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Research Papers

Thermogravimetric Investigations of Novel γ–γ′ Co-Al-W and Co-Al-Mo-Nb Cobalt-Based Superalloys

[+] Author and Article Information
Grzegorz Moskal

Faculty of Materials Engineering and Metallurgy,
Silesian University of Technology,
Krasinskiego Street 8,
40-019 Katowice, Poland
e-mail: grzegorz.moskal@polsl.pl

Damian Migas

Faculty of Materials Engineering and Metallurgy,
Silesian University of Technology,
Krasinskiego Street 8,
40-019 Katowice, Poland
e-mail: damian.migas@outlook.com

Dawid Niemiec

Faculty of Materials Engineering and Metallurgy,
Silesian University of Technology,
Krasinskiego Street 8,
40-019 Katowice, Poland
e-mail: dawid.niemiec@polsl.pl

Agnieszka Tomaszewska

Faculty of Materials Engineering and Metallurgy,
Silesian University of Technology,
Krasinskiego Street 8,
40-019 Katowice, Poland
e-mail: agnieszka.tomaszewska@polsl.pl

1Corresponding author.

Contributed by the Materials Division of ASME for publication in the Journal of Engineering Materials and Technology. Manuscript received January 5, 2018; final manuscript received April 17, 2019; published online May 17, 2019. Assoc. Editor: Vadim V. Silberschmidt.

J. Eng. Mater. Technol 141(4), 041008 (May 17, 2019) (8 pages) Paper No: MATS-18-1006; doi: 10.1115/1.4043626 History: Received January 05, 2018; Accepted April 22, 2019

Cobalt-based γ–γ′ superalloys are novel heat-resistant materials suitable for high-temperature applications, such as components of the turbine engine. These alloys exhibit favorable strength and corrosion resistance at high temperatures owing to the γ–γ′ microstructure, analogous to that of Ni-based superalloys. The aim of this paper is to evaluate the oxidation behavior of basic Co-9Al-9W (at%) and new tungsten-free Co-10Al-5Mo-2Nb (at%) alloys at elevated temperatures. The investigation is concerned with thermogravimetric studies in the temperature range of 40–1200 °C. The oxidized surfaces after high temperature oxidation have been characterized using optical microscopy (OM), scanning electron microscopy (SEM), energy-dispersive X-ray spectroscopy (EDS), and X-ray diffraction analysis (XRD).

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Figures

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Fig. 1

The final cast utilized in the investigation

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Fig. 2

Thermogravimetric plots of investigated Co-based superalloys

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Fig. 3

Macrographs of oxidized surfaces after thermogravimetry: (a) Co-Al-W alloy and (b) Co-Al-Mo-Nb alloy

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Fig. 4

XRD patterns of oxidized surfaces after thermogravimetry: (a) Co-Al-W alloy and (b) Co-Al-Mo-Nb alloy

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Fig. 5

SEM micrographs and results of chemical composition analysis of oxidized surfaces after thermogravimetry: (a) Co-Al-W alloy and (b) Co-Al-Mo-Nb alloy

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Fig. 6

Micrographs of cross sections of specimens after high-temperature oxidation: (a) and (c) Co-Al-W; (b) and (d) Co-Al-Mo-Nb

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Fig. 7

SEM micrographs of cross sections of the oxidized surface: (a) Co-Al-W alloy and (b) Co-Al-Mo-Nb alloy

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Fig. 8

SEM-EDS mapping of the elements distribution in cross sections of oxidized surfaces: (a) Co-Al-W alloy and (b) Co-Al-Mo-Nb alloy

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Fig. 9

SEM-EDS linear analysis of the elements distribution in the cross section of the oxidized surface: (a) Co-Al-W alloy and (b) Co-Al-Mo-Nb alloy

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