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http://dx.doi.org/10.1016/j.net.2017.12.001

Effect of a surface oxide-dispersion-strengthened layer on mechanical strength of zircaloy-4 tubes  

Jung, Yang-Il (Nuclear Fuel Safety Research Division, Korea Atomic Energy Research Institute)
Park, Dong-Jun (Nuclear Fuel Safety Research Division, Korea Atomic Energy Research Institute)
Park, Jung-Hwan (Nuclear Fuel Safety Research Division, Korea Atomic Energy Research Institute)
Kim, Hyun-Gil (Nuclear Fuel Safety Research Division, Korea Atomic Energy Research Institute)
Yang, Jae-Ho (Nuclear Fuel Safety Research Division, Korea Atomic Energy Research Institute)
Koo, Yang-Hyun (Nuclear Fuel Safety Research Division, Korea Atomic Energy Research Institute)
Publication Information
Nuclear Engineering and Technology / v.50, no.2, 2018 , pp. 218-222 More about this Journal
Abstract
An oxide-dispersion-strengthened (ODS) layer was formed on Zircaloy-4 tubes by a laser beam scanning process to increase mechanical strength. Laser beam was used to scan the yttrium oxide ($Y_2O_3$)-coated Zircaloy-4 tube to induce the penetration of $Y_2O_3$ particles into Zircaloy-4. Laser surface treatment resulted in the formation of an ODS layer as well as microstructural phase transformation at the surface of the tube. The mechanical strength of Zircaloy-4 increased with the formation of the ODS layer. The ring-tensile strength of Zircaloy-4 increased from 790 to 870 MPa at room temperature, from 500 to 575 MPa at $380^{\circ}C$, and from 385 to 470 MPa at $500^{\circ}C$. Strengthening became more effective as the test temperature increased. It was noted that brittle fracture occurred at room temperature, which was not observed at elevated temperatures. Resistance to dynamic high-temperature bursting improved. The burst temperature increased from 760 to $830^{\circ}C$ at a heating rate of $5^{\circ}C/s$ and internal pressure of 8.3 MPa. The burst opening was also smaller than those in fresh Zircaloy-4 tubes. This method is expected to enhance the safety of Zr fuel cladding tubes owing to the improvement of their mechanical properties.
Keywords
Laser Surface Treatment; Microstructure; Oxide Dispersion Strengthened Alloy; Tensile Strength; Zirconium Alloy;
Citations & Related Records
Times Cited By KSCI : 3  (Citation Analysis)
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