Model Alloys to Study the Solute Drag and Precipitation Effect on the Recrystallization Kinetics of Nb-Microalloyed Steels


Article Preview

A good combination of strength and toughness in HSLA steels can be achieved by the addition of microalloying elements such as Nb. Nb can retard the static recrystallization of austenite at low temperatures by either a solute drag or by a precipitation pinning (when bonded to C or N) effect. Both mechanisms result in improved mechanical properties due to grain size refinement of the transformed ferrite. In this study, 3 Nb-microalloyed model alloys were designed to investigate the solute drag and the precipitation effect separately. The first alloy, containing a stoechiometric ratio of Nb and C, was designed to study the retarding effect of NbC on the recrystallization behavior. A second alloy, containing Nb and only few ppm C, was casted in order to study the effect of Nb in solid solution. The two alloys were compared with a C-Mn reference alloy. The recrystallization behavior of the three alloys were compared by multi-hit torsion tests and double hit compression tests. The Nb-C and the Nb-very low C showed small differences in recrystallization behavior. These results show that Nb delays the recrystallization by a solute drag effect or by the formation of a very small amount of precipitates.



Materials Science Forum (Volumes 558-559)

Edited by:

S.-J.L. Kang, M.Y. Huh, N.M. Hwang, H. Homma, K. Ushioda and Y. Ikuhara




S. Vervynckt et al., "Model Alloys to Study the Solute Drag and Precipitation Effect on the Recrystallization Kinetics of Nb-Microalloyed Steels", Materials Science Forum, Vols. 558-559, pp. 369-375, 2007

Online since:

October 2007




[1] R. Abad, B. Lopez and I. Gutierrez, Materials Science Forum, Vols. 284-286, 1998, 167-174.

[2] A. Kojima, Y. Watanabe, Y. Terada, A. Yoshie and H. Tamehiro, ISIJ international, Vol. 36, No. 5, 1996, 603-610.

DOI: 10.2355/isijinternational.36.603

[3] K. Lücke, K. Detert, Acta. Met. Vol. 5, 1957, S. 628.

[4] J.W. Cahn, Acta Metallurgica, Vol. 10, sept 1962, 789-798.

[5] R.C. Hudd, A. Jones, M.N. Kale, JISI, Vol. 209, 1971, 121-125.

[6] T.M. Maccagno, J.J. Jonas, S. Yue, B.J. McCrady, R. Slobodian, D. Deeks, ISIJ international, Vol. 34, No. 11, 1994, 917-922.

DOI: 10.2355/isijinternational.34.917

[7] A. Gräber and K. Pöhlandt, Steel research, Vol. 61, No. 5, 1990, 212-218.

[8] M. Gomez, S.F. Medina, P. Valles, Proc. of 2nd Int. Conf. on Thermomechanical Processsing of Steels, 2004, Liège, Belgium, 157-164.

[9] G. Li, T.M. Maccagno, D.Q. Bai, J.J. Jonas, ISIJ International, Vol. 36, No. 12, 1996, 14791485.

[10] A.I. Fernandez, B. Lopez, J.M. Rodriguez-Ibabe, Scripta Materialia, Vol. 40, No. 5, 1999, 543549.

[11] D.Q. Bai, S. Yue, W.P. Sun and J.J. Jonas, Metallurgical Transactions A, Vol 24A, oct. 1993, 2151-2159.

Fetching data from Crossref.
This may take some time to load.