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Metals 2017, 7(1), 25; doi:10.3390/met7010025

Effect of Heavy Ion Irradiation Dosage on the Hardness of SA508-IV Reactor Pressure Vessel Steel

1
School of Materials Science and Engineering, Beihang University, Beijing 100191, China
2
Department of Materials Science and Engineering, The University of Tennessee, Knoxville, TN 37996, USA
3
Beijing Key Laboratory of Advanced Nuclear Materials and Physics, Beihang University, Beijing 100191, China
4
Department of Nuclear Engineering, Texas A&M University, College Station, TX 77843, USA
*
Authors to whom correspondence should be addressed.
Academic Editor: Hugo F. Lopez
Received: 6 November 2016 / Revised: 21 December 2016 / Accepted: 10 January 2017 / Published: 14 January 2017
(This article belongs to the Special Issue Radiation Effects in Metals)
View Full-Text   |   Download PDF [3684 KB, uploaded 14 January 2017]   |  

Abstract

Specimens of the SA508-IV reactor pressure vessel (RPV) steel, containing 3.26 wt. % Ni and just 0.041 wt. % Cu, were irradiated at 290 °C to different displacement per atom (dpa) with 3.5 MeV Fe ions (Fe2+). Microstructure observation and nano-indentation hardness measurements were carried out. The Continuous Stiffness Measurement (CSM) of nano-indentation was used to obtain the indentation depth profile of nano-hardness. The curves showed a maximum nano-hardness and a plateau damage near the surface of the irradiated samples, attributed to different hardening mechanisms. The Nix-Gao model was employed to analyze the nano-indentation test results. It was found that the curves of nano-hardness versus the reciprocal of indentation depth are bilinear. The nano-hardness value corresponding to the inflection point of the bilinear curve may be used as a parameter to describe the ion irradiation effect. The obvious entanglement of the dislocations was observed in the 30 dpa sample. The maximum nano-hardness values show a good linear relationship with the square root of the dpa. View Full-Text
Keywords: SA508-IV; displacement per atom (dpa); ion irradiation hardening; inflection point; reactor pressure vessel (RPV) steel; nano-hardness SA508-IV; displacement per atom (dpa); ion irradiation hardening; inflection point; reactor pressure vessel (RPV) steel; nano-hardness
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

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MDPI and ACS Style

Bai, X.; Wu, S.; Liaw, P.K.; Shao, L.; Gigax, J. Effect of Heavy Ion Irradiation Dosage on the Hardness of SA508-IV Reactor Pressure Vessel Steel. Metals 2017, 7, 25.

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