Development of Anti-Coarsening Steel for Carburizing


Article Preview

There is a glaring need for omitting intermediate heat treatments in the manufacturing processes of carburized parts and increasing the carburizing temperature aimed at cost reduction. It is necessary to develop techniques to inhibit grain-coarsening since some austenite grains tend to grow abnormally during carburizing and coarse grains have negative effects on the properties of parts. Therefore, we developed new techniques to inhibit grain-coarsening by refining precipitates’ size and increasing their volume fraction based on the abnormal grain growth theory by Gladman. In this study, AlN and Nb(CN) were chosen as the precipitate particles for the pinning of austenite grain growth. And we investigated grain-coarsening behavior in several manufacturing processes of parts. As a result, we developed anti-coarsening steels for various manufacturing processes of carburized parts.



Materials Science Forum (Volumes 539-543)

Main Theme:

Edited by:

T. Chandra, K. Tsuzaki, M. Militzer , C. Ravindran




M. Kubota and T. Ochi, "Development of Anti-Coarsening Steel for Carburizing", Materials Science Forum, Vols. 539-543, pp. 4855-4860, 2007

Online since:

March 2007





[1] T. Nishizawa: Tetsu-to-Hagané Vol. 70(1984), p. (1984).

[2] T. Gladman: Proc. Roy. Soc. A. Vol. 294(1966), 298.

[3] T. Gladman, F.B. Pickering: Journal of The Iron and Steel Institute Vol. 205(1967), p.653.

[4] S. Kinoshita, T. Ueda, A. Suzuki: Journal of Japan Institute of Metals Vol. 36(1972), p.403.

[5] S. Kinoshita, T. Ueda, A. Suzuki: Tetsu-to-Hagané Vol. 59(1973), p.1125.

[6] K. Fujita, T. Sakari, M. Ohnishi, T. Noma: Tetsu-to-Hagané Vol. 59(1973), p.1131.

[7] Y. Koyasu: Heat Treatment Vol. 26(1986), p.405.

[8] N. Harada, Y. Yamada, K. Katoh: Mitsubishi Motors Technical Review Vol. 12(2000), p.47.

[9] Y. Ureshino, O. Nakano, K. Fukuda, T. Fujiwara, Y. Fukuda: Toyota Technical Review Vol. 52(2002), p.84.

[10] K. Fujiwara, Y. Date, T. Ariyasu: Mitsubishi Motors Technical Review Vol. 13(2001).