Influence of Repeated Quenching After Carburizing on Prior Austenite Grain Size


Article Preview

High strengths and impact values are required for carburizing steels used for automotive drive train parts. It is well known that the finer-grain microstructures are favorable for these properties. In this study, with a view to effective refining of grain size with controlling the alloying elements, influence of Mn and Cr content on prior austenite grain size after carburizing and repeated quenching was investigated on Ti-modified carburizing steels with ferrite and pearlite microstructure. It was found that the increase in Mn and Cr contents in steels were effective for the grain refining. These effects were attributed to fine ferrite and pearlite microstructure caused by the lowered Ar3 point due to higher Mn content, and retarding the grain growth of austenite by the fine dispersion of carbides in the carburized layer of specimen due to higher Cr content.



Materials Science Forum (Volumes 561-565)

Main Theme:

Edited by:

Young Won Chang, Nack J. Kim and Chong Soo Lee




T. Fujimatsu et al., "Influence of Repeated Quenching After Carburizing on Prior Austenite Grain Size", Materials Science Forum, Vols. 561-565, pp. 2345-2348, 2007

Online since:

October 2007




[1] R.A. Grange: Metall. Trans., Vol. 2 (1971), p.65.

[2] M. Nishikawa and K. Hiraoka: CAMP-ISIJ, Vol. 19 (2006), p.1220.

[3] T. Tamatani, M. Iguchi, T. Sato and K. Tsubota: Netsu Shori, Vol. 37 (1997), p.356.

[4] M. Tokizane, N. Matsumura, K. Tsuzaki, T. Maki and I. Tamura: Metall. Trans. A, Vol. 13A (1982), p.1379.

[5] G. Krauss: Metall. Trans. A, Vol. 9A (1978), p.1527.

[6] Y. Usui, T. Hamada and N. Murai: CAMP-ISIJ, Vol. 19 (2006), p.483 (a) (b) (c) 2µm Fig. 5 Scanning electron micrograph of steel C at 0. 2mm under the surface after carburizing. 2µm.