Effect of Mo on Transformation, Microstructure and Property of Hot-Rolled DP600 Steel

Abstract:

In according with the transformation rules of C-Si-Mn-Cr and C-Si-Mn-Cr-Mo tested steels, rolling experiment was carried out in lab. to analyze the effect of Mo on transformation, microstructure and property of high strength hot rolled dual phase steels. The results showed that the addition of element Mo decreased start temperature of ferrite transformation and restrains pearlite transformation. There was a metastable austenite zone between ferrite and bainite transformation zone of No.2 steel with 0.35% of Mo. After controlled rolling and step cooling process, dual phase microstructures in which fine martensite islands dispersed in soft ferrite matrix were obtained by two kinds of tested steel. With the addition of Mo, yield strength and tensile strength increased by 80MPa and 60MPa respectively, meanwhile, elongation increased slightly.

• Periodical: Materials Science Forum (Volume 817)
• Pages: 560-564
• DOI: https://doi.org/10.4028/www.scientific.net/MSF.817.560
• Online since: April 2015
• Authors: Le Yu Zhou*, Tian Hao Cui, Bo Jiang, Chao Lei Zhang, Jian Zhong He, Ya Zheng Liu
• Keywords: Hot-Rolled Dp Steel, Mechanical Property, Microstructure, Mo, Transformation

References

[1] M.T. Ma, M. F. Shi. Advanced High Strength Steel and It's Applications in Automobile Industry [J]. Iron and steel, 39(2004): 68-72 (in Chinese).

[2] D. Tang, Z. L Mi, Y.L. Cheng, et al. Technology and Research and Development of Advanced Automobile Steel Abroad [J], 40(2005): 1-5 (in Chinese).

[4] De M. Cosmo, L. M. Galantucci. L. Tricarico. Design of process parameters for dual phase steel production with strip rolling using the finite-element method [J], Journal of Materials Processing Technology, 92-93(1999): 486-493.

DOI: 10.1016/s0924-0136(99)00241-1

[5] X.H. Xue, Y.Y. Shan, L. Zheng, et al. Microstructural characteristic of low carbon microalloyed steels produced by thermo-mechanical controlled process [J]. Materials Science and Engineering A, 438–440 (2006): 285-287.

DOI: 10.1016/j.msea.2006.02.064

[6] A. Bakkaloglu. Effect of processing parameters on the microstructure and properties of an Nb microalloyed steel [J]. Materials Letters, 56 (2002): 200-209.

DOI: 10.1016/s0167-577x(02)00440-8

[7] R. P. Garrett, S. Xub, J. Lin, et al. A model for predicting austenite to bainite phase transformation in producing dual phase steels [J]. International Journal of Machine Tools & Manufacture, 44 (2004): 831-837.

DOI: 10.1016/j.ijmachtools.2004.01.004

[8] M. Erdogan. Effect of austenite dispersion on phase transformation in dual phase steel [J]. Scripta Materialia, 48(2003): 501-506.

DOI: 10.1016/s1359-6462(02)00500-6

[9] R.B. Song, Q.F. Dai. Dynamic Deformation Behavior of Dual Phase Ferritic-Martensitic Steel at Strain Rates From 10−4 to 2000 s−1. Journal of Iron and Steel Research, International, 20(2013): 48-53.

DOI: 10.1016/s1006-706x(13)60140-5

[10] W. Tan, B. Han, S.Z. Wang, et al. Effects of TMCP parameters on microstructure and mechanical properties of hot rolled economical dual phase steel in CSP. Journal of Iron and Steel Research International, 19 (2012): 37-41.

DOI: 10.1016/s1006-706x(12)60124-1