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Acta Metall Sin  2011, Vol. 47 Issue (3): 269-274    DOI: 10.3724/SP.J.1037.2010.00476
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APT AND EXTRACTION REPLICA CHARACTERIZATION OF Cu–RICH CLUSTERS PRECIPITATED IN PRESSURE VESSEL MODEL STEELS
CHU Dafeng 1, XU Gang 1, WANG Wei 1, PENG Jianchao 2, WANG Jun’an 2,ZHOU Bangxin 1
1. Institute of Materials, Shanghai University, Shanghai 200072
2. The Key Laboratory for Advanced Micro–Analysis, Shanghai University, Shanghai 200444
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Abstract  The precipitation of Cu–rich clusters in reactor pressure vessel (RPV) model steel was investigated by means of atom probe tomography (APT), extraction replica (ER) and HRTEM. RPV model steel was prepared by vacuum induction furnace melting with higher content of Cu (0.6%, mass fraction). The ingot (about 50 kg of weight) was forged and hot–rolled to 4 mm in thickness and then cut to specimens of 40 mm×30 mm. Those specimens were further heat treated by 880 ℃/0.5 h water quenching and 660 ℃/10 h tempering, and finally aged at 370 ℃ for different time from 1000 to 6000 h. 4% nitric acid alcohol solution was used as an etchant to extract the precipitates of Cu–rich clusters from α–Fe matrix. The results obtained by APT analysis show that the number density of Cu–rich clusters reaches 3.1×1023 m−3 in the specimen aged at 370 ℃ for 4500 h, and the Cu content in the clusters increases rapidly during their growth from 1 nm to 5 nm. The segregation of Ni and Mn elements within and around the Cu–rich clusters was detected. The results obtained by ER, EDS and HRTEM analyses show that the majority of Cu–rich clusters are Cu–Fe (Ni, Mn) alloys with 10%—80% Cu (atomic fraction)but they are a single phaswith R or fcc crystal structure.
Key words:  rector pressure vessel model steel      Cu–rich cluster      atom probe tomography      extrction replica      high resolution transmission electron microscopy     
Received:  14 September 2010     
Fund: 

Supported by National Basic Research Program of China (No.2006CB605003) and National Natural Science Foundation of China (No.50931003)

Corresponding Authors:  ZHOU Bangxin     E-mail:  ahcdf2008@126.com

Cite this article: 

CHU Dafeng XU Gang WANG Wei PENG Jianchao WANG Jun’an ZHOU Bangxin. APT AND EXTRACTION REPLICA CHARACTERIZATION OF Cu–RICH CLUSTERS PRECIPITATED IN PRESSURE VESSEL MODEL STEELS. Acta Metall Sin, 2011, 47(3): 269-274.

URL: 

https://www.ams.org.cn/EN/10.3724/SP.J.1037.2010.00476     OR     https://www.ams.org.cn/EN/Y2011/V47/I3/269

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