A novel Re-free Ni-based single-crystal superalloy with enhanced creep resistance and microstructure stability

Wei, Bensheng; Lin, Yan Cherng; Huang, Zaiwang; Huang, Lan; Zhou, Kechao; Zhang, Longfei; Zhang, Lijun

doi:10.1016/j.actamat.2022.118336

Cited by 24 publications

(4 citation statements)

References 39 publications

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“…where a γ and a γ are lattice parameters of the γ and γ phases, which can be calculated by using the Caron model [37,39,40] according to the elemental concentrations in γ and γ phases:…”

Section: Microstructural Evolution During Thermal Exposure At 1050 °Cmentioning

confidence: 99%

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Microstructure, Mechanical Properties and Thermal Stability of Ni-Based Single Crystal Superalloys with Low Specific Weight

et al. 2023

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Ni-based single crystal (SX) superalloy with low specific weight is vital for developing aero engines with a high strength-to-weight ratio. Based on an alloy system with 3 wt.% Re but without W, namely Ni-Co-Cr-Mo-Ta-Re-Al-Ti, a specific weight below 8.4 g/cm3 has been achieved. To reveal the relationship among the composition, mechanical properties, and thermal stability of Ni-based SX superalloys, SXs with desirable microstructures are fabricated. Tensile tests revealed that the SX alloys have comparable strength to commercial second-generation SX CMSX-4 (3 wt.% Re and 6 wt.% W) and Rene′ N5 alloys (3 wt.% Re and 5 wt.% W) above 800 °C. Moreover, the elongation to fracture (EF) below 850 °C (>20%) is better than that of those two commercial SX superalloys. During thermal exposure at 1050 °C for up to 500 h, the topological close-packed (TCP) phase does not appear, indicating excellent phase stability. Decreasing Al concentration increases the resistance of γ′ rafting and replacing 1 wt.% Ti with 3 wt.% Ta is beneficial to the stability of the shape and size of γ′ phase during thermal exposure. The current work might provide scientific insights for developing Ni-based SX superalloys with low specific weight.

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Section: Microstructural Evolution During Thermal Exposure At 1050 °Cmentioning

confidence: 99%

“…where a γ and a γ′ are lattice parameters of the γ and γ′ phases, which can be calculated by using the Caron model [37,39,40]…”

Section: Microstructural Evolution During Thermal Exposure At 1050 °Cmentioning

confidence: 99%

Microstructure, Mechanical Properties and Thermal Stability of Ni-Based Single Crystal Superalloys with Low Specific Weight

et al. 2023

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“…Based on the current phase equilibria in nickel-based alloys with Os, a discussion on the possible substitution of Re with Os in new-generation nickel-based single-crystal superalloys was conducted, resulting in some promising but still tentative conclusions [16]. After that, based on experimental information and valuable assertions [13,16], Wei et al [17] attempted to develop new nickel-based single-crystal superalloys by replacing Re in commercial CMSX-4 with Os. It was observed that this new superalloy had better microstructural stability and creep resistance than CMSX-4.…”

Section: Introductionmentioning

confidence: 99%

The Microstructure, Solidification Path, and Microhardness of As-Cast Ni-Al-Cr-Os Alloys in a Ni-Rich Region

Lin,

Wei,

Yang

et al. 2023

Materials

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In this study, nine as-cast Ni-Al-Cr-Os alloys were prepared, and their constituent phases and microstructure were examined using X-ray diffraction and electron probe microanalysis techniques. The solidification paths of all the alloys in a Ni-rich corner were revealed based on a detailed analysis of the as-cast microstructure. The liquidus cube of the quaternary Ni-Al-Cr-Os system in a Ni-rich corner was established accordingly. A eutectic-type invariant reaction on the liquidus surface was explicitly identified, and its reaction can be expressed as L → α + β + γ. No quaternary invariant reaction was found in the alloys following the addition of Os. The Ni-Al-Cr-Os alloy points were then vertically mapped onto the Ni-Al-Cr liquid phase projection to better observe the effect of Os addition on the solidification path of the Ni-Al-Cr system. It was found that the addition of a small amount of Os has no significant effect on the solidification path of the Ni-Al-Cr system. Furthermore, the microhardness of each alloy, which was determined to be in the range of 207 HV to 565 HV, was found to be closely related to the phase constitution and phase fraction of the alloy.

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“…Ni-based cast superalloys have become the preferred materials for turbine blades of aerospace engines because of their excellent comprehensive properties at high temperature [ 1 , 2 , 3 ]. In recent years, the service temperature of turbine blades has been getting higher due to the increasing thrust-to-weight ratio of aero-engines.…”

Section: Introductionmentioning

confidence: 99%

Effect of Mo on the Microstructures and Mechanical Properties of the Polycrystalline Superalloy with High W Content

Quan¹,

Sun

Sheng

et al. 2022

Materials

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The effect of the Mo contents of 1.0 wt.%, 1.5 wt.%, 2.0 wt.%, and 3.0 wt.% on the microstructures and mechanical properties of the polycrystalline superalloy with a high W content was studied. The typical dendrite morphology was observed in the high-W superalloy with different Mo contents, containing γ matrix, γ′ phase, eutectic, and MC carbide. After the heat treatment, the primary MC carbides were decomposed into M6C carbides, while a needle-like topologically close-packed (TCP) phase was formed in the alloy with high Mo content, in contrast to the other three alloys with low Mo content. The Mo addition increased the lattice parameter of the γ and γ′ phases and also changed the lattice misfits of the γ and γ′ phase lattice misfits towards a larger negative. The addition of Mo improved the yield strength at room temperature due to the solid solution strengthening and coherency strengthening. The improvement of the stress rupture lives at 975 °C/225 MPa was due to the combination of the suppressed propagation of the microcracks by the carbides and a more negative misfit. When the Mo content reached 3.0 wt.%, the TCP phases formed and decreased the ultimate tensile strength and the stress rupture lives as a result.

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A novel Re-free Ni-based single-crystal superalloy with enhanced creep resistance and microstructure stability

Cited by 24 publications

References 39 publications

Microstructure, Mechanical Properties and Thermal Stability of Ni-Based Single Crystal Superalloys with Low Specific Weight

Microstructure, Mechanical Properties and Thermal Stability of Ni-Based Single Crystal Superalloys with Low Specific Weight

The Microstructure, Solidification Path, and Microhardness of As-Cast Ni-Al-Cr-Os Alloys in a Ni-Rich Region

Effect of Mo on the Microstructures and Mechanical Properties of the Polycrystalline Superalloy with High W Content

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