Pinning Forces Exerted by TiN Particles in Austenite of Structural Steels and Comparison with Driving Forces for Grain Growth and for Static Recrystallisation

Abstract:

Article Preview

In this work the pinning forces exerted by TiN particles in the austenitic phase in two Ti microalloyed steels have been determined and compared with the driving forces for austenite grain growth and for static recrystallisation between hot rolling passes, respectively. TiN precipitate sizes were measured by transmission electron microscopy (TEM) and the precipitated volumes were calculated. These results were then used to calculate pinning forces. The driving forces for recrystallisation were found to be approximately two orders of magnitude higher than the pinning forces, which explains why the austenite in these steels barely experiences hardening during rolling and why the accumulated stress prior to the austenite→ferrite transformation is insufficient (low dislocation density) to refine the ferritic grain.

Info:

Periodical:

Edited by:

P. B. Prangnell and P. S. Bate

Pages:

405-410

Citation:

J.I. Chaves et al., "Pinning Forces Exerted by TiN Particles in Austenite of Structural Steels and Comparison with Driving Forces for Grain Growth and for Static Recrystallisation", Materials Science Forum, Vol. 550, pp. 405-410, 2007

Online since:

July 2007

Export:

Price:

$38.00

[1] C.S. Smith: Trans. Metall. Soc. AIME, Vol. 175 (1948), p.15.

[2] T . Gladman: The Physical Metallurgy of Microalloyed Steels, Ed. The Institute of Materials, London, (1997).

[3] A. Faessel: Rev. Metall., Cah. Inf. Tech., Vol. 33 (1976), p.875.

[4] G. Gottstein and L.S. Shvindlerman: Grain Boundary Migration in Metals, Ed. B. Ralph, CRC press, (1999).

[5] P.A. Beck and P. R. Sperry: J. Appl. Phys. Vol. 25(1950), p.150.

[6] A. S. Keh: Direct Observation of Imperfections in Crystals, Ed. Wiley-Interscience, New York, (1962).

[7] F.J. Humphreys and M. Hatherly: Recrystallization and Related Annealing Phenomen, Ed. Pergamon Press, Oxford, (2003).

[8] N. Gao and T. N. Baker: ISIJ Int. Vol. 38 (1998), p.744.

[9] M.I. Vega, S. F. Medina, M. Chapa and A. Quispe: ISIJ Int. Vol. 39 (1999), p.1304.

[10] M. Gómez, S.F. Medina, P. Valles and A. Quispe: Mater. Sci. Forum, Vols. 480-481 (2005), p.489.

[11] A. Quispe, S. F. Medina and M. Gómez: Rev. Metal. Madrid, Vol. Extr. (2005), p.384.