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Vol.47, No.8, 474 ~ 482, 2009
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| Title |
| Effects of Final Heat Treatment on Corrosion and Mechanical Properties of Zr Alloy Strip Incorporating Nb |
| 이명호 Myung Ho Lee , 정양일 Yang Il Jung , 최병권 Byoung Kwon Choi , 박상윤 Sang Yoon Park , 김현길 Hyun Gil Kim , 박정용 Jeong Yong Park , 정용환 Yong Hwan Jeong |
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| Abstract |
| The effects of final heat treatment on the mechanical and corrosion properties of a Zr alloy strip incorporating Nb were investigated. The chemical composition of the strip was Zr-1.49Nb-0.38Sn-0.20Fe-0.11Cr, and strip specimens were subjected to final heat treatment in a temperature range of 580~700℃. Tensile tests at room temperature and 316℃, along with corrosion tests in a simulated PWR loop and a 70 ppm LiOH solution environment at 360℃, were performed on the specimens. The mechanical properties of the strip were saturated when the specimens received final heat treatment at an elevated temperature of more than 640℃. However, the corrosion resistance of the strip in the simulated PWR loop and in the 70 ppm LiOH solution environment was improved with a decrease of the final annealing temperature. It is recommended that the alloy strip be finally heat-treated at a temperature of less than 620℃ for longer than 10 minutes in order to obtain fully recrystallized microstructures, and thereby attain enlarged tensile elongation, and to prevent the precipitation of β-Zr, which is known to deteriorate the corrosion resistance. |
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| Key Words |
| Zirconium alloy, mechanical properties, corrosion, final annealing |
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