This content is not included in
your SAE MOBILUS subscription, or you are not logged in.
Impact Properties of Selected Gear Steels
Annotation ability available
Sector:
Language:
English
Abstract
The unnotched Charpy impact properties of carburized 8620, 4620, 4620 + 0.3 Mo, and 3310 were studied at two case depths. The ranking of the alloys in order of increasing impact strength for both case depths was: 8620, 4620, 4620 + 0.3 Mo, 3310. Increasing the nickel content of carburized steel resulted in greater crack initiation resistance in the carburized case. Increasing the molybdenum content, while maintaining the nickel content constant, increased the crack propagation resistance of the core material. Additional tests showed the amount of austenite which transformed prior to fracture and the fracture strain increased with nickel content. The greater amount of austenite transformed during straining before fracture results in the improved crack resistance of carburized cases of the high nickel steels.
Recommended Content
Authors
Citation
Shea, M., "Impact Properties of Selected Gear Steels," SAE Technical Paper 780772, 1978, https://doi.org/10.4271/780772.Also In
References
- Jolley W. “Effect of Mn and Ni on the Impact Properties of Fe and Fe-C Alloys,” Journal of the Iron and Steel Institute 206 1968 170
- Stoloff N. S. “Fundamental Phenomena in Materials Science,” Plenum Press New York 1967 197
- DePaul R. A. “High Cycle and Impact Fatigue Behavior of Some Carburized Gear Steels,” Metals Engineering Quarterly 4 November 1970 25
- DePaul R. A. “Impact Fatigue Resistance of Commonly Used Gear Steels,” Paper 710277 SAE Automotive Engineering Congress Detroit January 1971
- Eagan I. R. Shelton C. H. “Recent Test Data on Selection of Alloy Steels for Gear and Bearings,” Paper 720301 SAE International Automotive Engineering Congress January 1973
- deBarbadillo J. J. “The Effect of Impact Prestressing on the High Cycle Fatigue Resistance of Carburized Gear Steels,” Paper 730142 SAE International Automotive Engineering Congress January 1973
- 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 of the American Society for Metals,” 62 1969 829
- Richman R. H. Landgraf R. W. “Some Effects of Retained Austenite on the Fatigue Resistance of Carburized Steel,” Metallurgical Transactions 6A 1975 955
- Hollomon J. H. Jaffe L. D. Buffum D. C. “Stabilization, Tempering and Relaxation in the Austenite-Martensite Reaction,” Journal of Applied Physics 18 1947 780
- Averbach B. L. Lorris S. G. Cohen M. “Stress-Induced Transformation of Retained Austenite in Hardened Steel,” Transactions of the American Society for Metals 44 1952 746
- Cohen M. “Retained Austenite,” Transactions of the American Society for Metals 41 1949 35