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Title: Steam oxidation behavior of Ni-base superalloys 690, 725 and X-750 at 600 and 650°C

Journal Article · · Corrosion Science
ORCiD logo [1]; ORCiD logo [1]; ORCiD logo [1]
  1. Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
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The 1-bar steam oxidation behavior of Ni-base superalloys 690, 725, and X-750 was evaluated at 600 and 650 °C for up to 5000 h. In addition to monitoring mass changes, microstructures of the 5000-h-exposed samples were characterized using scanning and transmission electron microscopy and energy dispersive x-ray spectroscopy. Together with thermodynamic calculations, the scale constitution and possible exfoliation was discussed. Alloy X-750 exhibited the best resistance to steam oxidation with the least metal thickness loss at 600 °C while alloy 690 at 650 °C. Alloy 725 exhibited more than two times metal thickness loss than the other two alloys at 650 °C.

Research Organization:
Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States)
Sponsoring Organization:
USDOE Office of Nuclear Energy (NE); USDOE
Grant/Contract Number:
AC05-00OR22725
OSTI ID:
1546527
Alternate ID(s):
OSTI ID: 1775693
Journal Information:
Corrosion Science, Vol. 157, Issue C; ISSN 0010-938X
Publisher:
ElsevierCopyright Statement
Country of Publication:
United States
Language:
English

Figures / Tables (14)

Table 1(p. 2)table Table 1
Table 2(p. 2)table Table 2
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Table 3(p. 15)table Table 3
Fig. 9(p. 16)figure Fig. 9
Fig. 10(p. 17)figure Fig. 10
Fig. 11(p. 18)figure Fig. 11

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Related Subjects

36 MATERIALS SCIENCE
A. Superalloys
B. SEM
B. TEM
C. Oxidation