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Vol.7 No.1previous AASP14 (87-88-89-90-91-92-93-94-95-96-97-
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Academic Articles
Regular Paper Vol.7 No.1 (2015) p.117 - p.121
 

Microstructural Evolution of Thermally Aged RPV Model Alloys by 3D Atom Probe

 
Li LIU1, Kenta MURAKAMI1, Kenji DOHI2, Kenji NISHIDA2, Akiyoshi NOMOTO2, Naoki SONEDA2, Zhengcao LI3, Naoto SEKIMURA1
 

1 The University of Tokyo, Department of Nuclear Engineering and Management, 7-3-1 Hongo Bunkyo-ku,Tokyo 113-8656, Japan
2 Central Research Institute of Electric Power Industry, 2-11-1 Iwado-kita, Komae, Tokyo 201-8511, Japan
3 Tsinghua University, Department of Materials Science and Engineering, Haidian , Beijing 100084, China

 
Abstract

The accurate understanding and prediction of neutron irradiation embrittlement of reactor pressure vessel (RPV) steels is a very important issue to ensure the safety and continued operation of nuclear power plant. High-density nano-scale Cu-rich precipitates, which are typically alloyed with Si, Ni or Mn, have been considered as the main contributor to the hardening embrittlement of RPV steels. In our work, four series of RPV model alloys, Fe-Cu, Fe-Cu-Si, Fe-Cu-Ni and Fe-Cu-Ni-Mn, are thermally aged at 450˚C for up to 380 hours. The effects of Si, Ni and Mn on hardening are discussed. Furthermore, Atom Probe Tomography (APT) was used to study Cu-rich precipitates.

 
Keywords
Atom Probe Tomography, RPV model alloys, thermal ageing, hardening, Cu-rich precipitates
 
Full Paper: PDF EJAM Vol.7No.1 pp.117-121 "Microstructural Evolution of Thermally Aged RPV Model Alloys by 3D Atom Probe"
Article Information
Article history:
Received 30 November 2014
Accepted 17 April 2015