Recrystallization Behavior of Deep Drawing Low Carbon Steel Sheets Produced by Mobarakeh Steel Plant

Document Type: Research note

Authors

1 Department of Metallurgy, Shahid Bahonar University, Kerman, Iran

2 International Center for Science and High Technology and Environmental Science, Kerman, Iran

Abstract

In the present work the recrystallization behavior of deep drawing grade Al-killed low carbon steel sheets produced by Mobarakeh Steel Plant (MSP) has been studied. Salt bath isothermal annealing has been applied to cold rolled samples and the resulted microstrucrures have been compared with the microstructure obtained from the box annealing process in MSP. It is found that at 635 and 700ºC the isothermal annealing produces equiaxed grains, while box annealing process presents an elongated grain structure. The recrystallization fractions have been measured using the point counting method. The linear intercept method has been employed to measure the grain size. It is revealed that at 550ºC, in salt bath annealing, recrystallization is stopped after 50% recrystallization with elongated new grains. Constant grain sizes upon holding after recrystallization at 635 and 700ºC during isothermal annealing show that the grain growth is stopped. Further holding at 700ºC results an abnormal grain growth in the recrystalized microstructure. The hardness variations during annealing, with a decrease at the beginning of annealing followed by an increase trend at all temperatures, show a good consistency with microstructural observations. Investigation of the results leads to the conclusion that a precipitation process occurs during annealing which greatly affects both restoration processes and resulted microstructure as well as the properties. The effect of the precipitation process depends on the time of its occurrence with respect to each restoration process. A Relatively high value of 315 KJ/mole for recrystallization activation energy has been related to the simultaneous occurrence of recrystallization and precipitation processes.

Keywords


[1] R. P. Singh, k. A. Padmanabhan, S. Mishra, Manuf. Sci. Eng., ASME 2 (1994), 583.

[2] C. Huashi, T. Okamato, Sheet Metal Industry, 55(1978), 1234.

[3] B. K. Panigrahi, Bull. Mater. Science., 24(2001), 361.

[4] T. Nakmara, K. Esaka, International Conference on Physical Metallurgy of Thermomechanical Processing of Steels and Other Metals, THERMEC-88,Tokyo, (1988), 644.

[5] H. J. McQueen, J. J. Jonas, “Recovery and Recrystallization During High Temperature Deformation”, Treaties on Materials Science and Technology, Vol. 6, “Deformation of Metals”,New York, Academic Press, (1975), 393.

[6] W. B. Hutchinson, Int. Mater. Rev., 29(1984), 25.

[7] P. A. Beck, Advanced in Physics, 3(1954), 245.

[8] J. J. Irani, P. R. Taylor, Iron and Steel Institute, Special Report No 108(1968), 83.

[9] I. Samajdar, B. Verlinden,I.Kestens and P. Van Houtte, Acta Mater, 47(1999), 55.

[10] R. D. Doherty, D. A. Hughes, F. J. Humphreys, J. J. Jonas, D. Juul Jensen, M. E. Kassner, W. E. King, T. R. McNelly, H. J. McQueen, A. D. Rollett, Mater. Sci.Eng., A238(1997), 219.

[11] F. G. Wilson, T. Gladman, Int. Mater. Rev., 33(1988), 221.

[12] Y Y. Kang, H. Yu, J. Fu, K. Wang, and Z. Wang, Mater. Sci.Eng., A351(2003), 265.

[13] G. H. Akbari, C. M. Sellars, and J. A. Whiteman, Mater. Sci. Tech., 18(2002), 885.

[14] T. Furu, K. Marthinsen, E. Nes, Mater. Sci. Forum, 113-115(1993), 41.

[15] M. R. Barnett, J. J. Jonas, ISIJ Int., 37(1997), 697.

[16] A. L. Wingrove, J. Inst. Metals, 100(1972), 313.

[17] S. Horiuchi, K. Asakura, G. Wassermann, and J. Grewen, Texture, 2(1975), 17.

[18] A. S. Malin, M. Hatherly, Metal Sci., 13 (1979), 463.

[19] J. H. Carins, J. Clough, M. A. Dewey and J. Nutting, J. Inst. Metals, 99(1971), 93.

[20] G. J. Baxter, D. Duly, P. L. Orsetti Rossi, C. M. Sellars, J. A. Whiteman, H. R. Shercliff and M. f. Ashby, Processing of the 16th Riso International Symposium on Materials science: Microstructural and Crystallographic Aspect of Recrystallization, ed. N. Hansen, D. Jull Jensen, Y. L. Liu and B. Ralph, Riso National Laboratory, Roskilde, Denmark, (1995), 267.

[21] M. Kiaei, R. Chiron, and B. Bacroix, Scripta Mater., 36(1997), 659.

[22] F. J. Humphreys, M. Hatherly, “Recrystallization and Related Annealing Phenomena”, Pergamon Press,Oxford, (1995), 186.

[23] M. R. Barnet, J. J. Jonas and P. D. Hodgson, 37th Mechanical Working and Steel Processing Conference and International Symposium on Recovery and Recrystallization in Steel Processing, Hamilton, Ontario, Canada October 22-25, 1995, A Publishing of the Iron and Steel Society, (1996), 971.

[24] G. H. Akbari, Ph.D. Thesis, TheUniversityofSheffield.1997.

[25] R. Mendoza, A. Molina, F. Serrania and J. A. Juraez-Islas, Scripta Mater., 48(2003), 391.

[26] R. L. Solter, C. W. Beattie, Transactions AIME, 191(1951), 721.

[27] W. C. Leslie, Transaction of ASM, 46(1954), 1470.

[28] R. K. Ray, J. J. Jonas and R. E. Hook‚ Int. Mater. Rev., 39(1994), 129.

[29] D. O. Wilshynsky-Dresler, D. K. Matlock and G. Kruass, Proc. of 37th Mechanical Working and Steel Processing Conference and International Symposium on Recovery and Recrystallization in Steel Processing, Hamilton, Ontario, Canada, October 22-25, 1995, A Publishing of the Iron and Steel Society (1996), 927.