Surface Condition of New γ–γ′ Co-Al-Mo-Nb and Co-Al-W Cobalt-Based Superalloys After Oxidation at 800 °C

Journal Article · Thu Feb 15 04:00:00 EST 2018 · Journal of Materials Engineering and Performance

DOI:https://doi.org/10.1007/S11665-018-3127-Y· OSTI ID:22860652

Migas, Damian; Moskal, Grzegorz; Niemiec, Dawid ^[1]

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1. Silesian University of Technology, Institute of Materials Engineering (Poland)

A new type γ–γ′ Co-Al-Mo-Nb Co-based superalloys were developed due to limitations of basic Co-Al-W superalloys, related to tungsten alloying. The present study aims to characterization of new γ–γ′ Co-10Al-5Mo-2Nb (at.%) cobalt-based superalloy performance in terms of the high-temperature exposure under cyclic conditions, with particular regard to surface condition. Specimens were tested in cycles of high-temperature exposition (25, 50, 75, 100 and 150 h) in air environment at 800 °C. Detailed analysis of oxidized surfaces by scanning electron microscopy, energy-dispersive spectroscopy and x-ray diffraction was made at various intervals during testing. The cyclic oxidation behavior of new alloy was compared to the basic Co-9Al-9W (at.%) Co-based superalloy.

• OSTI ID: 22860652
• Journal Information: Journal of Materials Engineering and Performance, Journal Name: Journal of Materials Engineering and Performance Journal Issue: 2 Vol. 27; ISSN 1059-9495; ISSN JMEPEG
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
ALUMINIUM COMPOUNDS
COBALT ALLOYS
COMPARATIVE EVALUATIONS
HEAT RESISTING ALLOYS
MOLYBDENUM COMPOUNDS
NIOBIUM COMPOUNDS
QUATERNARY ALLOY SYSTEMS
SCANNING ELECTRON MICROSCOPY
SURFACES
TEMPERATURE RANGE 1000-4000 K
TERNARY ALLOY SYSTEMS
TUNGSTEN COMPOUNDS
X-RAY DIFFRACTION