Phase Transformations in Nickel-Base Superalloys

Mihalisin, J. R.; Pasquine, D.L.

doi:10.7449/1968/superalloys_1968_134_170

Cited by 14 publications

(4 citation statements)

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“…With regard to σ precipitation, Hunt 62 showed that for RR1000 the application of a stress during thermal exposure increased the precipitation rate, and a similar effect has been observed in other polycrystalline alloys. 63–65 However, Dreshfield and Ashbrook 66 and Acharya and Fuchs 67 observed the suppression of σ formation with the application of stress for a polycrystalline and a single-crystal alloy, respectively. Similarly, the rate of formation of µ, has been observed to either increase 7 or decrease 68 under an applied stress, or vary depending on the magnitude of the stress.…”

Section: Factors Affecting the Precipitation Of Tcp Phasesmentioning

confidence: 99%

Formation and effect of topologically close-packed phases in nickel-base superalloys

Wilson

2017

Materials Science and Technology

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The formation of topologically close-packed (TCP) phases in nickel-base superalloys is an issue of increasing importance as alloys are designed with higher refractory element contents to meet the requirements of next generation turbine engines. This review considers the factors that affect an alloy's susceptibility to TCP formation. In particular, the debate surrounding the effect of certain individual elements, such as Co and Re, in promoting or suppressing TCP formation is examined alongside the various mechanisms that have been proposed to account for this behaviour. In addition, the detrimental effects of these phases on the alloy's mechanical properties are discussed, including crack initiation at precipitates, depletion of solid solution strengthening refractory elements and the effect on γ/γʹ rafting behaviour.

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Section: Factors Affecting the Precipitation Of Tcp Phasesmentioning

confidence: 99%

Formation and effect of topologically close-packed phases in nickel-base superalloys

Wilson

2017

Materials Science and Technology

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“…The yield strength and the ultimate strength of the additively grown intermetallic compound at room temperature reached 100 MPa and 203 MPa, respectively. The outstanding contribution of the γ'-phase to the strengthening of the γ-γ' systems is determined by the negative temperature dependence of its yield strength and by the activation of latent plasticity, which prevents material from premature fracture [12,18,19]. R.F.…”

Section: Introductionmentioning

confidence: 99%

“…The size of the Cr atoms allows them to occupy the sites of both components of the A 3 B compound [1,18]. But for the γ'-phase extracted from the 713C alloy, J. Mihalisin and D. Pasquine demonstrated that most of the chromium atoms are located on the aluminum sublattice; that is, they occupy the right side of the A 3 B compound [19]. Thus, chromium, when introduced into a nickel alloy, can increase the volume fraction of the γ'-phase at a given Al content [19].…”

Section: Introductionmentioning

confidence: 99%

“…But for the γ'-phase extracted from the 713C alloy, J. Mihalisin and D. Pasquine demonstrated that most of the chromium atoms are located on the aluminum sublattice; that is, they occupy the right side of the A 3 B compound [19]. Thus, chromium, when introduced into a nickel alloy, can increase the volume fraction of the γ'-phase at a given Al content [19]. In other words, alloying a Ni-Al alloy with chromium atoms can increase the γ'-phase content and increase the high-temperature deformability of the compound.…”

Section: Introductionmentioning

confidence: 99%

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Microstructure, Phase Composition, and Mechanical Properties of Intermetallic Ni-Al-Cr Material Produced by Dual-Wire Electron-Beam Additive Manufacturing

Astafurova,

Reunova,

Zagibalova

et al. 2024

Metals

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Electron-beam additive manufacturing is one of the most promising methods for creating complex metal parts and structures. Additive manufacturing has already gained wide acceptance in the creation of various constructions from aluminum, copper, titanium, and their alloys as well as different classes of steels and other metallic materials. However, there are still many challenges associated with the additive manufacturing and post-production processing of intermetallic alloys. Thus, it is currently an urgent task for research. In this work, heat-resistant intermetallic alloys based on nickel, aluminum, and chromium were produced by dual-wire electron-beam additive manufacturing using commercial NiCr and Al wires. The microstructure, phase composition, and microhardness of the intermetallic billets are strongly dependent on the ratio of NiCr and Al wires, which have been fed during the additive growth of the material (NiCr:Al = 3:1 and NiCr:Al = 1:3). A metal-matrix composite material (Al3Ni-based intermetallide in Al-based matrix) was fabricated using the NiCr:Al = 1:3 ratio of the wires during the deposition. In tension, it fractures in a brittle manner before the plastic deformation starts, and it possesses a high microhardness of 6–10 GPa with a high dispersion of the value (the mean value is 8.7 GPa). This is associated with the complex phase composition of the material and the high fraction of a brittle Al3Ni intermetallic phase. In the material, obtained with the ratio NiCr:Al = 3:1, the ordered Ni3Al(Cr) and disordered Ni3Cr(Al) intermetallides are the dominating phases. Its microhardness turned out to be lower (4.1 GPa) than that in Al + Al3Ni-based composite, but intermetallic Ni3Al-based alloy demonstrates good mechanical properties in a high-temperature deformation regime (650 MPa, more than 10% elongation at 873 K). Microstructural studies, analysis of phase composition, and tensile mechanical properties of additively produced intermetallic materials show the perspective of dual-wire electron-beam additive manufacturing for producing intermetallic compounds for high-temperature applications.

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Investigation of equilibrium and phase stability in the liquid/solid state in nickel-based wrought superalloys

Rosen

Dirnfeld

Bamberger

et al. 1995

JOURNAL OF MATERIALS SCIENCE

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Phase Transformations in Nickel-Base Superalloys

Abstract: A study has been made of the phase transformations that occur during long time rupture testing of IN-

Cited by 14 publications

References 0 publications

Formation and effect of topologically close-packed phases in nickel-base superalloys

Formation and effect of topologically close-packed phases in nickel-base superalloys

Microstructure, Phase Composition, and Mechanical Properties of Intermetallic Ni-Al-Cr Material Produced by Dual-Wire Electron-Beam Additive Manufacturing

Investigation of equilibrium and phase stability in the liquid/solid state in nickel-based wrought superalloys

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