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Austempered Materials and their Applications to Drive Line and Suspension Components
Technical Paper
2000-01-2563
ISSN: 0148-7191, e-ISSN: 2688-3627
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English
Abstract
The Austempering process is a high performance heat treatment that, when applied to ferrous materials, produces components that, in many cases, have properties superior to those processed by conventional means. The Austempering processes include:
- Austempered Ductile Iron
- Austempered Gray Iron
- Austempered Steels and Powdered Metals
- Carbo-Austempered™ Steels
Austempered Ductile Iron (ADI) has an exceptionally high strength-to-weight ratio with good fatigue strength and fracture toughness. In fact, with strength three times greater than that of aluminum with only two and a half times the density, ADI can replace aluminum at equal weight for a substantial cost savings.
Austempered Gray Iron (AGI) has an excellent combination of noise damping, wear resistance and thermal conductivity. It has received a great deal of attention as diesel engine manufacturers increase cylinder pressures to meet ever more stringent exhaust requirements.
Austempered Steels exhibit remarkable fatigue strength and toughness at hardnesses exceeding 38 Rc. They also resist hydrogen embrittlement during plating. High density, powdered metal parts do not crack during heat treatment.
Carbo-Austempered™ Steels exhibit low cycle, high load fatigue performance that is 40 to 70% better than that of comparably carburized and hardened components. Carbo-Austempered™ Steels can demonstrate an order of magnitude greater impact strength than carburized and hardened steels.
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Topic
Citation
Keough, J., "Austempered Materials and their Applications to Drive Line and Suspension Components," SAE Technical Paper 2000-01-2563, 2000, https://doi.org/10.4271/2000-01-2563.Also In
References
- “Ductile Iron Data for Design Engineers” Chapter 4, Austempered Ductile Iron Rio Tinto Ltd. 1998
- ASM Handbook 4 Heat Treating, “Austempering of Steel” 1995 Keough J. R. Laird, W. J. Jr. Godding A. D.
- Foreman, R. W. “New Developments in Salt Bath Quenching” Industrial Heating Magazine March 1993
- Kovacs, B. V. Keough, J. R. “Physical Properties and Application of Austempered Gray Iron” American Foundrymens Society (AFS) Transactions 1993
- Keough, W. R. “Carbo-Austempering” Carburizing and Nitriding with Atmospheres ASM Intl. 1995
- Flinn, R. A. Massachusettes Institute of Technology 1941
- Flinn, R. A. Cohen, M Chipman, J. “The Acicular Structure in Nickel Molybdenum Cast Irons” ASM Transactions 30 1255 1284 1942
- Gundlach, R. B. Janowak, J. “Process Overview / Wear and Abrasion Testing” 2 nd Intl. Conference on Austempered Ductile Iron ASME Gear Research Inst. Ann Arbor, MI 1996
- Applied Process Inc.
- www.ductile.org
- www.appliedprocess.com
- www.afsinc.org