Hot-Gas Corrosion Resistance of DD9 Single Crystal Superalloy

Abstract:

The hot-gas corrosion resistance of DD9 single crystal superalloy at 900°Cwas investigated in the present study. The composition and the morphology of corrosion layer were characterized by energy dispersive X-ray analysis spectroscope (EDS) and scanning electron microscopy (SEM). The results show that DD9 single crystal superalloy has excellent hot-gas corrosion resistance and basically obeys parabolic rate law during corrosion test for 100 h at 900 °C. The irregular and prismatic morphology of NiO tightly piles each other on the surface after 100 h corrosion test. The corrosion products possess three layers, outer layer is predominate NiO with a little of Al₂O₃, middle layer is mixed oxide, and inner layer is sulfide. It was found that flake shaped NiS phase formed in the sulfide layer.

• Periodical: Materials Science Forum (Volume 849)
• Pages: 463-467
• DOI: https://doi.org/10.4028/www.scientific.net/MSF.849.463
• Online since: March 2016
• Authors: Zhen Xue Shi, Shi Zhong Liu, Xiao Guang Wang, Jia Rong Li
• Keywords: DD9, Hot-Gas Corrosion, Microstructure, Single Crystal Superalloy

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