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

Fei Xue; Zhi Qiang Li; Qiang Feng

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

Paper Titles

The Fabrication of Titanium Aluminide Matrix Composite Sheet by Rolling and Reaction Annealing
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Welding Soundness of a Thick-Walled 9Cr-1Mo Steel
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Fundamentals of Spark-Plasma Sintering: Applications to Net-Shaping of High Strength Temperature Resistant Components
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Construction of a High Temperature Grade 91 Sodium Component Test Loop
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Mo Effect on the Microstructure in Co-Al-W-Based Superalloys
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High Temperature Strength of Ir/Ir₂Y Two Phase Alloys in the Ir-Pt-Y System
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Grain Refinement and Nuclei Formation Mechanism of Ni-Based Superalloy K417 with Low Voltage Pulsed Magnetic Casting
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The Effect of Ti Addition on Phase Equilibria among Ni (A1), Ni₃Al (L1₂) and Ni₃V (D0₂₂) Phases
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Microstructural Characterization of Nb-Al Base ODS Alloys
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HomeMaterials Science ForumMaterials Science Forum Vols. 654-656Mo Effect on the Microstructure in Co-Al-W-Based...

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

Abstract:

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.