열처리공학회지 (Journal of the Korean Society for Heat Treatment)

  • 제17권5호
  • /
  • Pages.271-277
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  • 2004
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  • 1225-1070(pISSN)
  • /
  • 2508-4046(eISSN)
한국열처리공학회 (The Korean Society for Heat Treatment)
권호 표지

${\beta}$-열처리시 Nb 첨가량과 냉각속도가 Zr 합금의 상변태에 미치는 영향

Effect of Nb-content and Cooling Rate during ${\beta}$-quenching on Phase Transformation of Zr Alloys

  • 최병권 (한국원자력연구소, 지르코늄신합금 핵연료피복관 개발팀) ;
  • 김현길 (한국원자력연구소, 지르코늄신합금 핵연료피복관 개발팀) ;
  • 정용환 (한국원자력연구소, 지르코늄신합금 핵연료피복관 개발팀)
  • Choi, B.K. (Zirconium Fuel Cladding Team, Korea Atomic Energy Research Institute) ;
  • Kim, H.G. (Zirconium Fuel Cladding Team, Korea Atomic Energy Research Institute) ;
  • Jeong, Y.H. (Zirconium Fuel Cladding Team, Korea Atomic Energy Research Institute)
  • 투고 : 2004.03.10
  • 심사 : 2004.07.19
  • 발행 : 2004.09.30
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초록

Zr-xNb alloys (x = 0.2, 0.8, 1.5 wt.%) were prepared to study the characteristics of the phase transformation in Zr-Nb system. The samples were heat treated at ${\beta}$-temperature ($1020^{\circ}C$) for 20 min and then cooled with different cooling rate. The microstructures of the specimens having the same compositions were changed with cooling rate and Nb content. The Widmanst$\ddot{a}$tten structure was observed on the furnace-cooled sample. The relationship between ${\alpha}$-Widmanst$\ddot{a}$tten and ${\beta}$-phase was the {0001}${\alpha}$//{110}${\beta}$, <11$\bar{2}$0>//<111>. The ${\beta}$-phase in Widmanst$\ddot{a}$tten structure of Zr-Nb alloys containing Nb more than solubility limit was identified as ${\beta}_{Zr}$ phase which was a stable phase at high temperature. In the water quenched samples, two kinds of martensite structures were observed depending on the Nb-concentration. The lath martensite was formed in Zr-0.2, 0.8 wt.% Nb alloys and the plate martensite having twins was formed in Zr-1.5 wt.% Nb alloy.

키워드

과제정보

연구 과제 주관 기관 : 한국원자력연구소

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