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Application of a Newly Developed Iron-Base Superalloy to Exhaust Valves of Diesel Engines
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English
Abstract
The exhaust valves of 21-4N or 21-2N generally have hardfaced heads for heavy-duty engines. Hardfacing alloys contain a large amount of cobalt (Co), which sometimes becomes very scarce and outrageously expensive. Therefore, some automakers have adopted nickel (Ni)-base superalloys as unfaced exhaust valves, but continued to search for less expensive heat resisting alloy.
THE authors had succeeded in developing an iron (Fe)-base superalloy, RS 914, containing 40% Ni, 19% Cr, 2.8% Ti and 0.7% Al. The mechanical and chemical properties of this alloy had proved to be comparable with those of Ni-base Inconel 751. And unfaced exhaust valves of RS 914 passed endurance tests in turbo-charged diesel engines with minimal damage. This alloy is relatively low cost and easy to fabricate, so that it can be applied for unfaced exhaust valves substituting for Ni-base superalloys.
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Kato, T., Fujikura, M., likubo, T., isomura, T. et al., "Application of a Newly Developed Iron-Base Superalloy to Exhaust Valves of Diesel Engines," SAE Technical Paper 830253, 1983, https://doi.org/10.4271/830253.Also In
References
- Kocis J. F. Matlock W.M. “Alloy Selection for Exhaust Valves” Met. Prong 1975 58
- Nehrenberg, A. E. Vitcha E. T. Matlock W. M. New Valve Alloy Combats Corrosion, Wear” Met. Prong 1974 67
- Jenkins L. F. Larson J. M. “The Development of New Austenitic Stainless Steel Exhaust Valve Material” SAE Paper, No. 780245 1978
- Kato Tetsuo Uyehara Norioki Matsunaga Kenkichi Isomura Teruo Matsuno Masaki lizuka Masanori “A New Iron-Base Superalloy for Exhaust Valves” SAE Paper, No. 810032 1981
- Uyehara Norioki Matsunaga Kenkichi Iikubo Tomohito “Effect of Ti/Al ratio and eta phase on the mechanical properties of a precipitation-strengthened Fe-base superalloy” Tetsuo-to-Hagane 67 1981 S505