Journal ArticleDOI
Morphology of y’ and y” precipitates and thermal stability of inconel 718 type alloys
R. Cozar,André Pineau +1 more
- Vol. 4, Iss: 1, pp 47-59
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In this article, the precipitation microstructure varies rapidly with aging temperature and composition, and the influence of composition and aging temperature on the conditions that bring about this compact morphology has been investigated.Abstract:
The precipitation of the γ’ (Ll2) and γ" (DO22) phases has been studied in four alloys Fe-Ni-Cr-Ti-Al-Nb containing a higher Ti + Al/Nb ratio than that of the INCONEL 718 alloy. For these alloys, the precipitation microstructure varies rapidly with aging temperature and composition. Bct γ"particles have always been found to precipitate on γ’ phase. Moreover, by aging three alloys above a critical temperature, a “compact ntorphology” has been observed: cube-shaped γ’ particles coated on their six faces with a shell of γ" precipitate. This microstructure has proved to be very stable on prolonged aging. A thermal stability better than that encountered in nominal INCONEL 718 alloy can thus be achieved. The influence of composition and aging temperature on the conditions that bring about this “compact morphology” has been investigated. A minimal Ti + Al/Nb ratio between 0.9 and 1 has been determined, allowing the “compact morphology” to be obtained.read more
Citations
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Journal ArticleDOI
Understanding the impact of texture on the micromechanical anisotropy of laser powder bed fused Inconel 718
Jakob Schröder,Alexander Evans,Efthymios Polatidis,Jan Čapek,Gunther Mohr,I. Serrano-Munoz,Giovanni Bruno +6 more
TL;DR: In this article , the influence of the build orientation and the texture on the microstructure and consequently the mechanical anisotropy of as-built Inconel 718 was demonstrated.
Journal ArticleDOI
Stability of the microstructure and elevated-temperature mechanical properties of additively manufactured Inconel 718 superalloy subjected to long-term in-service thermal cycling
TL;DR: In this article , the authors investigated the thermal stability of additively manufactured Inconel 718 (IN718) under a long-term thermal cycling exposure, similar to what is encountered in aircraft turbine engines, up to 3000 h.
Journal ArticleDOI
Investigation of short-term creep properties of a coarse-grained Inconel 718 fabricated by directed energy deposition compared to traditional Inconel 718
Ying Jie Li,Jaromir Dlouhy,Jaroslav Vavřík,Jan Džugan,Pavel Konopík,Tomáš Krajňák,Jozef Veselý +6 more
TL;DR: In this article , the effect of heat treatment and sample orientation on the creep behavior of coarse-grained Inconel 718 alloy fabricated by Directed Energy Deposition (DED) technique has been investigated at 650 °C in comparison to a conventional wrought material.
Shearing Mechanisms and Complex Particle Growth in Nickel Superalloy 718
TL;DR: In this article, the authors present a detailed overview of the physical and chemical properties of metamachines, including the following: 1 1.1.1 Traditional Alloy 718 Heat Treatments 3 1.2 Compositional effects and Solute Additions 4 1.3 γ′ and δ Structure and Morphology 5 1.4.
Journal ArticleDOI
Influence of thermal shock behavior on microstructure and mechanical properties of IN718 superalloy
TL;DR: In this paper, the influence of thermal shock behavior between 960°C and room temperature on microstructure and tensile properties of IN718 alloy after three heat treatments was investigated.
References
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Journal ArticleDOI
The Determination of the Elastic Field of an Ellipsoidal Inclusion, and Related Problems
TL;DR: In this paper, it is shown that to answer several questions of physical or engineering interest, it is necessary to know only the relatively simple elastic field inside the ellipsoid.
Journal ArticleDOI
Déformations de cohérence d'un précipité quadratique
TL;DR: In this paper, exact expressions for the elastic field due to a perfectly coherent precipitate having the form of a rectangular parallelepiped, the material being supposed elastically homogeneous and isotropic.
Journal ArticleDOI
The microstructure of 706, a new Fe−Ni-base superalloy
TL;DR: In this article, the phase relationships of Alloy 706 alloy were investigated and it was shown that on the basis of chemistry and micro-structural response, Alloy 606 alloy can be considered to be intermediate to the well-known alloys, 718 and 901.
Journal ArticleDOI
Heterogeneous precipitation of metastable γ′-ni3ti in a nickelbase alloy
TL;DR: In this article, the effect of prior deformation on the precipitation of L12 γ′-Ni3Ti in nickel-base Alloy 901 was investigated by thin foil microscopy.
Journal ArticleDOI
Fine Faults and Crystal Structures of Precipitates in Fe-Mo and Fe-W Alloys
Kōhei Yagisawa,Hiroshi Fujita +1 more
TL;DR: In this paper, the crystal structure and two-dimensional faults of the precipitates in Fe-Mo alloys were investigated using electron microscopic method, and the faults were found on {00.1}hex, {10.0}hex and {100}hex planes.