Effect of NbMo Addition on the Precipitation Behaviour of V Microalloyed Steel during Intercritical Annealing

Document Type : Research Paper


Department of Materials Science and Engineering, The University of Sheffield, Sir Robert Hadfield Building, Mappin Street, Sheffield S13JD, UK


This paper reports on the precipitation behaviour and microstructural evolution in ~20% cold rolled NbMoV and V single microalloyed low carbon steels during intercritical annealing. The microstructure and precipitation behaviour were studied by optical and scanning/transmission electron microscopy and microanalysis, X-ray diffraction technique and Vickers hardness testing. After intercritical annealing, the resulting microstructure in both steels comprised acicular/bainitic ferrite matrix with an uneven proportion of allotriomorphic ferrite and retained austenite and martensite. The average density of microalloying precipitates increased in both steels during intercritical annealing. NbV, NbMoV and V carbides were observed in the NbMoV steel, while V-carbide extensively appeared in the V steel. The results also showed a much greater precipitation strengthening in the NbMoV steel after intercritical annealing compared to the V steel. The overall findings suggested that NbMo addition could retard the growth/coarsening of microalloy precipitates with a size of lower than 15nm during the intercritical annealing.


V. F. Zackay, E. R. Parker, D. Fahr and R. Busch: Trans. ASM., 60(1967), 252.
E. Abbasi, Q. Luo and D. Owens: Mater. Sci. Eng. A., 725(2018), 65.
B. C. De. Cooman: Curr. Opin. Solid State Mater. Sci., 8(2004), 285.
S. Allain and T. Iung: Rev. DE Metallurgie-Cahiers D Inf. Technol., 105(2008), 520.
K. I. Sugimoto, Mater. Sci. Technol., 25(2009), 1108.
A. Halder; S. Suwas; D. Bhattacharjee: Proc. Int. Conf. on Microstructure and Texture in Steels and Other Materials., Jamshedpur, 2008.
T. Hojo, K. I. Sugimoto, Y. Mukai and S. Ikeda: ISIJ Int., 48(2008), 824.
K. I. Sugimoto, A. Kanda, R. Kikuchi, S. I. Hshimoto, T. Kashima and S. Ikeda, ISIJ Int., 42(2002), 910.
G. L. Dunlop and R. W. K. Honeycombe: Philos. Mag., 32(1975), 61.
A. Kostryzhev, N. Singh, L. Chen, Ch. Killmore and E. Pereloma: Metals., 8(2018), 134.
T. N. Baker: Ironmaking Steelmaking., 43(2016), 264.
R. N. K. Balliger, Met. Sci., 14(1980), 121.
D. P. Dunne: Mate. Sci. Technol., 26(2010), 410.
H. J. Kestenbach: Mater. Sci. Technol., 13(1997), 731.
G. L. Dunlop and R. W. K. Honeycombe: Met. Sci., 10(1976), 124.
T.Gladman: The physical metallurgy of microalloyed steels, Maney Publishing for the Institute of Materials, 2002.
J. H. Jang, Y. U. Heo, C. H. Lee, H. K. D. H. Bhadeshia and D. W. Suh: Mater. Sci. Technol., 29(2013), 309.
X. Sun and Q. Yong: Int. Seminar on Applications of Mo in Steels, Beijing, 2010.
C. M. Enloe, K. O. Findley, C. M. Parish, M. K. Miller, B. C. De-Cooman and J. G. Speer: Scripta Mater., 68(2013), 55.
J. Naitou, T. Murakami, Sh. Ikeda and K. Okita: Patent US 2014/0044585 A1, 13 Feb 2014.
E. Abbasi and W. M. Rainforth: Mater. Sci. Eng. A., 651(2016), 822.
M. D. Meyer, D. Vanderschueren, K. D. Blauwe and B. C. De-Cooman: in Mechanical Working and Steel Proc. Conf., (1999).
T. Siwecki, J. Eliasson, R. Langneborg and B. Hutchinson: ISIJ Int., 50(2010), 760.
J. O. W. B. S. Zaefferer: Acta Mater., 52(2004), 2765.
M. A. Altuna, A. Iza-Mendia and I. Gutierrez: Metall. Mater. Trans. A., 43A(2012), 4571.
R. M. Poths, R. L. Higginson and E. J. Palmiere: Scripta Mater., 44(2001), 147.
K. I. Sugimoto, J. Sakaguchi, T. Iida and T. Kashima: ISIJ Inter., 40(2000), 920.
T. Furuhara, T. Yamaguchi, G. Miyamoto and T. Maki: Mater. Sci. Technol., 26(2010), 392.
A. A. M. Hamzeh: Mater. Sci. Eng. A., 593(2014), 24.
Y. M. A. V. H. M. A. S. Hossein Nedjada: Mater. Sci. Eng. A., 528(2011), 1521.
H. K. D. H. Bhadeshia and R. Honeycombe: Steels Microstructure and Properties, Third ed., Elsevier Ltd., (2003), 25.
L. R. H. R. Abbaschian: Physical Metallurgy Principles, Fourth Edition ed., Cengage Learning, (2009).
M. F. J. Humphreys: Recrystallization and Related Annealing Phenomena, Second, Ed., Elsevier, (2004).
N. Y. Y. R. Ueji: Acta Mater., 50(2002), 4177.
C. Scott, F. Perrard and P. Barges: Int. Seminar 2005 on Application Technologies of Vanadium in Flat – Rolled Steels, Suzhou, China, 2005.
N. K. Balliger and R. W. K. Honeycombe: Metall. Trans. A., 11A(1980), 421.
T. N. Baker: Mater. Sci. Technol., 25(2009), 1083.
D. A. Porter, K. E. Easterling and M. Y. Sherif: Phase Transformations in Metals and Alloys, Third ed., CRC press, (2009).
M. G. Akben, B. Bacroix and J. J. Jonas: Acta Metall., 31(1983), 161.
R. W. K. Honeycombe: Fundamental Aspects of Precipitation in Microalloyed Steels, in Metallurgy and Applications, (1986).
T.Gladman: Mater. Sci. Techn., 15(1999), 30.