Tnr Dependent Hot Rolling Microstructure and Texture Development in C-Mn Dual Phase and HSLA Steels

Abstract:

No recrystallization of austenite, Tnr, has an important influence on the transformed phase fractions and the final crystallographic texture after hot deformation. This paper investigates the evolution of microstructure and texture components during hot-rolling in two austenitic region based on Tnr along with three different cooling trajectory and coiling in dual-phase steels and high strength low alloys steel. The recrystallization of the austenite, the austenite deformation followed by the austenite-to-ferrite transformation influence the final microstructure and texture in dual phase steels, have been examined by means of optical microscopy, X-ray diffraction (XRD) measurements. Recrystallized and deformed austenite have clearly different texture components and, due to the specific lattice correspondence relations between the parent austenite phase and its transformation products, the resulting ferrite textures are different as well.

• Periodical: Defect and Diffusion Forum (Volume 391)
• Pages: 120-127
• DOI: https://doi.org/10.4028/www.scientific.net/DDF.391.120
• Online since: February 2019
• Authors: J. Prakash Gautam, A. Miroux, Jaap Moerman, Leo A.I. Kestens
• Keywords: DP Steels, Hot Rolling, Texture, Tnr

References

[1] G. Krauss: Metall. Mater. Trans. B 34 (2003) 781–792.

[2] V. Faccenda, M. Falco and C. Modena: Metall. Ital. 65 (1973) 133–140.

[3] R. Grossterlinden, R. Kawalla, U. Lotter and H. Pircher: Steel Res. 63 (1992) 331–336.

[4] R. A. Grange: Metall. Trans. 2 (1971) 417–426.

[5] M. S. Rashid: Annual Review of Mater. Sci. 11 (1981) 245–266.

[6] J. D. Embury and J. L. Duncan: JOM. 34 (1982) 24–29.

[7] S. W. Thompson and P. R. Howell: Mater. Sci. Technol. 8 (1992) 777–784.

[8] F. Francisca G. Caballero, A. Garcia-Junceda, C. Capdevila and C. Garcıa de Andrés, Materials Transactions, Vol. 47, No. 9 (2006) p.2269.

[9] Offerman et al. Ferrite/pearlite band formation in hot rolled medium carbon steel.

[10] P. Van Houtte: MTM-FHM Software version (2004).

[11] R.K. Ray, J.J. Jonas and M.P. Butron Guilien and J. Savoie, Transformation texture in steels, ISIJ Int. Vol. 34 P 927-942.

[12] L. Kestens and J.J. Jonas Transformation and recrystallization texture associated with processing, ASM Handbook Vol 14A P.685.

[13] T. Waterschoot, L. Kestens and B.C. DeCooman, Metallurgial and Materials Transections A, Vol. 33A (2002), p.1093.