TEP 분석을 이용한 냉간가공된 Zr-based 합금의 등온열처리에 따른 회복 및 재결정 거동에 관한 연구

오영민; 정홍식; 김선진; Young Min Oh; Heung Sik Jeong; Seon Jin Kim

Korean Journal of Materials Research, Vol.11, No.6, 483-491, June, 2001

Study on the Recovery and Recrystalligation of Cold-lolled Zr-based Alloys by Thermoelectric Power Measurement During Isothermal Annealing

오영민, 정홍식, 김선진

한양대학교 공과대학 신소재공학부

Young Min Oh, Heung Sik Jeong, and Seon Jin Kim

Dept. of Materials Engineering, Hanyang University, Seoul, 133-791, Korea

초록

냉간가공된 Zr 합금을 575 ? C 에서 650 ? C 의 온도범위에서 유지시간을 달리하여 열처리하는 동안에 발생하는 회복 및 재결정 거동을 TEP(ThermoElectric Power)와 미소경도 분석을 통하여 연구하였다. 냉간가공과 열처리에 따른 합금의 회복 및 재결정온 격자결함, 공공, 전위, 적층결함 등이 소멸함에 따라 TEP가 증가하는 거동을 보였다. 이러한 TEP 분석은 미소경도 분석에 비해 재결정의 완료를 정확하게 예측할 수 있었으며, 특히, Zr-0.4Nb-xSn합금에서는 미소경도 분석으로 쉽게 구분하기 어려운 회복 및 재결정 단계를 명확하게 나타내었다. TBP와 미소경도 분석을 이용한 Zr-base합금의 재결정 거동에 따르면, Sn을 첨가하는 경우에 Sn이 치환형 고용체로 존재하기 때문에 이로 인한 응력장과 전위와의 상호작용에 기인하여 회복이 지연되는 현상을 가져왔으며, Nb함량을 증가시키는 경우에는 재결정 지연 효과가 미미하였으나, 석출물 형성에 의한 결정립 성장의 지연효과가 크게 나타났다.

The recovery and recrystallization behavior of cold-rolled Zr-based alloys during isothermal annealing at temperatures from 575 ? C to 650 ? C was studied by thermoelectric power and Vickers microhardness measurement. The recovery and recrystallization resulted in the increase of TEP doe to the extinction of lattice defect, vacancy, dislocation and stacking fault during isothermal annealing after cold- rolling. The completion of recrystallization could be determined much clearly by TEP behavior than by microhardness change in Zr-based alloys. Especially, the recovery and recrystallization were classified separately by TEP behavior in Zr-0.4Nb-xSn alloys. From the analysis of TEP behavior and microhardness, the addition of Sn caused to form the interaction between stain field and dislocation, which resulted in the delay of recovery in Zr-based alloys. The precipitation due the addition of Nb suppressed the grain growth after recrystallization effectively in Zr-based alloys.

Keywords:Zr-based allays;recovery;recrystallization;thermoelectric Power;Vickers microhardness

[References]

Cahn RW, Hassen P, Kramer EJ, Mater. Sci. Technol., 8, 436 (1996)
Scheonberger G, Information on Westinghouse Materials Programs (1991)
Sabol GP, et al., Zirconium in the Nuclear Industry, eighth International Symposium, 1023 (1989)
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Charquet D, Gros JP, Wadier JF
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Blatt FJ, Schroeder PA, Foiles CL, Greig D : Thermoelectric Power of Metals, (1976) (1976)
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Matucha KH, et al., Mater. Sci. Technol., 441 (1996)
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[Related Articles]

[1] Cahn RW, Hassen P, Kramer EJ, Mater. Sci. Technol., 8, 436 (1996)

[2] Scheonberger G, Information on Westinghouse Materials Programs (1991)

[3] Sabol GP, et al., Zirconium in the Nuclear Industry, eighth International Symposium, 1023 (1989)

[4] Garazarolli F, et al., Zirconium in the Nuclear Industry, ninth International Symposium, 1132 (1990)

[5] Isobe T, et al., Zirconium in the Nuclear Industry, ninth International Symposium, 5 (1990)

[6] Charquet D, Gros JP, Wadier JF

[7] NFIR/EPRI : Nineteenth NFIR Steering Committe Meeting, Sweden, Apr. 18-19, (1991) (1991)

[8] Mele P, Vauglin C, Fantozzi G, Derep JL, Charquet D, Zirconium in the Nuclear Industry : Seventh International Symposium, 939, 555 (1987)

[9] Benkirat D, Merle P, Borrelly R, Acta Metall., 36(3), 613 (1988)

[10] LUIGGI NJ, Metall. Mater. Trans. B, 28B, 125 (1997)

[11] Jeong JY, et al.: Symposium on Nuclear Materials and Feul 2000, Aug. 24-25, Taejeon, Korea, 665 (2000) (2000)

[12] Blatt FJ, Schroeder PA, Foiles CL, Greig D : Thermoelectric Power of Metals, (1976) (1976)

[13] Massalki TB : Binary Alloy Phase Diagrams, Vol. 3, (ASM, Ohio, 1986) 2788 (1986)

[14] Matucha KH, et al., Mater. Sci. Technol., 441 (1996)

[15] Massalki TB, Binary Alloy Phase Diagrams, 3, 3416 (1986)