• 제목/요약/키워드: Zircaloy-4

검색결과 214건 처리시간 0.035초

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

  • Lee, Key-Soon;Lee, Byong-Whi
    • Nuclear Engineering and Technology
    • /
    • 제21권4호
    • /
    • pp.341-345
    • /
    • 1989

  • Zircaloy-4 피복관의 조사손상에 영향을 줄 수 있는 부레이징 계면의 베릴륨 분포거동을 EPMA의 X-선 선분석으로 조사하여 다음과 같은 결과를 얻었다. 1) 부레이징에 의해 생성된 합금상의 베릴륨 함유량은 ~6.3mass%이었다. 2) 베릴륨의 기지금속(피복관 및 베어링 패드)내 확산은 부레이징 계면으로부터 ~5$\mu$m범위 외에서는 무시될 수 있었다.

  • PDF

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

  • 고진현;김상호;박춘호;김수성
    • Journal of Welding and Joining
    • /
    • 제20권3호
    • /
    • pp.98-104
    • /
    • 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.

  • PDF KSCI