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The cyclic oxidation behavior of the single crystal TMS‐82+ superalloy in humidified air
Author(s) -
Wu Y.,
Narita T.
Publication year - 2009
Publication title -
materials and corrosion
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.487
H-Index - 55
eISSN - 1521-4176
pISSN - 0947-5117
DOI - 10.1002/maco.200805174
Subject(s) - superalloy , materials science , nichrome , single crystal , metallurgy , analytical chemistry (journal) , chemistry , crystallography , alloy , chromatography
The cyclic oxidation behavior of a single crystal Ni‐based superalloy TMS‐82+ was studied at 800 and 900 °C for 200 h in water vapor (air plus 15% H 2 O). Regardless of the exposure temperature, time‐dependence of the growth rate of the scale for the superalloy was fitted by a subparabolic relationship. The oxidation rate was enhanced with increase in exposure temperature, which was evidenced by a higher mass gain and thicker scale. The oxides on the specimen at 800 °C consisted of (Ni,Co)O, CrTaO 4 , AlTaO 4 , Cr 2 O 3 , and θ‐Al 2 O 3 , whereas for the specimen exposed at 900 °C, spinels of NiCr 2 O 4 and (Ni,Co)Al 2 O 4 as well as α‐Al 2 O 3 were observed. An innermost dense α‐Al 2 O 3 layer was responsible for a stable growth rate of the scale after the initial rapid oxidation.