• Title/Summary/Keyword: zircaloy-4

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Beryllium Analysis on the Brazing Zone of Zircaloy-4 Cladding (Zircaloy-4 피복관 부레이징 계면의 베릴륨 분석)

  • Lee, Key-Soon;Lee, Byong-Whi
    • Nuclear Engineering and Technology
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    • v.21 no.4
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    • pp.341-345
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    • 1989

  • The distribution behaviors of beryllium which may produce a deleterious damage in the zircaloy cladding have been investigated by the X-ray line scanning of EPMA. The results obtained are as follows; 1) The alloy phase formed by the brazing contains ~6.3 mass % of beryllium. 2) The beryllium diffusion in the base metal (cladding and bearing pad) is recognized only in the range ~5 $\mu$m from the brazing interface.

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Microstructural Characteristics of Zircaloy-4 Nuclear Fuel Cladding Welds by Resistance Upset Welding Processes (저항 업셋 용접방식에 따른 Zircaloy-4 핵연료 피복재 용접부의 미세조직 특성)

  • 고진현;김상호;박춘호;김수성
    • Journal of Welding and Joining
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    • v.20 no.3
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    • pp.98-104
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    • 2002

  • A study on microstructures of welds for Zircaloy-4 sheath end closure by the resistance upset welding methods was carried out. Two upset welding process variations such as magnetic farce and multi-impulse resistance welding were used. Grain size and microhardness across welds were analysed in terms of welding parameters. Magnetic farce resistance weld with one cycle of unbalanced mode has smaller upset length and $\alpha-grain$ size in heat affected zone than those of multi-impulse resistance weld because of lower heat input and shorter welding time. Heat affected zone formed by two upset resistance welding variations revealed fine Widmanstatten structure or martensitic ${\alpha}'$ structure due to the high heating rate and foster cooling rate. Magnetic force resistance welds showed recrystallized grains before grain growth, whereas multi-impulse resistance welds showed full grain growth.

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