Hot Ductility Behavior of 800MPa Ultra High Strength Niobium Containing Steels

Abstract:

The hot ductility behavior of 800MPa ultra high strength niobium containing steels has been investigated with Gleeble3500 hot simulator. Tensile test was carried out at 650°C1300°C at a constant true strain rate of 0.001 s¹. Experimental results showed that steel A has quite well ductility, and the brittle zone is narrow. Due to pro-eutectoid ferrite film formation along the prior austenite grain boundary at 650°C-750°C, samples showed a loss of hot ductility, and the fracture morphology of the specimens was brittle intercrystalline fracture, indicating the third brittle zone of the steel. However, the third brittle zone can be avoided during continuous casting, if the temperature of straightening could be kept over 800°C.

• Periodical: Advanced Materials Research (Volumes 690-693)
• Pages: 227-232
• DOI: https://doi.org/10.4028/www.scientific.net/AMR.690-693.227
• Online since: May 2013
• Authors: Qing Shan Li, Mei Zhang, Chao Bin Huang, Ru Yi Wu, Xue Zhao, Yong Zhong, Lin Li
• Keywords: 800MPa High Strength Steel, Brittle Zone, Continuous Casting Slab, Hot Ductility

References

[1] Young Mock Won, Kyung-hyun Kim and Tae-jung Yeo. Effect of cooling rate on ZST, LIT and ZDT of carbon steel near melting point [J]. ISIJ International, 1998, 38(10): 1093-1099.

DOI: 10.2355/isijinternational.38.1093

[2] Y. Ohmori and Y. Maehara. Precipitation of NbC and hot ductility of austenite stainless Steels [J].Transactions of Japan of Metals, 1984, 25(3): 160.

DOI: 10.2320/matertrans1960.25.160

[3] S.H. Song, A.M. Guo, D.D. Shen, Z.X. Yuan, J. Liu, T.D. Xu.Effect of boron on the hot ductility of 2.25Cr1Mo steel[J].Metal Mater Trans A, 2003,360 (1-2):96–100

[4] R.Abushosha, R.Vipond, B. Mintz, Mater. Influence of sulphur and niobium on hot ductility of as cast steels[J].Materials Science and Technology,1991,7(12) : 1101-1107.

DOI: 10.1179/mst.1991.7.12.1101

[5] H. Matsuoka, K. Osawa, M. Ono, M. Ohmura. Influence of Cu and Sn on hot ductility of steels with various C content[J].ISIJ Int. 1997, 37 (3):255-262.

DOI: 10.2355/isijinternational.37.255

[6] C. Nagasaki and J. Kihara, Effect of copper and tin on hot ductility of ultra-low and 0.2% carbon steels[J].ISIJ Int, 1997,37(5):523–530.

DOI: 10.2355/isijinternational.37.523

[7] B. Mintz, D.N. Crowther. Hot ductility of steels and its relationship to the problem of transverse cracking in continuous casting[J].Int. Mater. Rev. 2010,55 (3):168–196.

DOI: 10.1179/095066009x12572530170624

[8] K.C. Cho, D.J. Mun, Y.M. Koo, J.S. Lee. Effect of niobium and titanium addition on the hot ductility of boron containing steel Mater. Sci. Eng. A. 2011,528 (10-11): 3556–3561

DOI: 10.1016/j.msea.2011.01.097

[9] B. Mintz, S. Yue, and J.J. Jonas. Hot Ductility of Steels and Its Relationship to the Problem of Transverse Cracking During Continuous Casting[J].Int. Mater. Rev., 1991, 36(5):187-217

DOI: 10.1179/imr.1991.36.1.187

[10] B. Mintz, The influence of composition on the hot ductility of steels and to the problem of transverse cracking, ISIJ International, 39 (1999) 833-855.

DOI: 10.2355/isijinternational.39.833

[11] R. Abu-Shosha, R.R. Vippond, B. Mintz. Influence of sulphur and niobium on hot ductility of as cast steels[J] Materials Science and Technology, 1991,7(12):1101.

DOI: 10.1179/mst.1991.7.12.1101

[12] Z. Mohamed, Ph.D. Thesis, The City University, London, 1988.

[13] S. Shanmugam, N.K. Ramisetti, R.D.K. Misra, T. Mannering, D. Panda, S. Jansto. Effect of cooling rate on the microstructure and mechanical properties of Nb-microalloyed steels[J]Materials Science and Engineering A,2007.460-461: 335-343

DOI: 10.1016/j.msea.2007.01.054

[14] Nachtrab W.T., Chou Y.T. High temperature ductility loss in carbon-manganese and niobium-treated steels [J].Metallurgical Transactions A,(1986),17 (11) :1995-2006.

DOI: 10.1007/bf02644997

[15] Mao Xinping.Microallying Technology on Thin Slab Casting and Direct rolling Process[M].2008:305

[16] Z. Mohamed .Hot ductility behavior of vanadium containing steels[J]. Materials Science and Engineering A,2002, (326): 255–260

DOI: 10.1016/s0921-5093(01)01490-3

[17] D. N. Crowther, B.Mintz. Influence of grain size and precipitation on hot ductility of microalloyed steels[J]. Materials Science and Technology, 1986,2(11): 1099-1105.

DOI: 10.1179/mst.1986.2.11.1099

[18] Hirowo G. Suzuki, Satoshi Nishimura, et al. Characteristics of Embrittlement in Steels above 600°C [J]. TETSC-TO-HAGANE, 1979, 65(14): 2038-2043.

[19] Hirowo G. SUZUKI, Satoshi NISHIMURA, Jun IMAMURA, et al. Embrittlement of Steels Occurring in the Temperature Range from 1000 to 600°C [J]. Transactions ISIJ, 1984, 24:169-177.

DOI: 10.2355/isijinternational1966.24.169

[20] B. Minz, J. M. Arrowsmith. Hot-ductility behavior of C-Mn-Nb-Al steels and its relationship to crack propagation during the straightening of continuously cast strand [J]. Metals techno,1979, 6: 31.

DOI: 10.1179/030716979803276471