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Korean Journal of Metals and Materials > Volume 55(12); 2017 > Article
Korean Journal of Metals and Materials 2017;55(12): 862-869. doi: https://doi.org/10.3365/KJMM.2017.55.12.862
Fe-14Cr계 페라이틱 산화물 분산 강화강의 고온 압축 및 크리프 특성에 미치는 열처리의 영향
김영균1, 주연아1, 박종관2, 김휘준3, 공만식4, 이기안1
1인하대학교 신소재공학과
2대한소결금속㈜ 기술연구소
3한국생산기술연구원
4고등기술연구원
Effect of Heat-Treatment on the Elevated Temperature Compression and Compressive Creep Properties of Fe-14Cr Ferritic Oxide Dispersion Strengthened (ODS) Steel
Young-Kyun Kim1, Yeun-Ah Joo1, Jong-Kwan Park2, Hwi-Jun Kim3, Man-Sik Kong4, Kee-Ahn Lee1
1Department of Materials Science and Engineering, Inha University, Incheon 22212, Republic of Korea
2R&D Center, Korea Sintered Metal Co., Ltd., Daegu 42983, Republic of Korea
3Korea Institute of Industrial Technology, Incheon 21999, Republic of Korea
4Institute for Advanced Engineering, Yongin 17180, Republic of Korea
Correspondence  Kee-Ahn Lee ,Tel: +82-32-860-7532, Email: keeahn@inha.ac.kr
Received: 14 July 2017;  Accepted: 18 September 2017.  Published online: 4 December 2017.
ABSTRACT
This study investigated the microstructure and the ambient-elevated temperature compression and elevated temperature creep properties of Fe-14Cr ferritic ODS steel manufactured by mechanical alloying (high energy ball milling) and hot extrusion processes. Initial microstructural observation of the as-extruded material identified elongated grains in the direction of extrusion; however, some recrystallization and grain growth were observed in the heat-treated material. The average grain sizes of the as-extruded material and heat-treated material were 0.4 and 1.1 μm, respectively. In addition, the heat treatment resulted in the increase in number density and the decrease in size of the nanocluster. A room temperature compression tests confirmed the heat-treated materials (1457 MPa) had relatively higher yield than the as-extruded material (1377 MPa), and a general tendency was observed that the difference in yield strength decreased as temperature increased. Furthermore, elevated temperature compressive creep tests confirmed that the heat-treated material had relatively greater creep resistance compared to the as-extruded material at all stress levels.
Keywords: mechanical alloying, oxide dispersion strengthening, microstructure, high temperature compression, high temperature creep
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