Mo Effect on the Microstructure in Co-Al-W-Based Superalloys

Abstract:

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The as-cast and heat-treated microstructure has been investigated in Co-Al-W-based superalloys with additions of 2 and 4 at.% Mo. The results revealed that Mo promoted the formation of (μ+γ) eutectic structure in the as-cast alloys and μ-phase precipitation after solution treatment. In addition, after aging treatment at 900oC, an extensive network of DO19 precipitates was observed, besides the γ+γ′ primary phases and the μ phase inherited from the as-cast and solution-treated conditions. Meanwhile, a solid-state transformation from the μ phase to the DO19 phase occurred; and long-term aging enhanced this transformation. In addition, high levels of Mo promoted the DO19-phase precipitation.

Info:

Periodical:

Materials Science Forum (Volumes 654-656)

Main Theme:

Edited by:

Jian-Feng Nie and Allan Morton

Pages:

420-423

DOI:

10.4028/www.scientific.net/MSF.654-656.420

Citation:

F. Xue et al., "Mo Effect on the Microstructure in Co-Al-W-Based Superalloys", Materials Science Forum, Vols. 654-656, pp. 420-423, 2010

Online since:

June 2010

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Price:

$35.00

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