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Development of Nickel-Base Superalloy for Exhaust Valves
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Abstract
These days, nickel-base superalloy has been applied to reduce the valve weight of motorcycles. Inconel 751 is excellent in performance but expensive in cost. Therefore, we verified the constituents of nickel-base superalloys corresponding to the requirements of valves and we succeeded in developing a new superalloy and applying it to motorcycle exhaust valves.
The characteristics are summarized as follows:
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1.
The basic composition is Fe-46Ni-18Cr-4Ti-1Al-0.3C-0.004B. It is a precipitation-hardened nickel alloy characterized by precipitation of Ni3 (Al,Ti) and, crystallization and dispersion of fine TiC.
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2.
It has the following distinctive features.
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(1)
Superior to Inconel 751 in wear and heat resistance.
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(2)
Superior to 20-11P steel in resistance to lead oxide corrosion.
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(3)
Applicable to both unleaded and low-lead gasoline.
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(1)
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3.
The exhaust valves using this new superalloy are lighter in weight by 18% and lower in cost by 13% as compared to the conventional type using 20-11P hard-faced with Stellite. They have been mass-produced from 1990.
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Citation
Hagiwara, Y., Ishida, M., Oka, T., Watanabe, R. et al., "Development of Nickel-Base Superalloy for Exhaust Valves," SAE Technical Paper 910429, 1991, https://doi.org/10.4271/910429.Also In
References
- Isobe S. Matsunaga K. Takagi Y. Sato N. “Superalloy for Exhaust Valves” Japanese Patent Application Laid-opened No. 60-46343 1985
- Watanabe R. Takagi Y. “Nickel-base Superalloy for Exhaust Valves” Japanese Patent Application Laid-opened No. 60-70155 1985
- Kato T. Uyehara N. Matsunaga K. Isomura T. Matsuno M. Iizuka M. “A New Iron-Base Superalloy for Exhaust Valves” SAE paper 810032 1981
- Kato T. Fujikura M. Iikubo T. Isomura T. Matsuno M. Hirayama H. “Application of a Newly Developed Iron-Base Superalloy to Exhaust Valves of Disel Engines” SAE paper 830253 1983
- Hagiwara Y. “Trend of Superalloy for Automobiles” The Special Steel 39 10
- Watanabe R. “Alloy Design of High Strength, High Corrosion Resistant Nickel-based Alloy, “Hicory”, Using the Zero-Order Approximation Phase Synthesizing Method” Hitachi Metals Technical Review 3 1987 2 7
- Jenkins L. F. Larson J. M. “The Development of a New Austenitic Stainless Steel Exhaust Valve Material” SAE paper 780245 1978
- Caird S.B. Trela D. M. “High Temperature Corrosion-Fatigue Test Method for Exhaust Valve Alloys” SAE paper 810033 1981