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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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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.
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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.
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Received: 11 May 2010
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Fund: Supported by High Technology Research and Development Program of China (No.2008AA03Z501) |
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