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Korean Journal of Metals and Materials > Volume 54(10); 2016 > Article
Korean Journal of Metals and Materials 2016;54(10): 759-767. doi: https://doi.org/10.3365/KJMM.2016.54.10.759
Invar 36 합금 선재의 미세조직에 미치는 냉간 인발 및 열처리 공정의 영향
한승엽1, 장선아1, 은희철1, 최정훈1, 이기락1, 박환서1, 안도희1, 김수영2, 김재열2, 신상용3
1한국원자력연구원 핵주기공정개발부
2고려특수선재 연구2팀
3울산대학교 첨단소재 공학부
Effect of Cold Drawing and Heat Treatment on the Microstructure of Invar36 Alloy Wire
Seung Youb Han1, Seon Ah Jang1, Hee-Chul Eun1, Jung-Hoon Choi1, Ki Rak Lee1, Hwan Seo Park1, Do-Hee Ahn1, Soo Young Kim2, Jea Youl Kim2, Sang Yong Shin3
1Nuclear Fuel Cycle Process Development Division, Korea Atomic Energy Research Institute, Daejeon 34057, Republic of Korea
2R&D Center, KOS Ltd., Yangsan 50592, Republic of Korea
3School of Materials Science and Engineering, University of Ulsan, Ulsan 44610, Republic of Korea
Correspondence  Sang Yong Shin ,Tel: +82-52-259-2227, Email: sshin@ulsan.ac.kr
Received: 16 March 2016;  Accepted: 14 April 2016.  Published online: 5 October 2016.
ABSTRACT
In this study, the effect of cold drawing and heat treatment on the microstructure of Invar36 alloy wire was investigated. Invar36 alloy wire is used as a transmission line core material, and is required to have high strength. The diameter of the Invar36 alloy wire specimens were reduced from 16 mm to 4.3 mm after three cold drawing and two heat treatment processes, thereby increasing tensile strength. Specimens were taken after each of the cold drawing and heat treatment processes, and their microstructure and tensile properties were analyzed. The Invar36 alloy wire had a γ-(Fe, Ni) phase matrix before the cold drawing and heat treatment processes. After the cold drawing processes, {220} and {200} textures were mainly achieved. After the heat treatment processes, a {220} recrystallization γ-(Fe, Ni) phase was formed with fine carbides. The recrystallization γ-(Fe, Ni) phase grains had low dislocation density, so they probably accommodated a large amount of deformation during the cold drawing processes.
Keywords: Invar36 alloy, wire, cold drawing, heat treatment, microstructure
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