Microstructure and Properties of a Low Carbon Ti-V Microalloyed Steel

  • Xinhua Pei (裴新华)
  • Zhenyu Liu
  • Jiao Wei
  • Xuefeng Liu
  • Tao Jia (贾涛)Email author
  • Hengfa Hu
Metallic Materials


Due to the largely inhomogeneous deformation among constituent phases, the advanced high-strength multi-phase steels are always facing challenges when applied to automotive parts where local formability is critically required. In this work, two characteristic microstructures were produced from a low carbon Ti-V microalloyed steel by varying the cooling path. In the ferrite single-phase microstructure resulted from “ultra-fast cooling (UFC) + furnace-cooling (FC)”, the hole-expanding ratio of 200% and tensile strength of 647 MPa were achieved. In the ferrite-bainite-martensite (F+B+M) multi-phase microstructure produced by “UFC + air-cooling (AC) + UFC”, the ferrite has been strengthened by Ti-V carbides to promote the strain partitioning, which resulted in the tensile strength of ≥780MPa, a moderate elongation and hole-expanding ratio of 93%. The strengthening contributions of Ti-V carbides were calculated to be 126MPa and 149MPa in the ferrite single-phase and F+B+M multi-phase microstructure, respectively.

Key words

orowan strengthening ultra-fast cooling high-strength hole-expanding ratio Ti-V carbide 


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  1. [1]
    WorldAutoSteel. FutureSteelVehicle Overview Report[EB/OL]. www.worldautosteel.orgGoogle Scholar
  2. [2]
    Mazinani M and Poole WJ. Effect of Martensite Plasticity on the Deformation Behavior of a Low–Carbon Dual–Phase Steel[J]. Metall. Mater. Trans. A, 2007, 38: 328–339CrossRefGoogle Scholar
  3. [3]
    Dykeman J, Hoydick D, Link T, et al. Material Property and Formability Characterization of Various Types of High Strength Dual Phase Steel[J]. SAE Tech. Paper, 2009, No.2009–01–0794Google Scholar
  4. [4]
    Seto K, Funakawa Y and Kaneko S. Hot Rolled High Strength Steels for Suspension and Chassis Parts “NANOHITEN” and “BHT Steel”[J]. JFE Tech. Rep., 2007, 10: 19–25Google Scholar
  5. [5]
    Caballero FG, Allain S, Cornide J, et al. Design of Cold Rolled and Continuous Annealed Carbide–free Bainitic Steels for Automotive Application [J]. Mater. Design, 2013, 49: 667–680CrossRefGoogle Scholar
  6. [6]
    Cai MH, Ding H, Lee YK, et al. Effects of Si on Microstructural Evolution and Mechanical Properties of Hot–rolled Ferrite and Bainite Dual–phase Steels[J]. ISIJ Int., 2011, 51: 476–481CrossRefGoogle Scholar
  7. [7]
    Choi SH, Kim EY and Kim SI. The Micromechanical Deformation Behaviors of Hot–rolled 590FB Steel during Hole–expansion Test[J]. Int. J. Plasticity, 2014, 58: 184–200CrossRefGoogle Scholar
  8. [8]
    Funakawa Y, Shiozaki T, Tomita K, et al. Development of High Strength Hot–rolled Sheet Steel Consisting of Ferrite and Nanometer–sized Carbides[J]. ISIJ Int., 2004, 44: 1 945–1 951CrossRefGoogle Scholar
  9. [9]
    Diaz–Fuentes M, Iza–Mendia A, Gutierrez I. Analysis of Different Acicular Ferrite Microstructures in Low–Carbon Steels by Electron Backscattered Diffraction Study of Their Toughness Behavior[J]. Metall. Mater. Trans. A, 2003, 34: 2 505–2 516CrossRefGoogle Scholar
  10. [10]
    Takahashi M, Kawano O, Hayashida T, et al. High Strength Hot–rolled Steel Sheets for Automobiles[J]. Nippon Steel Tech. Rep., 2003, 88: 8–12Google Scholar
  11. [11]
    Yen HW, Chen PY, Huang CY, et al. Interphase Precipitation of Nanometer–sized Carbides in a Titanium–Molybdenum–Bearing Low–carbon Steel[J]. Acta Mater., 2011, 59: 6 264–6 274CrossRefGoogle Scholar
  12. [12]
    Zurob HS, Hutchinson CR, Béché A, et al. A Transition from Local Equilibrium to Paraequilibrium Kinetics for Ferrite Growth in Fe–CMn: A Possible Role of Interfacial Segregation[J]. Acta Mater., 2008, 56: 2 203–2 211CrossRefGoogle Scholar
  13. [13]
    Campos SS, Morales EV and Kestenbach HJ. On Strengthening Mechanisms in Commercial Nb–Ti Hot Strip Steels[J]. Metall. Mater. Trans. A, 2001, 32: 1 245–1 248CrossRefGoogle Scholar
  14. [14]
    Yong QL. Secondary Phases in Steels[M]. Beijing: Metall. Industry Press, 2006, 44–47Google Scholar

Copyright information

© Wuhan University of Technology and Springer-Verlag GmbH Germany, part of Springer Nature 2018

Authors and Affiliations

  • Xinhua Pei (裴新华)
    • 1
    • 2
  • Zhenyu Liu
    • 1
  • Jiao Wei
    • 3
  • Xuefeng Liu
    • 1
  • Tao Jia (贾涛)
    • 1
    Email author
  • Hengfa Hu
    • 2
  1. 1.The State Key Lab of Rolling & AutomationNortheastern UniversityShenyangChina
  2. 2.Meishan Iron & Steel Co., LtdNanjingChina
  3. 3.BaoSteel Co., LtdShanghaiChina

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