Effect of Y₂O₃ on Microstructure and Oxidation Behavior of Aluminide Coating on Ni-Based Superalloy

Abstract:

The oxidation behavior of Ni-based superalloy GH586 which is treated by pack-cementation aluminizing was investigated. Scanning electron microscope and X-ray diffraction were used to analyze the microstructure of aluminide coatings and the surface morphologies of the oxide scales. Results show that the main phase of the aluminide coatings was NiAl. The aluminide coating can be formed at lower temperature due to the addition of rare earth oxide in the mixture powders. The thickness of aluminide coating at 900°C was about 110μm, and another aluminide coating with rare earth oxide Y2O3 at 800°C was about 38μm. The oxidation kinetics of aluminized specimens approximately followed a parabolic oxidation law at 1000°C. The morphology of the oxidation scales was primarily θ-Al2O3 with minor α-Al2O3. The scales of the coatings with rare earth oxide Y2O3 after oxidation was more dense.

• Periodical: Advanced Materials Research (Volume 1095)
• Pages: 603-607
• DOI: https://doi.org/10.4028/www.scientific.net/AMR.1095.603
• Online since: March 2015
• Authors: Yin Qun Hua*, Zhen Rong, Kang Min Chen, Yun Xia Ye, Wen Hui Wu, Rui Fang Chen
• Keywords: Aluminide Coating, Microstructure, Ni Based Superalloy, Oxidation Resistance, Rare Earth Oxide

References

[1] Jinfeng Huang, Guangpu Zhao, Lanying Jiao, Feng Di: Combustion failure analysis of GH202 and GH586 superalloy for rocket engine. Journal of Iron and Steel Research. 3(2005), pp.68-71.

[2] Li Tiefan: High Temperature Oxidation and Hot Corrosion of Metal, Chap. 1, 1rd edn, 13-20, 2003, China, Chemical industry press.

[3] Daiyu Deng, Hong Ye: Effect of CeO2 on microscopic structure and properties of H13 die steel, SURFACE TECHNOLOGY, 6(2010), P. 36-38.

[4] Zhirong Huang, Hong Xu, Peining Li: Effects of rare earth elements on oxidation behavior of pack-aluminized heat-resistant stainless steel, Chinese Rare Earths, 1(2002), P. 38-40.

[5] Xu Guohua: Study on hot-working parameters and heat treatment of GH586 superalloy, northeastern university, Shenyang, China, 2004, P. 8-20.

[6] Jianhui Yan, Guobin Chen, Jianhong Lu: Study on Ni-based alloy aluminization mechanism, Rare metal and cemented carbides. 144(2001), P. 8-11.

[7] Jinmin Zhang: Study of microstructure of the hot-dipped aluminum coating on steel and effect of race earth(La), Henan University of Science and Technology, Henan, China. 2006, P. 1-10.

[8] Fahamsyah H. Latief, Koji kakehi, EI-Sayed M. Sherif: High temperature oxidation behavior of aluminide on a Ni-based single crystal superalloy in different surface orientations, Progress in Natural Science Materials International. 2014, P. 1-8.

DOI: 10.1016/j.pnsc.2014.03.006

[9] Fahamsyah H. Latief, Koji kakehi, Yuma Tashiro: Oxidation behavior characteristics of an aluminized Ni-based single crystal superalloy CM186LC between 900 and 1100 in air, Journal of Industrial and Engineering Chemistry. 19(2013), P. 1926-(1932).

DOI: 10.1016/j.jiec.2013.02.039