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- Ni-22Cr-18Fe-9Mo계 ODS 합금의 미세조직 및 고온인장 특성 평가
- 정석환, 강석훈, 한창희, 김태규, 김도향, 장진성
- Microstructural Evaluation and High Temperature Mechanical Properties of Ni-22Cr-18Fe-9Mo ODS Alloy
- Seok-Hoan Jeong, Suk-Hoon Kang, Chang-Hee Han, Tae-Kyu Kim, Do-Hyang Kim, Jin-Sung Jang
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Journal of Korean Powder Metallurgy Institute 2011;18(5):456-462
DOI: https://doi.org/10.4150/KPMI.2011.18.5.456
2한국원자력연구원 원자력재료개발부
3한국원자력연구원 원자력재료개발부
4한국원자력연구원 원자력재료개발부
5연세대학교 신소재공학과
6한국원자력연구원 원자력재료개발부
1Department of Materials Science and Engineering, Yonsei University
2Nuclear Materials Division, KAERI
3Nuclear Materials Division, KAERI
4Nuclear Materials Division, KAERI
5Department of Materials Science and Engineering, Yonsei University
6Nuclear Materials Division, KAERI
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Abstract
Yttrium oxide is one of the most thermo-dynamically stable materials, so that it is generally used as a dispersoid in many kinds of dispersion strengthed alloys. In this study, a nickel-base superalloy is strengthened by dispersion of yttrium oxide particles. Elemental powders with the composition of Ni-22Cr-18Fe-9Mo were mechanically alloyed(M.A.) with 0.6 wt% Y_2O_3. The MA powders were then HIP(hot isotactic press)ed and hot rolled. Most oxide particles in Ni-22Cr-18Fe-9Mo base ODS alloy were found to be Y-Ti-O type. The oxide particles were uniformly dispersed in the matrix and also on the grain boundaries. Tensile test results show that the yield strength and ultimate tensile strength of ODS alloy specimens were 1.2~1.7 times higher than those of the conventional HastelloyTM X(R), which has the same chemical compositions with ODS alloy specimens except the oxide particles.
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