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Nb 첨가 Zr 합금의 열처리 조건에 따른 LiOH 용액에서의 부식특성 연구
김현길,정용환,김도훈 대한금속재료학회(대한금속학회) 2000 대한금속·재료학회지 Vol.38 No.5
In order to develop the new zirconium alloys for cladding materials, the effects of Nb addition and the final heat treatment on the microstructure and corrosion characteristics of Zr-xNb(x = 0.2, 1.0 wt.%) alloys were investigated. The 1.0Nb alloy showed higher corrosion resistance than 0.2Nb alloy at 360℃, 70 ppm LiOH solution. The microstructure of oxide films that having equal oxide thickness has been characterized by TEM. The oxide of 1.0Nb alloy was mainly composed of columnar grains but the oxide of 0.2Nb alloys was mainly composed of equiaxed grains. From the XRD analysis of equal oxide thickness, the oxide of 1.0Nb alloy has higher tetra-ZrO₂ volume fraction than 0.2Nb alloys. Also when hydrogen pick-up content and fraction were measured with the corroded specimens of 0.2, 1.0Nb alloy at pre and post transition region, the hydrogen pick-up content and fraction were lower in 1.0Nb than 0.2Nb alloy. From the final heat treatment effect, the 1.0Nb alloy was affected annealing temperature but the 0.2Nb alloy was not.
지르코늄합금의 Nb/Fe 첨가비율에 따른 미세조직 및 부식거동
김현길,정용환 대한금속재료학회 2004 대한금속·재료학회지 Vol.42 No.9
The effect of Nb and Fe addition ratio on the microstructure, corrosion behavior of Zr-based alloys has been performed. The Nb/Fe ratio was controlled to be 0.6 to 7.0 maintaining the same Nb + Fe content in each alloy. The microstructural analysis on the grain size and the precipitate properity such as area fraction, mean diameter and crystal structure was used for interpreting the corrosion kinetics. The grain size and the precipitate area fraction were not largely affected by the Nb/Fe ratio, but the precipitate mean diameter and the precipitate crystal structure were changed with those of ratios. The corrosion resistance of ternary Zr-Nb-Fe alloys was improved when the Nb/ Fe ratio that controlled the precipitate crystal structure was lower than 1.0. Therefore, it seems that the corrosion behavior was largely affected by the crystal structure of precipitate among the various microstructural characteristics.