Oxide dispersion-strengthened (ODS) steel has excellent high-temperature properties, corrosion resistance, and oxidation resistance, and is expected to be applicable in various fields. Recently, various studies on mechanical alloying (MA) have been conducted for the dispersion of oxide particles in ODS steel with a high number density. In this study, ODS steel is manufactured by introducing a complex milling process in which planetary ball milling, cryogenic ball milling, and drum ball milling are sequentially performed, and the microstructure and high-temperature mechanical properties of the ODS steel are investigated. The microstructure observation revealed that the structure is stretched in the extrusion direction, even after the heat treatment. In addition, transmission electron microscopy (TEM) analysis confirmed the presence of oxide particles in the range of 5 to 10 nm. As a result of the room-temperature and high-temperature compression tests, the yield strengths were measured as 1430, 1388, 418, and 163 MPa at 25, 500, 700, and 900oC, respectively. Based on these results, the correlation between the microstructure and mechanical properties of ODS steel manufactured using the composite milling process is also discussed.

Abstract
1. Introduction
2. Experimental method
3. Results and Discussion
    3.1 미세조직 관찰 결과
    3.2 고온 압축 특성 및 변형 거동
4. Conclusion
References

• 이정욱(인하대학교 신소재공학과) | Jung-Uk Lee (Department of Materials Science and Engineering, Inha University)
• 김영균(인하대학교 신소재공학과/한국재료연구원 금속재료연구본부 특수합금연구실) | Young-Kyun Kim (Department of Materials Science and Engineering, Inha University/Advanced Metals Division, Department of Special Alloys, Korea Institute of Materials Science)
• 김정한(국립 한밭대학교 신소재공학과) | Jeoung Han Kim (Department of Materials Science and Engineering, Hanbat National University)
• 김휘준(한국생산기술연구원) | Hwi-Jin Kim (Korea Institute of Industrial Technology)
• 이기안(인하대학교 신소재공학과) | Kee-Ahn Lee (Department of Materials Science and Engineering, Inha University) Corresponding Author