Cr-Al alloys are attracting attention as oxidation resistant coating materials for high temperature metallic materials due to their excellent high temperature stability. However, the mechanical properties and oxidation resistance of Cr-Al alloys can be further enhanced, and such attempts are made in this study. To improve the properties of Cr-Al alloys, Si is added up to 5 wt%. Casting specimens with different amounts of Si content are prepared by a vacuum arc remelting method and isothermally heated under steam conditions at 1,100oC for 1 hour. The as-cast microstructure of low Si alloys is mainly composed of only a Cr phase, while Al8Cr5 and Cr3Si phases are also observed in the 5% Si alloy. In the high Si alloy, only Cr and Cr3Si phases remain after the isothermal heating at 1,100oC. It is found that Si additions slightly decrease the oxidation resistance of the Cr-Al alloy. However, the microhardness of the Cr-Al alloy is observed to increase with an increasing Si content.

Abstract
 1. 서 론
 2. 실험 방법
 3. 결과 및 고찰
 4. 결 론
 References

• 김정민(한밭대학교) | Jeong-Min Kim (Department of Materials Science and Engineering, Hanbat National University) Corresponding author
• 김일현(한국원자력연구원) | Il-Hyun Kim (Light Water Reactor Fuel Technology Division, Korea Atomic Energy Research Institute)
• 김현길(한국원자력연구원) | Hyun-Gil Kim (Light Water Reactor Fuel Technology Division, Korea Atomic Energy Research Institute)