한국재료학회지 (Korean Journal of Materials Research)

  • 제31권3호
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  • Pages.156-161
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  • 2021
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  • 1225-0562(pISSN)
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  • 2287-7258(eISSN)
한국재료학회 (Materials Research Society of Korea)
권호 표지
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내산화성 Cr-Si-Al합금의 주조상태 및 고온가열 후의 미세조직 특성

Microstructural Characteristics of Oxidation Resistant Cr-Si-Al alloys in Cast State and after High Temperature Heating

  • 김정민 (한밭대학교 신소재공학과) ;
  • 김채영 (한밭대학교 신소재공학과) ;
  • 양원철 (한밭대학교 신소재공학과) ;
  • 박준식 (한밭대학교 신소재공학과)
  • Kim, Jeong-Min (Department of Advanced Materials Engineering, Hanbat National University) ;
  • Kim, Chae-Young (Department of Advanced Materials Engineering, Hanbat National University) ;
  • Yang, Won-Chul (Department of Advanced Materials Engineering, Hanbat National University) ;
  • Park, Joon-Sik (Department of Advanced Materials Engineering, Hanbat National University)
  • 투고 : 2021.01.19
  • 심사 : 2021.02.22
  • 발행 : 2021.03.27
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초록

Cr-Si based alloys are not only excellent in corrosion resistance at high temperatures, but also have good wear resistance due to the formation of Cr3Si phase, therefore they are promising as metallic coating materials. Aluminum is often added to Cr-Si alloys to improve the oxidation resistance through which stable alumina surface film is formed. On the other hand, due to the addition of aluminum, various Al-containing phases may be formed and may negatively affect the heat resistance of the Cr-Si-Al alloys, so detailed investigation is required. In this study, two Cr-Si-Al alloys (high-Si & high-Al) were prepared in the form of cast ingots through a vacuum arc melting process and the microstructural changes after high temperature heating process were investigated. In the case of the cast high-Si alloy, a considerable amount of Cr3Si phase was formed, and its hardness was significantly higher than that of the cast high-Al alloy. Also, Al-rich phases (with the high Al/Cr ratio) were not found much compared to the high-Al alloy. Meanwhile, it was observed that the amount of the Al-rich phases reduced by the annealing heat treatment for both alloys. In the case of the high temperature heating at 1,400 ℃, no significant microstructural change was observed in the high Si alloy, but a little more coarse and segregated AlCr phases were found in the high Al alloy compared to the cast state.

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