冷却模式对铸坯表面组织的影响

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Abstract The samples of diameter 10 mm were made to simulate slab surface. The experiment was made to control the samples cooling at traditional cooling pattern and controlled cooling pattern respectively. Furthermore, the microstructure of transverse section was observed under a metallographic microscope to study the influence on microstructure of slab surface of cooling pattern. The experiment results are as follows: Using traditional cooling pattern, the microstructure is massive ferrite and pearlite by the side of the sample. The grain sizes are between 10-200μm. Moreover the microstructure is strip ferrite, acicular ferrite and pearlite at the center area, the grain sizes are bigger, and the microstructure is uneven. Under controlled cooling conditions, the microstructure is massive ferrite and pearlite. The grain sizes are between 9.36-12.25μm and that the grains are small and the microstructure is even. The controlled cooling pattern can promote refinement grains to increase the hot ductility of slab surface, which will have positive effect on avoiding the occurrence of surface transverse cracks.

Key words： slab surface structure cooling pattern metallographic analysis surface transvers cracks

Received: 04 July 2012 Published: 18 April 2013

PACS:

TF777.1

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	Articles by authors
	YU Hai-Bao
	ZHANG Jiong-Meng
	DIAO Xin-Yu
	LIU Xiang
	YU Wen-Jun
	ZHEN Xin-Gang

Cite this article:

YU Hai-Bao,ZHANG Jiong-Meng,DIAO Xin-Yu等. Effect of Cooling Pattern on Surface Microstructure of Slab[J]. Iron and Steel, 2013, 48(4): 35-39.

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http://www.chinamet.cn/Jweb_gt/EN/ OR http://www.chinamet.cn/Jweb_gt/EN/Y2013/V48/I4/35

[1]	Cai kaike. Controlling crack on surface of continuous casting slab. Angang technology. 2004, 3: 1.
[1]	Cai kaike. Controlling crack on surface of continuous casting slab. Angang technology. 2004, 3: 1.
[2]	Harada S, Tanaka S, Misumi H, et al. A formation mechanism of transverse cracks on CC slab surface. ISIJ Int. 1990, 30(4): 310.
[3]	郭金山，马凤川．连铸板坯表面裂纹形成原因及控制措施．天津冶金．2009，2:17.
[2]	Harada S, Tanaka S, Misumi H, et al. A formation mechanism of transverse cracks on CC slab surface. ISIJ Int. 1990, 30(4): 310.
[3]	郭金山，马凤川．连铸板坯表面裂纹形成原因及控制措施．天津冶金．2009，2:17.
[4]	Niu S T, Zhang X Z, Gan Y. Formation mechanism and countering measures for transvers surface crack of continuous casting slabs. Special steel. 2011, 1(2): 19.
[4]	Niu S T, Zhang X Z, Gan Y. Formation mechanism and countering measures for transvers surface crack of continuous casting slabs. Special steel. 2011, 1(2): 19.
[5]	Zhu G S, Wang X H, Li W et al. Study of transverse surface crack of continuously cast slab. The twelfth national steelmaking academic congress, Shanghai, 2002: 6.
[5]	Zhu G S, Wang X H, Li W et al. Study of transverse surface crack of continuously cast slab. The twelfth national steelmaking academic congress, Shanghai, 2002: 6.
[6]	Xing Wei, Luo Bin, Ma Chunwu, et al. Study on secondary cooling and quality of continuous cast billet. Foundry Technology. 2012, 33(1): 66.
[6]	Xing Wei, Luo Bin, Ma Chunwu, et al. Study on secondary cooling and quality of continuous cast billet. Foundry Technology. 2012, 33(1): 66.
[7]	Takeuchi E, Brimacombe J E. Effect of oscillation-mark formation on the surface quality of continuously cast steel slabs. Metallurgical Transaction B, 1985, 16B: 605.
[7]	Takeuchi E, Brimacombe J E. Effect of oscillation-mark formation on the surface quality of continuously cast steel slabs. Metallurgical Transaction B, 1985, 16B: 605.
[8]	Ma Fanjun, Wen Guanghua, Tang Ping, et al. Effect of cooling rate on the slab surface microstructure of microalloyed steel containing Nb and Ti. Journal of university of science and technology beijing. 2009, 31(9): 1116-1121.
[8]	Ma Fanjun, Wen Guanghua, Tang Ping, et al. Effect of cooling rate on the slab surface microstructure of microalloyed steel containing Nb and Ti. Journal of university of science and technology beijing. 2009, 31(9): 1116-1121.
[9]	Li Y F, Wen G H, Tang P et al. Effect of cooling patterns on the slab surface microstructure of microalloyed steel. Conference Proceedings of the 8th iron and steel annual congress. Beijing, 2011: 10.
[9]	Li Y F, Wen G H, Tang P et al. Effect of cooling patterns on the slab surface microstructure of microalloyed steel. Conference Proceedings of the 8th iron and steel annual congress. Beijing, 2011: 10.
[10]	Suziki H G. Nishimura S, Imamura J et al. Hot ductility in steels in the temperature range between 900 and 600℃. Tetsu-to-hagane, 1981, 8(6): 1180.
[10]	Suziki H G. Nishimura S, Imamura J et al. Hot ductility in steels in the temperature range between 900 and 600℃. Tetsu-to-hagane, 1981, 8(6): 1180.
[11]	Kato T, Ito Y, Kawamoto M, et al. Prevention of slab surface transverse cracking by microstructure control. ISIJ International, 2003, 43(11): 1742-1750.
[11]	Kato T, Ito Y, Kawamoto M, et al. Prevention of slab surface transverse cracking by microstructure control. ISIJ International, 2003, 43(11): 1742-1750.
[12]	Elwazri, A M, Hassani F, Yue S, et al. The effect of thermal history on the hot ductility of microalloyed steels. ISIJ Int, 1999, 39(3): 253.
[12]	Elwazri, A M, Hassani F, Yue S, et al. The effect of thermal history on the hot ductility of microalloyed steels. ISIJ Int, 1999, 39(3): 253.
[13]	Zarandi F, Yue S. Improvement of hot ductility in the Nb-microalloyed steel by high temperature deformation. ISIJ Int, 2005, 45(5): 686.
[13]	Zarandi F, Yue S. Improvement of hot ductility in the Nb-microalloyed steel by high temperature deformation. ISIJ Int, 2005, 45(5): 686.
[14]	Lee U H, Park T E, Son K S. Assessment of hot ductility with various thermal histories as an alternative method of in situ solidification. ISIJ Int, 2010, 50(4): 540.
[14]	Lee U H, Park T E, Son K S. Assessment of hot ductility with various thermal histories as an alternative method of in situ solidification. ISIJ Int, 2010, 50(4): 540.