• Title/Summary/Keyword: Zircaloy

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The Effect of Final Heat Treatment and Welding on Irradiation Growth of Zircaloy-4 (최종열처리와 용접Zircaloy-4의 방사선조사 성장에 미치는 영향)

  • Im, Gap-Sun;Han, Jeong-Ho;Jeong, Yong-Hwan;Lee, Deok-Hyeon;Park, Gi-Seong;Kim, Yeong-Seok;Kim, Seon-Jin
    • Korean Journal of Materials Research
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    • v.3 no.1
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    • pp.65-71
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    • 1993

  • Abstract The effect of final heat treatment and welding on the irradiation growth of Zircaloy-4 was investigated. As a simulation for neurtron irradiation, accelerated proton beam with the energy of 3.5MeV was used up to the proton fluence of 9.8 ${\times}{10^{21}}$p/$m^2$ in the present study. It was found that irradiation growth of the annealed specimen was the highest and that of the ${\beta}$-quenched specimen was the samllest among the present specimens. The magnitude of irradiation growth of the present specimens decreased by welding. The difference in the magnitude of irradiation growth of the present specimens with different final heat treatment and the effect of welding on it were quantitatively analyzed in terms of crystallographic texture by using Kearns number, f, which was calculated from the x-ray diffraction data.

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Investigation of NH4OH on Zircaloy-4 Surfaces Using Electron Emission Spectroscopy

  • Jung, Hye-Yoon;Kang, Yong-Cheol
    • Bulletin of the Korean Chemical Society
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    • v.28 no.10
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    • pp.1751-1755
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    • 2007

  • The interaction of ammonium hydroxide (NH4OH) with zircaloy-4 (Zry-4) was investigated using X-ray photoelectron spectroscopy (XPS) and Auger electron spectroscopy (AES) methods. In order to study the surface chemistry of NH4OH/Zry-4 system, the binding energies of N1s, O1s and Zr3d electrons were monitored. The N1s peak intensity was remarkably increased by following cycles of Ar+ sputtering of NH4OH dosed Zry-4 surface at room temperature. Because the nitrogen stayed under the subsurface region was diffused out onto the Zry-4 surface after oxygen concentration was decreased. These could be occurred after the surface oxygen was diffused into the bulk or desorbed out from the surface until Ar+ fluence was 6.0 × 1016 Ar+/cm2 then the surface was relatively atomic deficient state. The O1s peak intensity was decreased by stepwise Ar+ sputtering. After many cycles of Ar+ sputtering, the peak intensities of Zr3d peaks did not change much but the shape of the peak clearly did change. This implies that the oxidation state of zirconium was changed during stepwise Ar+ sputtering of NH4OH/Zry-4. The Zr3d peak intensity of zirconium nitride (ZrNx) increased as the intensity of N1s (from zirconium nitride) increased but the Zr3d peak intensity of zirconium oxide (ZrOx) decreased due to the depopulation of the oxygen species on the surface region. We also observed that the peak intensity of Zr4+ was nearly same after Ar+ sputtering processes but the peak intensity of metallic zirconium increased compared to that of before the sputtering process was performed.

  • https://doi.org/10.5012/bkcs.2007.28.10.1751 인용 PDF KSCI

Brazing Characteristics of Zircaloy-4 Using Rapidly Solidified Amorphous Zr-Be Alloy Filler Metals (급속응고된 비정질 Zr-Be 합금 용가재를 이용한 Zircaloy-4의 브레이징 특성)

  • Kim, Sang-Ho;Go, Jin-Hyeon;Park, Chun-Ho;Kim, Seong-Gyu
    • Korean Journal of Materials Research
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    • v.12 no.2
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    • pp.140-145
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    • 2002

  • This study was conducted to investigate the brazing characteristics between Zircaloy-4 nuclear fuel cladding tubes and bearing pads with filler metals of amorphous $Zr_{1-x}Be_x$(0.3$\leq$x$\leq$0.5) binary alloy, in which they were produced in the ribbon form by the melt-spinning metod. The crystallization behavior, stability, hardness and micro-structure of brazed zone were examined by X-ray diffraction, differential scanning calorimetry, micro-Vickers hardness test, optical microscopy, and transmission electron microscopy. $Zr_{1-x}Be_x$(0.3$\leq$x$\leq$0.4) amorphous alloys were crystallized to $\alpha$-Zr with increasing the temperature, and the rest were transformed to ZrBe$_2$at higher temperatures. On the other hand, $Zr_{1-x}Be_x$(0.4$\leq$x$\leq$0.5) amorphous alloys were crystallized to $\alpha$-Zr and ZrBe$_2$, simultaneously. The thickness of the layer brazed with amorphous alloy was increased with increasing the beryllium content due to the higher diffusion of Be. The morphology of brazed layer with PVD Be filler metal showed dendrite while that brazed with amorphous alloys appeared globular. Micro-Vickers hardness of brazed zone increased as the beryllium content of filler metal was decreased.

  • https://doi.org/10.3740/MRSK.2002.12.2.140 인용 PDF KSCI