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| Effect of Grain Orientation of Reactor Pressure Vessel Steel on Irradiation Hardening |
| Received:May 28, 2021 Revised:July 19, 2021 |
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| DOI：10.7643/issn.1672-9242.2022.01.003 |
| KeyWord:reactor pressure vessel steel irradiation hardening grain orientation |
| Author | Institution |
| LI Pei-yao |
Institute of Nuclear and New Energy Technology INET, Beijing , China |
| LYU Sha-sha |
College of Nuclear Science and Technology, Beijing Normal University, Beijing , China |
| WANG Hai-tao |
Institute of Nuclear and New Energy Technology INET, Beijing , China |
| CHEN Liang |
ParisTech Elite Institute of Technology, Shanghai Jiao Tong University, Shanghai , China |
| LI Zheng-cao |
School of Materials Science and EngineeringSMSE, Tsinghua University, Beijing , China |
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| Abstract: |
| This paper aims to investigate the relationship between grain orientation and irradiation hardening in reactor pressure vessel steels. Chinese A508-3 steel, which is currently widely used in reactor pressure vessels, is selected. 160 keV Fe-ion irradiation was performed on the pretreated RPV samples under room temperature. The irradiation damage was 0.2, 0.5, 1 and 10 dpa, respectively. Then the hardness was measured by nano-indentation technique on the marked areas of the samples before and after irradiation. The grain orientation analysis was performed by electron backscatter diffraction on the marked areas of the samples that had been tested for nanoindentation before and after irradiation. The results of nanoindentation results with different grain orientations were statistically analyzed, and the correlation between radiation hardening and grain orientation was found. The nanohardness exhibited the highest value and the grain orientation was near the [001] direction, and It gradually decreased when the grain orientation was away from the [001] direction. Therefore, when the rotation angle of the orientation [001] increased from 0° to 90°, the nanohardness gradually decreased. It is found that the hardness of Chinese RPV steel related to its grain orientation, and there could be a strong orientation dependence of irradiation-induced hardening in it, which provides a basis for reverse design of RPV. |
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