Technical Paper No. 930963 1993
- Medlin D.J. Krauss G. Matlock D.K. Burris K. Slane M. “Comparison of Singe Tooth and Cantilever Beam Bending Fatigue Testing of Carburized Steel” SAE international, Technical Paper No. 950212 1995
- Krauss G. “Steels: Heat Treatment and Processing Principles” ASM International 1990 263