| Title |
Effects of Heat-Treatment on the Tensile Strength and Corrosion Resistance of Extruded Zr-Nb Alloy |
| Authors |
김태규(Tae Kyu Kim); 양성기(Sung Ki Yang); 최평식(Pyung Sik Choi); 이종탁(Chong Tak Lee); 손동성(Dong Seong Sohn) |
| ISSN |
1738-8228(ISSN), 2288-8241(eISSN) |
| Keywords |
Zr-Nb alloy; tensile strength; corrosion resistance |
| 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. |