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Morphology of y’ and y” precipitates and thermal stability of inconel 718 type alloys

R. Cozar, +1 more
- Vol. 4, Iss: 1, pp 47-59
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TLDR
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.

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Citations
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Journal ArticleDOI

Microstructure Evolution in Inconel 718 Produced by Powder Bed Fusion Additive Manufacturing

TL;DR: Inconel 718 is a precipitation strengthened, nickel-based super alloy of interest for the additive manufacturing (AM) of low volume, complex parts to reduce production time and cost compared to conventional subtractive processes as discussed by the authors .
Journal ArticleDOI

The effect of vanadium additions on the precipitation behaviour of Ni-Co-Cr-Nb alloys

TL;DR: In this article, four Ni-Co-Cr-Nb-V alloys containing varying amounts of vanadium were solution treated and then aged at 923, 1023 and 1123 K for various lengths of time.
Journal ArticleDOI

Study on Constitutive Relation of Nickel-Base Superalloy Inconel 718 Based on Long Short Term Memory Recurrent Neural Network

TL;DR: In this paper, a long short term memory (LSTM) recurrent neural network was trained to characterize the constitutive relationship of Inconel 718 under different conditions, and the experimental results show that the prediction results of the LSTM constitutive model are extremely consistent with the experimental data, which is significantly better than the modified Johnson-Cook (M-JC) model.
Journal ArticleDOI

The strengthening effects and mechanisms of alloying elements on interfaces for multiphase Ni-based superalloys: A first-principles study

TL;DR: In this paper , the authors investigated the interface properties of the Ni-based superalloy system using the first-principles calculations, and the strengthening mechanisms of alloying elements (3 d, 4 d and 5 d transition-metals) on the γ/γ, and γ′/γ , coexisting interfaces.
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.
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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.
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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.
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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.
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Fine Faults and Crystal Structures of Precipitates in Fe-Mo and Fe-W Alloys

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.
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