A Study on Grade 1000MPa High Performance Steel Plate Processing by Direct Quenching

Abstract:

A 1000MPa grade steel plate for coal mining machinery equipment was studied in this paper. The ultra-high strength steel plate is processed by direct quenching after hot rolling plus tempering (DQ-T) to obtain high toughness and ductility. It has found that the tempering temperature has an important influence on the steel microstructure, precipitation behavior and the plate mechanical properties. At the lower tempering temperatures from 400 °C to 450 °C, the steel plate has a low toughness. When the tempering temperature is higher than 450 °C, the higher mechanical properties can be obtained due to the carbides precipitation, dislocation dissolution and carbide decomposition from residual austenite after quenching. The steel microstructure is comprised of tempered sorbite and bainite, in which sorbite plays an important role in obtaining premium microstructure.

• Periodical: Materials Science Forum (Volumes 773-774)
• Pages: 312-318
• DOI: https://doi.org/10.4028/www.scientific.net/MSF.773-774.312
• Online since: November 2013
• Authors: Shu E Hu*, Wei Hua Sun, Xiao Dong Liu, Feng Qiang Xiao, Deng Yi Hou, Dong Hua Hou, Guo Dong Wang
• Keywords: Direct Quenching, Dislocation, High Performance Steel, Precipitation, Steel Plate, Tempering

References

[1] William Roberts. New Development of Microalloying Elements Design and Processing. American Codiety for Metals. 1983. 10: 35

[2] A. J. DeArdo. Grain Refinement of V-Ti-N Microalloying Steels through Recrystalization and Contral Cooling. The University of Pittsburgh. 1983. 10: 86

[3] Tony Nilsson. Plastic High Strength Steel. Svenskt Stalaktiebolag Domnarvet. American Codiety for Metals. 1983. 10: 256

[4] Wang J Z, Kang Y L, Yang S W, et al. Effect of Tempering Temperature on the Structure and Properties of a Ultra-low Carbon Bainite Steel (ULCB) . Heat TreatMet, 2007, 32 (11) : 19

[5] Lan H F, Du L X, Liu Y C, et al. Effect of Finish Cooling Temperature on Properties of High Strength Engineering Machinery Steel. Mater Mech Eng, 2008, 32 (9) : 29

[6] Yao L D, Zhao S X, Zhao X T, et al. 800MPa Grade Heavy Plates with Low Susceptibility to Welding Cack Produced by Direct Quenching. Trans Mater Heat Treat, 2009, 30 (3) : 132

[7] CHENG Juqiang, LIU Zhixue, XU Zhenhua, KANG Mokuang. Microstructure and Properties of 1250 MPa Grade New Type Bainite Wear-resistant Steel Plate as Hot Rolled and Low Tempered[J]. Materials for Mechanical Engineering, Vol. 29(2005): 29-31

[8] FENG Yaorong, GAO Huilin, HUO Chunyong. Analysis and Identification on Microstructure of Pipeline Steels[M]. Beijing: Metallurgical Industry Press, 1991. P121.

[9] WANG Xue-min. Aging Behavior of Low Carbon Bainitic Steels with Cu［D］. Beijing: University of Science and Technology Beijing, 2000: 21.

[10] ZHOU Zi-nian. The Hereditary Phenomenon of Structure in Steels[J]. Heat Treatment of Metals, 1982, (1): 37-45.