| HUANG Jun-bo,HE Yi,YIN Fu-xing.Improvement of Electro-polishing on the Welding Nickel-based Alloy Surface of AP1000 CRDM Nozzle[J],42(5):70-73 |
| Improvement of Electro-polishing on the Welding Nickel-based Alloy Surface of AP1000 CRDM Nozzle |
| Received:May 08, 2013 Revised:May 23, 2013 |
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| DOI： |
| KeyWord:welding nickel alloy electro-polishing surface roughness surface stress |
| Author | Institution |
| HUANG Jun-bo |
Materials Research Institute for Energy Equipments, China First Heavy Industries, Tianjin , China |
| HE Yi |
Materials Research Institute for Energy Equipments, China First Heavy Industries, Tianjin , China |
| YIN Fu-xing |
Materials Research Institute for Energy Equipments, China First Heavy Industries, Tianjin , China |
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| Abstract: |
| Electro-polishing process for the welding nickel-based alloy of AP1000 upper head CRDM nozzle was studied. The improvement on the surface roughness and residual surface stress were investigated. The results show that the current density should be controlled in the range of 0 . 3 ~ 0 . 5 A / cm2and the polishing time should be within 2 ~ 5 min. The residual stress tests in surface demonstrate that tensile stress is remarkably decreased, and even pressing stress is induced by the electropolishing process, which may restrain the occurrence of stress-corrosion cracking in the welding nickel-based alloy. |
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