Effect of austenite deformation and chemical composition on the microstructure and hardness of low-carbon and ultralow-carbon bainitic steels
- 83 Downloads
The effect of hot deformation and chemical composition on the microstructure and hardness of experimental grades of low-carbon and ultralow-carbon C-Mn-Mo-Nb-B steels is studied by the method of physical simulation. It is shown that deformation of austenite at a temperature below that of recrystallization leads to formation of polygonal ferrite and high-temperature ferrite with bainitic morphology. The effect is the most pronounced in boron-bearing steels. Simultaneous alloying with Mo, Nb, and B seems to be the most effective for ensuring high hardness.
KeywordsMicrostructure Ferrite Austenite Recrystallization Transport Phenomenon
Unable to display preview. Download preview PDF.
- 2.C. Mesplont, T. Waterschoot, S. Vandeputte, et al., “Hot rolled bainitic steels,” in: Thermomechanical Processing of Steels, 24–26 May 2000, IOM Communications, London (2000), pp. 495–504.Google Scholar
- 3.G. Buzzichelli and E. Anelli, “Present status and perspectives of European research in the field of advanced structural steels,” ISIJ Int., 42(12), 1354–1363 (2002).Google Scholar
- 4.I. Tamura, H. Sekine, T. Tanaka, and C. Ouchi, Thermomechanical Processing of High-Strength Low-Alloy Steels, Butterworth and Co., London (1998), pp. 1–248.Google Scholar
- 5.T. Siwecki, L. Blaz, and S. Petterson, in: HSLA Steels’2000, 30 Oct.–2 Nov. 2000, Metallurgical Industry Press, Beijing (2000), pp. 504–510.Google Scholar
- 6.D. Q. Bai, S. Yue, T. Maccagno, and J. J. Jonas, ISIJ Int., 36(8), 1084–1093 (1996).Google Scholar
- 7.T. Araki (ed.), Atlas for Bainitic Microstructures, Vol. 1, Continuous cooled Zw-Microstructures of Low Carbon Steels, Iron and Steel Institute, Tokyo (1992), pp. 1–165.Google Scholar
- 8.P. A. Monohar, T. Chandra, and C. R. Killmore, ISIJ Int., 36(12), 1486–1492 (1996).Google Scholar
- 9.K. Fujiwara and S. Okakuchi, in: Microalloying in Steels, 7–9 Sept. 1998, Donostia-San Sebastian, Spain, Trans. Tech. Publ. Ltd. (1998), pp. 271–278.Google Scholar
- 10.P. Cizek, B. P. Wynne, C. H. J. Davies, et al., Metall. Trans. A, 33A, 1331–1349 (2002).Google Scholar
- 11.W. B. Lee, S. G. Hong, C. G. Park, et al., in: Thermomechanical Processing of Steel, 24–26 May 2000, IOM Communications, London (2000), pp. 159–167.Google Scholar
- 12.J. G. Williams, C. R. Killmore, P. D. Edwards, and P. G. Kelly, Thermec’97, Int. Conf. Thermomechanical Processing of Steels and Other Materials, TMS (1997), pp. 475–478.Google Scholar