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임상엽 · 김성수* · 이경근
Zr-2.5%Nb 압력관 재료에서 수소 농도와 균질화 처리 온도에 따른 수소화물 석출 거동
Received: 26 December 2018;  Accepted: 8 February 2019.  Published online: 7 March 2019.
The precipitation characteristics of hydrides in Zr-2.5% Nb pressure tube material were investigated for various hydrogen concentrations and homogenization temperatures. A surface hydride was formed using the electrolytic method and homogenized at various temperatures up to at 550 oC. The homogenization treatment was carried out at 300-550 oC over 240 hours, and the hydrogen concentration in the Zr-2.5% Nb alloy varied from 28 to 144 ppm. Hydrides were observed by optical microscopy and the precipitation parameters of the hydrides were analyzed by MATLAB, quantitatively. This is the first achievement of quantitative analysis of hydrides in Zr-alloys. The length of hydrides increased linearly with hydrogen concentration when homogenized at or below 400 oC. The area fraction of hydrides increased linearly with the hydrogen concentration regardless of homogenization temperature. The length and the ratio (length/thickness) of the hydrides decreased with increasing homogenization temperature at 350-475 oC in 81-86 ppm hydrogen. The changes in the precipitation behavior of the hydrides with homogenization temperature are considered to be due to microstructure changes, both the decomposition of β-Zr and grain growth of α-Zr.
Keywords: Zr-2.5%Nb alloy, homogenization, hydrogen concentration, hydride, microstructure
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