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Acta Metall Sin  2010, Vol. 46 Issue (12): 1488-1494    DOI: 10.3724/SP.J.1037.2010.00227
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STUDY ON PRECIPITATION BEHAVIOR OF PHASES CONTAINING Cu IN THE Cu–BEARING STEEL IN CONTINUOUS COOLING PROCESS
LI Chuang, WANG Xuemin, SHANG Chengjia, ZHENG Chang’an, HE Xinlai
School of Materials Science and Engineering, University of Science and Technology Beijing, Beijing 100083
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Abstract  The hardening behavior of five Cu–bearing steels during continuous cooling has been studied with the aid of thermo–simulation technique. Optical microscope (OM) and high resolution transmission electron microscopy (HRTEM) were employed to investigate the influence of cooling rate on the precipitation behavior in these steels and their hardness. The results show that during the continuous cooling the second phase precipitates occur in these steels and cause the precipitation hardening. These precipitates are proved to be Cu–rich phases and formed by the way of inter–phase precipitation. The precipitation behavior and hardening effect could be affected by cooling rate and copper content in these steels. When the steels are cooled at a cooling rate between 0.1—1 ℃/s, the second phase precipitates become finer and denser with the increase of cooling rate. Only when the cooling rate is 1 ℃/s the density of the second phase precipitates is the largest. When the cooling rate is quicker than 1 ℃/s, increasing the cooling rate leads to the precipitates being finer and fewer. When the samples are cooled at a rate of 10 ℃/s, there are few precipitates in samples. The Cu–rich phase is the main cause to strengthen these steels. It is also found that when the copper content is less than 1%, the precipitation behavior is unobvious.
Key words:  Cu–bearing steel      continuous cooling      inter–phase precipitation      Cu–rich phase     
Received:  11 May 2010     
ZTFLH: 

TG142.1

 
Fund: 

Supported by High Technology Research and Development Program of China (No.2008AA03Z501)

Corresponding Authors:  WANG Xuemin     E-mail:  talent32101@yahoo.com.cn

Cite this article: 

LI Chuang WANG Xuemin SHANG Chengjia ZHENG Chang’an HE Xinlai. STUDY ON PRECIPITATION BEHAVIOR OF PHASES CONTAINING Cu IN THE Cu–BEARING STEEL IN CONTINUOUS COOLING PROCESS. Acta Metall Sin, 2010, 46(12): 1488-1494.

URL: 

https://www.ams.org.cn/EN/10.3724/SP.J.1037.2010.00227     OR     https://www.ams.org.cn/EN/Y2010/V46/I12/1488

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