| Title |
Corrosion Characteristics with Heat - treatment of Zircaloy - 4 Alloy |
| Authors |
김준환(Jun Hwan Kim); 위명용(Myeong Yong Wey); 정용환(Yong Hwan Jeong) |
| Abstract |
The corrosion and microstructural characteristics with heat treatment of Zircaloy-4 alloy were investigated for the specimens heated in the temperature range of α, α+β and β. The microstructures of specimens heated in the α, α+β and β range showed the equiaxed α, the mixed type of equiaxed and widmansta¨tten structure, and widmanstatten structrue, respectively. As the annealing temperature increased, the volume fraction and size of precipitates decreased. Mini autoclave tests were carried out at steam temperature of 500℃ and steam pressure of 1500psi to investigate the effect of annealing temperature and annealing time on the corrosion resistance of Zircaloy-4 alloy. It was observed that the corrosion resistance of β-heat treated specimen was higher than that of α-heat treated specimen. From combining the present results with other works, it is suggested that the nodular corrosion occur in the local region where alloying elements are depleted. |