발간논문

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Vol.44, No.12, 823 ~ 831, 2006
Title
Effects of Heat-Treatment on the Tensile Strength and Corrosion Resistance of Extruded Zr-Nb Alloy
김태규 Tae Kyu Kim , 양성기 Sung Ki Yang , 최평식 Pyung Sik Choi , 이종탁 Chong Tak Lee , 손동성 Dong Seong Sohn
Abstract
The effects of heat-treatment on the tensile strength and corrosion resistance of extruded Zr-Nb alloy were evaluated. The Zr-Nb alloy was extruded at 700℃, and then heat-treated at 580℃ for up to 32 hours. The results of tensile tests at room temperature and 400℃ showed that the tensile strength was continuously reduced with increasing heat-treatment time, mainly due to the grain growth. The results of corrosion test in an ammonia aqueous solution of pH 10 at 360℃ for 100 days indicated that the heat-treatment led to enhance the corrosion resistance due to the decomposition of β-Zr phase to α-Zr + β-Nb phases. However, no more enhanced corrosion resistance was observed when the heat-treatment time more than 8 hours was applied. It is thus concluded that the longer heat-treatment time induce the lower tensile strength without enhancing the corrosion resistance.
Key Words
Zr-Nb alloy, tensile strength, corrosion resistance
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