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Development of High-strength, Nitrocarburized Crankshaft with Control of Vanadium Carbonitride Precipitation by Normalization

Article of Honda R&D Technical Review Vol.22 No.1

Summary

A high-strength crankshaft with a high productivity has been developed. This crankshaft development sought to balance high fatigue strength, machinability and straightening ability. Vanadium is known as a precipitation strengthening element, and the development focused on the fact the amount of solid solution of vanadium in steel is dependent on the heating temperature. A material was developed in which a high level of strength could be achieved through control of the normalizing temperature, for which conditions could more easily be set, rather than controlled cooling following hot forging. Optimization of the normalizing temperature helped to enable the achievement of a 30% or more increase in fatigue strength against the existing material, while maintaining machinability and straightening ability.

Reference

(1) Iida, Z., Takada, K., Suzuki, S., Sato, C.: Development of Light Weight Connecting Rod, Honda R&D Technical Review, Vol. 17, No. 2, p. 115-121 (in Japanese)
(2) Matsubara, T., Satoh, Y., Iida, Z., Taguchi, T.: Development of a High Fatigue Strength Free Machining Microalloyed Steel for Connecting Rods, HONDA R&D Technical Review, Vol. 4, p. 73-85 (in Japanese)
(3) Nakamura, S., Hatano, A.: High Strength and High Toughness Microalloyed Steel Bar for Steering Racks, DENKI-SEIKO, Vol. 69, No. 1, p. 73-78 (in Japanese)
(4) Amataka, A., Suwa, S.: Development of Pb-free Freecutting Steel Enabled to Omit Normalizing for Crankshafts, Honda R&D Technical Review, Vol. 14, No.1, p. 141-148 (in Japanese)
(5) Nishizaka, T., Sato, Y.: A Study on the Preventive Method of Fretting Corrosion Damage, Journal of Japanese Society of Tribologists, Vol. 40, No. 9, p. 768-775 (in Japanese)
(6) Inoue, K., Matsumura, Y.: Influence of Alloying Elements on Hardness Distribution after Nitrocarburizing in Medium Carbon Steel, DENKI-SEIKO, Vol. 75, No. 1, p. 11-18
(in Japanese)
(7) Tahara, Y., Shimizu, S.: Development of Pb-free Freecutting Microalloyed Steel with High Toughness for Crankshaft of Small Multipurpose Engine, Honda R&D Technical Review, Vol. 16, No. 2, p. 191-196 (in Japanese)
(8) DAIDO STEEL CO., LTD. SPECIAL STEEL HANDBOOK, p. 518 (2001) (in Japanese)

Author (organization or company)

Satoru SUWA(Motorcycle R&D Center)、Daiji KAWAGUCHI(Motorcycle R&D Center)、Atsushi MURAKAMI(Motorcycle R&D Center)、Kazuyoshi KIMURA(Daido Steel Co., Ltd.)、Masato TADA(Daido Steel Co., Ltd.)

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