Microstructure and Precipitation of a High Strength Microalloyed Steel

Abstract:

Microstructure and precipitation of a Ti-Nb microalloyed high-strength steel were studied. The objective of the study is to examine the factors affecting yield strength and the effect of processing temperatures on microstructure and precipitation. The research results indicate that the dominant factors responsible for yield strength are fine ferrite grains and fine-scale carbonitride precipitatates, which are affected by processing temperatures. The influence of reheating temperature on precipitates was analyzed. Moreover, the optimum reheating temperatures is suggested for Ti-Nb microalloyed high-strength steel.

• Periodical: Applied Mechanics and Materials (Volume 508)
• Pages: 12-15
• DOI: https://doi.org/10.4028/www.scientific.net/AMM.508.12
• Online since: January 2014
• Authors: Hai Lin Yang, Guang Xu*, Yi Zhang, Min Wang, Ming Xing Zhou
• Keywords: Grain Size, Precipitation, Ti-Nb Microalloyed Steel, Yield Strength

References

[1] H. Wu, C. Liu, Z. B. Zhao, Y. Zhao, S. Z. Zhu, Y. X. Liu, and S. J. Bhole: Design of air-cooled bainitic microalloyed steel for a heavy truck front axle beam, Mater. Des., 2006, 27(8), 651.

DOI: 10.1016/j.matdes.2004.12.014

[2] H. Niakan and A. Najafizadeh: Effect of niobium and rolling parameters on the mechanical properties and microstructure of dual phase steels, Mater. Sci. Eng. A., 2010, 527(21-22), 5410.

DOI: 10.1016/j.msea.2010.05.078

[3] G. Xu, X. L. Gan, G. J. Ma, F. Lou, and H. Zou: The development of Ti-alloyed high strength microalloy steel, Mater. Des., 2010, 31(6), 2891.

DOI: 10.1016/j.matdes.2009.12.032

[4] M. Z. Bai, D. Liu, Y. Z. Lou, X. P. Mao, L. J. Li, and X. D. Huo: Effects of Ti addition on low carbon hot strips produced by CSP process, J. Univ. Sci. Technol. B., 2006, 13(3), 230.

DOI: 10.1016/s1005-8850(06)60049-2

[5] S. Akhlaghi and S. Yue: Effect of Thermomechanical Processing on the Hot Ductility of a Nb-Ti Microalloyed Steel, ISIJ Int., 2001, 41(11), 1350.

DOI: 10.2355/isijinternational.41.1350

[6] K. M. Banks, A. Tuling, C. Klinkenberg, and B. Mintz: Influence of Ti on hot ductility of Nb containing HSLA steels, Mater. Sci. Technol., 2011, 27(2), 537.

DOI: 10.1179/026708309x12526620338278

[7] R. D. K. Misraa, H. Nathania, J.E. Hartmannc, and F. Siciliano: Microstructural evolution in a new 770 MPa hot rolled Nb–Ti microalloyed steel, Mater. Sci. Eng. A., 2005, 394(1-2), 339.

DOI: 10.1016/j.msea.2004.11.041

[8] J. Zrnı´k, T. Kvackaj, A. Pongpaybul, P. Sricharoenchai, J. Vilk, and V. Vrchovinsky: Effect of thermomechanical processing on the microstructure and mechanical properties of Nb–Ti microalloyed steel, Mater. Sci. Eng. A., 2001, 319-321, 321.

DOI: 10.1016/s0921-5093(01)01033-4