Journal of the Korean Society for Heat Treatment (열처리공학회지)

The Korean Society for Heat Treatment (한국열처리공학회)
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Microstructures and Recrystallization Behavior with Heat-Treatment Conditions of Pure Zr

열처리 조건의 변화에 따른 순수 Zr의 미세조직 및 재결정 거동

  • Lim, Yoon-Soo (Dept. of Materials Engineering, Chungbuk University) ;
  • Wey, Myeong-Yong (Dept. of Materials Engineering, Chungbuk University) ;
  • Kim, Hyun-Gil (Dept. of Metallurgical Engineering, YonSei University) ;
  • Choi, Yang-Jin (Dept. of Metallurgical Engineering, Taejon National University of Technology) ;
  • Jeong, Yong-Hwan (Development of Advanced Cladding Materials, Korea Atomic Energy Research Institute)
  • 임윤수 (충북대학교 재료공학과) ;
  • 위명용 (충북대학교 재료공학과) ;
  • 김현길 (연세대학교 금속공학과) ;
  • 최양진 (대전산업대학교 금속공학과) ;
  • 정용환 (한국원자력연구소 핵연료피복관 개발팀)
  • Published : 1999.12.31
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Abstract

Effect of heat-treatment on the microstructure and recrystallization behavior of pure Zr was studied. The specimens were prepared under the various annealing temperatures from $400^{\circ}C$ to $800^{\circ}C$ and times from 300 to 5000 minutes after vacuum arc remelting. The recrystallization behavior was observed by a polarized optical microscope, TEM and micro-vickers hardness tester. With increasing the annealing time, the temperature region of hardness drop moved to the lower temperature region due to the recovery and recrystallization behaviors at the lower temperature. The recrystallization of cold-worked pure Zr was completed between 450 and $600^{\circ}C$. The size of recrystallized grain increased at $700^{\circ}C$ for 600min. Activation energy(Q) of pure Zr measured by the time for constant fraction technique was 78 KJ/mol.

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