Principle and Model of Phase Transformation in Ultra-High Strength Steel for Cone Crusher

Abstract:

The principle of phase transformation in ultra-high strength steel for cone crusher was studied by DIL805 thermal mechanical simulate, and the critical temperature was determined. The Austenite continuous cooling transformation (CCT) diagram of the steel was confirmed by thermal expansion curve, dilatometry and metallography. The phase transformation model was established and offered a theory for deciding parameters of heat treatment process. The results proved that: when the cooling rate was under 0.5 °C/s, the structure was mainly Pearlite and Bainite. With the increase of cooling rate, the content of lower Bainite increased. When it came to 1°C/s , Martensite start to transform from Austenite. When the cooling rate is 5°C/s, Pearlite disappears, Bainite and Martensite were in the majority. Meanwhile, the mathematical equations of phase transformation have high degree to fit the experimental results, and the phase transformation model is feasible.

• Periodical: Materials Science Forum (Volume 850)
• Pages: 636-641
• DOI: https://doi.org/10.4028/www.scientific.net/MSF.850.636
• Online since: March 2016
• Authors: Wei Wang*, Ren Bo Song, Shi Guang Peng, Ru Wen Zheng, Zhi Dong Tan, Ke Guo, Zhong Hong Wang
• Keywords: CCT Curve, Microstructure, Phase Transformation Model, Ultra-High Strength Steel

References

[1] Du Zhong-ze, Fu Han-guang, Feng Zhen-jun, et al. Effect of tempering treatment on wearing resistance of cast high speed steel rolls [J]. Transactions of Materials and Heat Treatment, 2011, 32(2): 93-99.

[2] Wen Hao-yu, Ma Yu, Wang Lian-bo, et al. Influence of heat treatment on microstructure and wear resistance of a medium-carbon-low-alloy wear-resistant steel [J]. Transactions of Materials and Heat Treatment, 2011, 32(12): 72-77.

[3] Liu Kai. The Research of the heat treatment of the low-alloy high strength steel [D]. Wuhan: Wuhan University of Science and Technology, (2009).

[4] Dong Tian-shun. Heat treatment and property of medium carbon Si-Mn multiphase wear-resistant steel [J]. Transactions of Materials and Heat Treatment, 2014, 07: 75-80.

[5] P. Yuntang Z, Chengjia S, Shangwu Y, et al. Metastable austenite transformation in low carbon microalloying steel [J]. Journal of University of Science and Technology Beijing, 2007(7): 694-698.

[6] Kwon O. A technology for the prediction and control of microstructural changes and mechanical properties in steel [J]. ISIJ, 1992, 32(3): 350-356.

DOI: 10.2355/isijinternational.32.350

[7] P.C.M. Rodrigues. Mechanical properities of an HSLA bainitic steel subjected to controlled rolling with accelerated cooling [J]. Materials Science and Engineering A, 283 (2000) 136–143.

DOI: 10.1016/s0921-5093(99)00795-9

[8] Manyun L, Benrong S. The technology of controlled rolling and controlled cooling process [G]. Metallurgical Industry Press, (1990).

[9] Zhang Shi-zhong. The steel atlas of super-cooling austenitic transition curve [M]. Beijing: Metallurgical Industry Press, 1993: 18−20.

[10] Fang Hong-sheng. Creation and Development of Novel Mn Series Air Cooled Bainitic Steels [J]. Heat Treatment, 2008, 03: 2-19.

[11] Liu Yang. Fe-C-Mn-B Alloy austenitic isothermal decomposition kinetics and redistribution of Mn [J]. Transactions of Materials and Heat Treatment, 1992, 01: 16-20.

[12] Xu Ping-guang. Current Status and Development of High Strength Low Alloy Steel Plate [J]. Materials for Mechanical Engineering, 2001, 02: 4-8+25.