발간논문

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Vol.38, No.9, 1249 ~ 1258, 2000
Title
Corrosion Characteristics and Mechanical Properties of New Zr-based Alloy
하승원Seung Won Ha,허주열Juh Youl Huh,김현길Hyun Gil Kim,정용환Yong Hwan Jeong
Abstract
The corrosion behavior and mechanical properties were investigated for new Zr-based alloys which were prepared by vacuum arc remelting and then received different thermo-mechanical treatments. Corrosion tests were carried out in a mini autoclave containing each of 360℃ water, 400℃ steam and 360℃ aqueous LiOH(70 ppm) solution. Microstructures of the tested alloys were analyzed using optical microscopy, SEM and TEM. All of the tested alloys showed higher corrosion rates in 400℃ steam than in 360℃ water or in the aqueous LiOH solution. As for the corrosion behavior in 400℃ steam, the alloy of low contents of Nb and Sn showed an enhanced corrosion resistance whereas the alloy with high Sn content exhibited a transition in corrosion rate as early as 80 days exposure. The yield strength, tensile strength and hardness decreased as the final annealing temperature increased in the range between 460 and 530℃. It was concluded from TEM study that mechanical properties and corrosion behavior would be related to the microstructure of the new Zr-based alloys.
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