Effect of Processing Route on Mechanical Behavior of C-Mn Multiphase High Strength Cold Rolled Steel


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The multiphase steels have complex microstructures containing polygonal ferrite, martensite, bainite, carbide and a small amount of retained austenite. This microstructure provides these steels with a high mechanical strength and good ductility. Different thermal cycles were simulated in the laboratory in order to create the microstructures with improved mechanical properties. The samples were heated to various annealing temperatures (740, 760 or 780°C), held for 300 s, and then quickly cooled to 600 or 500°C, where they were soaked for another 300 s and then submitted to the accelerated cooling process, with the rates in the range of 12-30°C/s. The microstructure was examined at the end of each processing route. The mechanical behavior evaluation was made by microhardness testing. The microstructural characterization involved optical microscopy (OM), X-ray diffraction (XRD), scanning electron microscopy (SEM) with electron backscattering diffraction (EBSD) and transmission electron microscopy (TEM). The use of multiple regression analysis allowed the establishment of quantitative relationship between the microstructural parameters, cooling rates and mechanical properties of the steel.



Materials Science Forum (Volumes 539-543)

Main Theme:

Edited by:

T. Chandra, K. Tsuzaki, M. Militzer , C. Ravindran




D. B. Santos et al., "Effect of Processing Route on Mechanical Behavior of C-Mn Multiphase High Strength Cold Rolled Steel", Materials Science Forum, Vols. 539-543, pp. 4375-4380, 2007

Online since:

March 2007




[1] D.C. Horvath, J.R. Fekete: Advanced High Strength Sheet Steels for Automotive Applications. Colorado, USA, (2004), pp.3-10.

[2] A.J. DeArdo: Mater. Sci. Forum Vol. 49-56 (2003), p.426.

[3] C. Mesplont, B.C. De Cooman: Iron and Steel Vol. 23 (2002), p.39.

[4] D.T. Lewellyn , D.J. Hillis . Iron and Steelm. Vol. 23 (1996), p.471.

[5] A. Pichler, S. Traint, G. Arnoldner, E. Werner, R. Pippan, P. Stiaszny: 42° Mechanical Working and Steel Processing Conf. Proc. Toronto, Canada, October, 22-25 (2000), pp.573-593.

[6] A.B. Cota, R. Barbosa, D.B. Santos: J. of Mater. Proc. Tech. Vol. 100 (2000), p.156.

[7] F. Silva, N.I.A. Lopes and D.B. Santos: Mater Charact. Vol. 56 (2006), p.3.

[8] K.W. Andrews: J. of Iron and Steel Inst. Vol. 203 (1965), p.721.

[9] G. Krauss: Steels: Heat Treatment and Processing Principles. (ASM, USA1990), p.14.

[10] R.W.K. Honeycombe, H.K.D. H Bhadeshia: Steels, Microstructure and Properties, (Edward Arnold, 2nd Ed, England, 1995) p.103.

[11] F.S. LePera: J. of Metals. Vol. 32 (1980), p.38.

[12] L.F. Ramos, D.K. Matlock, G. Krauss: Met. Trans. A. Vol. 10 (1979), p.259.

[13] G.R. Speich, V.A. Demarest, M.L. Miller: Met. Trans. A Vol. 12 (1981), p.1419.

[14] H-J. Bunge, C.M. Vlad, H-H Kopp: Arch. Eisenh. Vol. 55 (1984) p.163.

[15] S. Estay, L. Cheng, G.R. Purdy: Canadian Metall. Quarterly Vol. 23 (1984), p.121.

[16] E. Bartluci, M.R. Magalhães, R. Barbosa, D.B. Santos: 15 a. Conferencia de Laminación. Buenos Aires, Argentina, November. (2004).

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