OPTIMIZED BAINITIC VANADIUM-MICROALLOYED 700 MPA STRIP STEEL: MICROSTRUCTURE, TOUGHNESS, AND WELDABILITY
Keywords:
Vanadium microalloyed steel, precipitation behavior, thermomechanical processing, mechanical properties, microstructure evolution, grain refinement, phase transformation, strengthening mechanisms, high-strength low-alloy (HSLA) steel, precipitation kinetics.Abstract
This study investigates the microstructure, mechanical properties, and weldability of vanadium-microalloyed bainitic 700 MPa hot-rolled strip steel. The research highlights the role of alloying elements such as Mn, Cr, and Mo in achieving a fully bainitic microstructure and the impact of coiling temperatures on mechanical properties. The study also explores the strengthening mechanisms provided by vanadium microalloying, which enhances the stability of mechanical properties over a
wide range of processing conditions. The findings confirm that vanadium contributes significantly to toughness, ductility, and weldability, making this steel suitable for industrial applications requiring high strength and formability.
References
1.
A.P. Singh, B. Singh, K.K. Saxena, "Precipitation behaviour of microalloyed
steel during hot deformation", Materials Today: Proceedings, Vol. 18, 2019, pp. 4821
4825.
2.
P. Gong, E.J. Palmiere, W.M. Rainforth, "Characterisation of strain-induced
precipitation behaviour in microalloyed steels during thermomechanical controlled
processing", Materials Characterization, Vol. 124, 2017, pp. 83–89.
3.
B.K. Show, R. Veerababu, R. Balamuralikrishnan, G. Malakondaiah, "Effect
of vanadium and titanium modification on the microstructure and mechanical
properties of a microalloyed HSLA steel", Materials Science and Engineering: A, Vol.
527, No. 6, 2010, pp. 1595–1604.
4.
F. Fang, Q.L. Yong, C.F. Yang, S.U. Hang, "A model for precipitation kinetics
in vanadium microalloyed steel", Journal of Iron and Steel Research International,
Vol. 17, No. 2, 2010, pp. 36–42.
5.
S. Gündüz, R.C. Cochrane, "Influence of cooling rate and tempering on
precipitation and hardness of vanadium microalloyed steel", Materials & Design, Vol.
26, No. 6, 2005, pp. 486–492.6.
F. Vodopivec, B. Šuštatrčić, T.J. Vojvodić, G. Kosec, "Charpy notch toughness
and hardness of reheated martensite and lower bainite", Metalurgija, Vol. 49, No. 3,
2010, pp. 149–154.
7.
Y. Wang, D. He, C. Yu, J. Jiang, "Effect of vanadium on the properties of Fe
Cr-C hardfacing alloy", Hanjie Xuebao/Transaction of the China Welding Institution,
Vol. 31, No. 5, 2010, pp. 61–64.
8.
N. Radović, A. Koprivica, D. Glišić, A. Fadel, Đ. Drobnjak, "Influence of Cr,
Mn and Mo on the structure and properties of V microalloyed medium carbon forging
steels", MJoM - Journal of Metallurgy, Vol. 16, No. 1, 2010, pp. 1–9.
9.
H. Schuman, Metallography, Faculty of Technology and Metallurgy, Belgrade,
1989.
10.
M. Radulović, M. Fiest, K. Peev, "Effect of rare earth elements on
microstructure and properties of high chromium white iron", Materials Science and
Technology, Vol. 10, No. 12, 1994, pp. 1057–1062.
11.
T.N. Baker, "Processes, microstructure and properties of vanadium
microalloyed steels", Materials Science and Technology, Vol. 25, No. 9, 2009, pp.
1083–1107.
12.
W.B. Hutchinson, "Microstructure development during cooling of hot rolled
steels", Ironmaking & Steelmaking, Vol. 28, 2001, pp. 145–151.
13.
T. Gladman, The Physical Metallurgy of Microalloyed Steels, London, Institute
of Materials, 1997.
14.
T.
M. Korchynsky (ed.), Microalloying '95, Iron and Steel Society, Pittsburgh,
PA, USA, 1995.
15.
Siwecki, J. Eliasson, R. Lagneborg, B. Hutchinson, "Vanadium
microalloyed bainitic hot strip steels", ISIJ International, Vol. 50, 2010, pp. 760–767.
