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Acta Metall Sin  2012, Vol. 48 Issue (4): 435-440    DOI: 10.3724/SP.J.1037.2011.00738
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EFFECT OF COOLING PATH ON THE HOLE-EXPANSION PROPERTY OF MEDIUM CARBON STEEL
WANG Bin, LIU Zhenyu, ZHOU Xiaoguang, WANG Guodong
State Key Laboratory of Rolling and Automation, Northeastern University, Shenyang 110819
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Abstract  In the present paper, ultra fast cooling (UFC) technology was applied in the cooling process to treat medium carbon steels after hot strip rolling, and the finish rolling temperature and UFC stop temperature are controlled as the important parameters. The effects of cooling path on the microstructure and hole-expansion property of annealing medium carbon steels were investigated. The results show that finely dispersed spherical cementite could be formed in ferrite matrix after annealing treatment. With decreasing the fininsh rolling temperature and UFC stop temperature, the spheroidized cementites after annealing were more homogeneous and dispersed finely. During hole-expansion test, cracks were observed to form usually in the edge region around the punched hole when the tangential elongation exceeded the forming limit, and cracks are mainly formed in the way of micro-voids coalescence. Fine and homogeneous microstructure comprised of ferrite and spheroidized cementite could improve the elongation of the experimental sheets, suppressing the coalescence of micro-voids, and improving the hole-expansion property.
Key words:  ultra fast cooling      medium carbon steel      spheroidized cementite      hole-expansion     
Received:  28 November 2011     
ZTFLH: 

TG355.5

 
Fund: 

;The Fundamental Research Funds for the Central Universities

Corresponding Authors:  zyliu@mail.neu.edu.cn      E-mail:  wangbin404@126.com

Cite this article: 

WANG Bin, LIU Zhenyu, ZHOU Xiaoguang, WANG Guodong. EFFECT OF COOLING PATH ON THE HOLE-EXPANSION PROPERTY OF MEDIUM CARBON STEEL. Acta Metall Sin, 2012, 48(4): 435-440.

URL: 

https://www.ams.org.cn/EN/10.3724/SP.J.1037.2011.00738     OR     https://www.ams.org.cn/EN/Y2012/V48/I4/435

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