| 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 |
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Received: 14 July 2017; Accepted: 18 September 2017. Published online: 4 December 2017. |
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| ABSTRACT |
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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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