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A New Iron-Base Superalloy for Exhaust Valves
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English
Abstract
For heavy duty gasoline or diesel engines, exhaust valves of 21-2N or 21-4N are generally coated by cobalt-base hard facing alloys, at faces. But the sluggish supply and the spiraling price of cobalt recently forced automakers to adopt valves of high-grade superalloys without hard facing. Candidate superalloys for high-performance exhaust valves are gamma-prime strengthened nickel-base alloys such as Inconel 751 and Nimonic 80A. Unfortunately above-mentioned alloys are too expensive for automobile components. So authors tried to develop a gamma-prime strengthened iron-base alloy, which bears basically 40% Ni-19% Cr-Al-Ti. To optimize Al and Ti contents the effect of the total amount and the ratio of them was examined thoroughly on hardness, strength and corrosion resistance of experimental alloys at elevated temperatures. Finally authors succeeded in developing a new gamma-prime strengthened iron-base superalloy, RS914, which is inexpensive and satisfies requirements for exhaust valves of both gasoline and diesel engines.
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Authors
Citation
Kato, T., Uyehara, N., Matsunaga, K., Isomura, T. et al., "A New Iron-Base Superalloy for Exhaust Valves," SAE Technical Paper 810032, 1981, https://doi.org/10.4271/810032.Also In
References
- Kocis J. F. Matlock W. M. “Alloy Selection for Exhaust Valves.” Met. Prog. 1975 3 58
- Tezuka H. Sugiura S. Sugiyama T. “Refining of Nickel-Base Alloys in Plasma Induction Fournace.” Processing of the Fourth International Conference on Vacuum Metallurgy Tokyo 1973 142
- Nehrenberg A. E. Vitcha E. T. Matlock W. M. “New Valve Alloy Combats Corrosion, Wear.” Met. Prog. 1974 11 67
- Osawa M. Hagiwara Y. “Exhaust Train Materials for Current Japanese Auto-Manufacturers.” SAE Paper, No. 780244 1978
- Jones D. R. “Fatigue Behavior of Exhaust Valve Alloys.” SAE Paper, No. 800315 1980
- Jenkins L. F. Larson J. M. “The Development of a New Austenitic Stainless Steel Exhaust Valve Material.” SAE Paper, No. 780245 1978
- Dumont L. F. Newby W. E. Ind. Eng. Chem. 45 1953 1336
- Kusaka K. Ikushima K. Yamazaki M. “On the Lead Oxide Corrosion of Valve Steels.” Report of the 123rd Committee on Heat-Resisting Metals and Alloys 8 1967 3 573
- Street J. C. SAE Trans. 61 1953 442
- Ito T. Kobayashi T. Ōbayashi M. Komatsu N. “Hot-corrosion of Valve Steels by Lead Compounds.” J.I.S.I. of Japan 60 1979 4 S339