Corrosion Science and Technology

The Corrosion Science Society of Korea (한국부식방식학회)
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Effects of Ti on High Temperature Oxidation of Ni-Based Superalloys

Ni 기지 초내열합금의 고온산화 저항성에 미치는 Ti의 영향

  • Park, Si-Jun (Muli-Material Research Center, Gwangju-Jeonnam Division, Korea Automotive Technology Institute) ;
  • Seo, Seong-Moon (High Temperature Materials Group, Korea Institute of Materials Science) ;
  • Yoo, Young-Soo (High Temperature Materials Group, Korea Institute of Materials Science) ;
  • Jeong, Hi-Won (High Temperature Materials Group, Korea Institute of Materials Science) ;
  • Jang, HeeJin (Department of Materials Science and Engineering, Chosun University)
  • 박시준 (자동차부품연구원 광주전남본부 소재융합연구센터) ;
  • 서성문 (재료연구소 내열재료그룹) ;
  • 유영수 (재료연구소 내열재료그룹) ;
  • 정희원 (재료연구소 내열재료그룹) ;
  • 장희진 (조선대학교 재료공학과)
  • Received : 2016.04.17
  • Accepted : 2016.05.25
  • Published : 2016.06.30
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Abstract

The effects of Ti on the high temperature oxidation of Ni-based superalloys were investigated by cyclic oxidation at $850^{\circ}C$ and $1000^{\circ}C$. The oxide scale formed at $850^{\circ}C$ consists of $Cr_2O_3$, $Al_2O_3$, and $NiCr_2O_4$ layers, while a continuous $Al_2O_3$ layer was formed at $1000^{\circ}C$. The oxidation rate of the alloy with higher Ti content was higher than the alloy with less Ti content at $850^{\circ}C$, possibly due to the increase in the metal vacancy concentration in the $Cr_2O_3$ layer involved by incorporation of $Ti^{4+}$. However, Ti improved the oxidation resistance of the superalloy at $1000^{\circ}C$ by reducing oxygen vacancy concentration in $Al_2O_3$ layer.

Keywords

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