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Open AccessArticle

Effects of Cr, W, and Mo on the High Temperature Oxidation of Ni-Based Superalloys

1
Multi-Material Research Center, Gwangju-Jeonnam Division, Korea Automotive Technology Institute, 55 Jingok-sandan-jungangro, Gwangsan-gu, Gwangju 62207, Korea
2
High Temperature Materials Group, Korea Institute of Materials Science, 797 Changwondaero, Seongsan-gu, Changwon 51508, Korea
3
Department of Materials Science and Engineering, Chosun University, 309 Pilmundaero, Dong-gu, Gwangju 61452, Korea
*
Author to whom correspondence should be addressed.
Materials 2019, 12(18), 2934; https://doi.org/10.3390/ma12182934
Received: 12 August 2019 / Revised: 30 August 2019 / Accepted: 3 September 2019 / Published: 11 September 2019
(This article belongs to the Special Issue High Temperature Alloys and Intermetallic Materials)
The oxidation behavior of Ni–9.5Co–(8~12)Cr–(2.5~5.5)Mo–(4~8)W–3Al–5Ti–3Ta–0.1C–0.01B alloys was investigated at 850 °C and 1000 °C The mass change, the phase of oxides, and the cross-sectional structure of specimens were analyzed after cyclic oxidation tests. The oxide scale was composed mainly of Cr2O3 and NiCr2O4, but NiO, TiO2, and CrTaO4 were also found. Al2O3 was formed beneath the Cr oxide layer. The Cr oxide layer and internal Al oxide acted as barriers to oxidation at 850 °C, while Al oxide was predominantly protective at 1000 °C. Cr increased the mass gain after oxidation test at both temperatures. Mo increased the oxidation rate at 850 °C but decreased the oxidation rate at 1000 °C. W slightly increased the mass gain at 850 °C but did not produce a significant effect at 1000 °C. The effects of Cr, Mo, W, and the temperature were discussed as well as the volatilization of oxides, the valence number of elements, and diffusion retardation. View Full-Text
Keywords: high temperature oxidation; alloying element; Ni-based superalloy; cyclic oxidation high temperature oxidation; alloying element; Ni-based superalloy; cyclic oxidation
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Park, S.-J.; Seo, S.-M.; Yoo, Y.-S.; Jeong, H.-W.; Jang, H. Effects of Cr, W, and Mo on the High Temperature Oxidation of Ni-Based Superalloys. Materials 2019, 12, 2934.

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