탄소 팩 세멘테이션 (Pack cementation) 공정을 통한 상용 Ti-48Al-2Nb-2Cr 합금의 고온 내산화성 개선과 탄소 확산 경로 해석

Translated title of the contribution: Enhanced High Temperature Oxidation Resistance of the Conventional Ti-48Al-2Nb-2Cr Alloy through Carbon Pack Cementation and Analysis of the Carbon Diffusion Path

Donghyeon Kim, Kwangsu Choi, Joonsik Park, Seonghoon Yi

Research output: Contribution to journalArticlepeer-review

1 Scopus citations

Abstract

γ-TiAl alloys have attracted interest as lightweight materials for structural applications at temperatures below 800 °C. With recent improvements in microstrutural control of the γ-TiAl alloys, resulting in excellent creep properties and high temperature strength, their use can be extended to temperatures higher than 800 °C. To increase their application temperature range, the oxidation resistance of γ-TiAl alloys must be improved through alloy design or coating techniques. To improve the high temperature oxidation resistance of γ-TiAl alloys, it is important to suppress the growth of TiO2 oxide by forming a dense coating layer to block oxygen atoms. In this study, we tried to improve the high temperature oxidation resistance of a conventional γ-TiAl alloy, Ti-48Al-2Nb-2Cr (Ti 4822) using a pack cementation process, with carbon sources and activating materials, XRD and EDS analysis results for the surface products indicated the formation of coating layers comprising oxides and carbides including TiC, Al4C3, Ti2AlC, and Ti3AlC. Based upon the sequential formation of coating layers and phase diagrams, the diffusion path of the carbon during the pack cementation process is proposed. Also, detailed carburization and oxidation behaviors of the γ-TiAl alloys in the temperature range of 800-1000 °C are discussed in terms of microstructural observations. Enhanced high temperature oxidation resistance was obtained in Ti-48Al2Nb-2Cr (Ti 4822) through a proper carbon pack cementation process.

Translated title of the contributionEnhanced High Temperature Oxidation Resistance of the Conventional Ti-48Al-2Nb-2Cr Alloy through Carbon Pack Cementation and Analysis of the Carbon Diffusion Path
Original languageKorean
Pages (from-to)723-731
Number of pages9
JournalJournal of Korean Institute of Metals and Materials
Volume60
Issue number10
DOIs
StatePublished - Oct 2022

Keywords

  • carburizing
  • diffusion path
  • oxidation
  • pack cementation
  • TiAl

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