화학공학소재연구정보센터
홈 로그인 로그아웃 연락처 사이트맵
Korean Journal of Materials Research, Vol.11, No.8, 647-654, August, 2001
Export Citation
Zr-Nb계 합금의 석출물 특성과 산화 특성에 미치는 마지막 열처리 온도의 영향
Effect of Final Annealing Temperature on Precipitate and Oxidation of Zr- Nb Alloys
윤영균, 정용환, 박상윤, 위명용1
  • 한국원자력연구소 지르코늄신합금핵연료피복관개발팀
  • 1충북대학교 공과대학 재료공학과
Young Gyoon Yoon, Yong Hwan Jeong, Sang Yoon Park, and Myeong Yong Wey1
  • Advanced Ar-Alloy Development, KAERI, TaeJon 305-353, Korea
  • 1Depatment of Materials Engineering, Chungbuk National University, CheongJu 361-240, Korea
초록
Nb 첨가 Zr합금인 Zr-lNb합금과 Zr-lNb-lSn-0.3Fe함금의 석출물 및 산화 특성에 미치는 마지막 열처리 온도의 영향을 알아보기 위하여 최종 열처리 온도를 450 ? C 에서 800 ? C 까지 변화시켜 미세조직 및 산화 특성을 조사하였다. 부식 시험은 400 ? C , 수중기 분위기에서 270 일 동안 실시하였으며 X-선 회절법을 이용하여 산화막 결정 구조를 분석하였다. 마지막 열처리 온도가 600 ? C 이상일 때 두 합금 모두 β -Zr이 관찰되었으며 모두 재결정 이후 마지막 열처리 온도가 상승할수록 석출물의 면적 분율이 증가하는 경향을 나타내었다. 모든 열처리 온도 구간에서 Zr-lNb합금의 부식 저항성이 Zr-lNb-lSn-0.3Fe 합금에 비해 우수하였으며 두 합금 모두 재결정 이후 부식 저항성이 급격히 나빠졌다. 이는 600 ? C 이후 형성된 β -Zr의 영향으로 밝혀졌다.
ffects of final annealing temperature on the precipitate and oxidation were investigated for the Zr-lNb and Zr-lNb-lSn-0.3Fe alloys. The microstructure and oxidation of both alloys were evaluated for the optimization of final annealing process of these alloys in the annealing temperature regime of 450 to 800 ? C . The corrosion test was performed under steam at 400 ? C for 270 days in a static autoclave. The oxide formed was identified by low angle X-ray diffraction method. The β -Zr was observed at annealing temperature above 600 ? C . Above 600 ? C , the precipitate area volume fraction of Zr-lNb and Zr-1Nb-lSn-0.3Fe alloys appeared to be increased with increasing the final annealing temperature. The corrosion resistance of Zr-lNb was higher than that of Zr- lNb-lSn-0.3Fe alloy. The corrosion rate of both alloys were accelerated due to the formation and growth of β -Zr with increasing the annealing temperature.
Keywords:oxidation;final annealing;microstructure;fuel cladding;Zr alloy
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