Journal
MATERIALS & DESIGN
Volume 32, Issue 4, Pages 1981-1989Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.matdes.2010.11.067
Keywords
Non-ferros metals and alloys; Powder metallurgy; Corrosion
Categories
Funding
- Alexander von Humboldt Foundation
- National Natural Science Foundation of China [50831008, 50771011, 51001011]
- Research Fund for the Doctoral Program of Higher Education of China [20090006120011]
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Hot corrosion behavior of powder metallurgy (PM) Rene95 Ni-based superalloy in molten 25%NaCl + 75%Na2SO4 salts at 650 degrees C, 700 degrees C and 750 degrees C are investigated by weight loss measurements, X-ray diffraction (XRD), scanning electron microscopy (SEM), and energy dispersive X-ray spectroscopy (EDS). Experimental results show that hot corrosion kinetics follow a square power law at 650 degrees C and linear power laws at 700 degrees C and 750 degrees C. The corrosion layers on the surface of PM Rene95 superalloy are detected to be mainly composed of Cr2O3, NiO, and Ni3S2 at each temperature. Besides, small amounts of NiCr2O4 at 700 degrees C and NaCl at 750 degrees C are observed respectively. Cross-sectional morphologies and corresponding elemental maps indicate that corrosion layers near scale/alloy interface are composed of oxides at 650 degrees C while duplex oxides and sulfides at 700 degrees C and 750 degrees C. According to these results, a cooperating mechanism of oxidation and sulfuration for hot corrosion of PM Rene95 Ni-based superalloy is confirmed. (C) 2010 Elsevier Ltd. All rights reserved.
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