The Effect of Severe Plastic Deformation on the Brittle-Ductile Transition in Low Carbon Steel


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Brittle-ductile transition (BDT) behaviour was investigated in low carbon steel deformed by an accumulative roll-bonding (ARB) process. The temperature dependence of its fracture toughness was measured by conducting four-point bending tests at various temperatures and strain rates. The fracture toughness increased while the BDT temperature decreased in the specimens deformed by the ARB process. Arrhenius plots between the BDT temperatures and the strain rates indicated that the activation energy for the controlling process of the BDT was not changed by the deformation with the ARB process. It was deduced that the decrease in the BDT temperature by grain refining was not due to the increase in the dislocation mobility controlled by short-range barriers. Quasi-three-dimensional simulations of dislocation dynamics, taking into account of crack tip shielding due to dislocations, were performed to investigate the effect of a dislocation source spacing along a crack front on the BDT. The simulation indicated that the BDT temperature is decreased with decreasing in the dislocation source spacing. Molecular dynamics simulations revealed that moving dislocations were impinged against grain boundaries and were reemitted from there with increasing strain. It indicates that grain boundaries can be new sources in ultra-fine grained materials, which increases toughness at low temperatures.



Materials Science Forum (Volumes 633-634)

Edited by:

Yonghao Zhao and Xiaozhou Liao




M. Tanaka et al., "The Effect of Severe Plastic Deformation on the Brittle-Ductile Transition in Low Carbon Steel", Materials Science Forum, Vols. 633-634, pp. 471-480, 2010

Online since:

November 2009




[1] N. Tsuji, S. Okuno, Y. Koizumi and Y. Minamino: Mater. Trans. Vol. 45 (2004), p.2272.

[2] B.S. Majumdar and S.J. Burns: Acta Metall. Vol. 29 (1981), p.579.

[3] J.R. Rice and R. Thomson: Philos. Mag. Vol. 29 (1974), p.73.

[4] J. Samuels and S.G. Roberts: Proc. R. Soc. Lond. A Vol. 421 (1989), p.1.

[5] H.S. Kim and S. Roberts: J. Am. Ceram. Soc. Vol. 77 (1994), p.3099.

[6] S. Fujita, K. Maeda and S. Hyodo: Philos. Mag. A Vol. 65 (1992), p.131.

[7] P.B. Hirsch, A.S. Booth, M. Ellis and S.G. Roberts: Scripta Mater. Vol. 27 (1992), p.1723.

[8] J.M. Hodge, R.D. Manning and H.M. Reichhold: Trans. Am. Inst. Min. Metall. Eng. Vol. 185 (1949), p.233.

[9] E.O. Hall: Proc. Phys. Soc. Vol. B64 (1951), p.747.

[10] J.F. Brown, Jr. and J.E. Srawley: ASTM STP Vol. 410 (1966), p.1.

[11] M. Tanaka, K. Higashida, T. Shimokawa and T. Morikawa: Mater. Trans. Vol. 50 (2009), p.56.

[12] Y. Mishin, D. Farkas, M.J. Mehl and D.A. Papaconstantopoulos: Phys. Rev. B Vol. 59 (1999), p.3393.

[13] T. Shimokawa, T. Hiramoto, T. Kinari and S. Shintaku: Mater. Trans. Vol. 50 (2009), p.2.

[14] R. Thomson, in: F. Seitz and D. Turnbull (Eds. ), Solid State Physics, vol. 39, Academic Press, INC., Orlando, San Diego, New York, Austin, Boston, London, Sydney, Tokyo, Toronto, 1986, p.1.


[15] K. Higashida and N. Narita: JJAP Ser. 2, Lattice Defects in Ceramics Vol. 1989), p. (1989).

[16] I.H. Lin and R. Thomson: Acta Metall. Vol. 34 (1986), p.187.

[17] N. Narita, K. Higashida and S. Kitano: Scripta Metall. Vol. 21 (1987), p.1273.

[18] J. Weertman: Acta Metall. Vol. 26 (1978), p.1731.

[19] K. Higashida, N. Narita, M. Tanaka, T. Morikawa, Y. Miura and R. Onodera: Philos. Mag. A Vol. 82 (2002), p.3263.

[20] M. Tanaka and K. Higashida: Mater. Sci. Eng., A Vol. 400-401 (2005), p.426.

[21] P.B. Hirsch and S.G. Roberts: Philo. Trans. Roy. Soc. Lond. Ser. A Vol. 355 (1997), p. (1991).

[22] G. Michot, M.A.L. de Oliveira and G. Champier: Mater. Sci. Eng., A Vol. 272 (1999), p.83.

[23] S.G. Roberts, P.B. Hirsch, A.S. Booth, M. Ellis and F.C. Serbena.: Phys. Scr. Vol. T49 (1993), p.420.

[24] A.P.L. Turner and J. T. Vreeland: Acta Metall. Mater. Vol. 18 (1970), p.1225.

[25] D. Brunner and J. Diehl: Phys. Stat. Sol. (a) Vol. 124 (1991), p.455.

[26] B. Mutasa and D. Farkas: Surf. Sci. Vol. 415 (1998), p.312.