발간논문

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Vol.39, No.10, 1092 ~ 1101, 2001
Title
Transformations : The Correlation of Annealing Parameter and Microstructures on Corrosion Characteristics and Mechanical Properties of Zr - 1.0Nb Alloy
하승원Seung Weon Ha,허주열Joo Youl Huh,박정용Jeong Yong Park,정용환Yong Hwan Jeong
Abstract
The corrosion behavior and mechanical properties were investigated for Zr-1.0Nb alloys which were prepared by vacuum arc remelting and received different final heat-treatments. Corrosion tests were carried out in a static autoclave containing aqueous solution of 360℃ water and 360℃ LiOH (70 ppm). Microstructures of the tested alloys were analyzed using optical microscopy and TEM, and the cross-sectional surface of oxide layer was analyzed using SEM. All of the tested alloys showed higher corrosion rates in the 360℃ aqueous LiOH solution than in 360℃ water. As for the corrosion behavior in the 360℃ aqueous LiOH solution, the alloys exhibited a transition in corrosion rate as early as 30-45 days exposure. With respect to final annealing temperature, Zr-1.0Nb alloy having partialy recrystallized structure in this study showed higher corrosion resistance compared with the alloys having stress relieved, or fully recrystallized structure. It was concluded from TEM study that corrosion behavior would be related to the distribution and size of second phase particles. The yield strength, ultimate tensile strength and hardness decreased as the final annealing temperature increased.
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