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
Combination of high feed turning with cryogenic cooling on Haynes 263 and Inconel 718 superalloys
F. J. Amigo,Gorka Urbikain,Octavio Pereira,P. Fernández-Lucio,A. Fernández-Valdivielso,L.N. López de Lacalle +5 more
TL;DR: In this paper, the effects of using oil emulsion and CO2 cryogenic coolant were also studied in high feed turning of Nickel-Chrome based superalloys, and the results indicated a good agreement between model predictions and experimental results for the three tested materials.
Journal ArticleDOI
Interlamellar boundary characterization in Ni-based alloy thermally sprayed coating
TL;DR: In this paper, the effect of high velocity oxygen fuel process on inconel 718 thermally sprayed coating microstructure was studied by XRD, transmission electron microscopy and STEM analyses.
Journal ArticleDOI
Warm shock consolidation of IN 718 powder
TL;DR: In this article, the effects of explosive type, explosive-to-powder mass ratio, powder container material and thickness, type of confinement, shielding material, and preheating temperature were investigated.
Proceedings ArticleDOI
Effect of Environment and Microstructure on the High Temperature Behavior of Alloy 718
E. Andrieu,R. Cozar,A. Pineau +2 more
TL;DR: In this article, the micromechanisms responsible for the transition in the fracture mode from transgranular to intergranular are reviewed and two interrelated mechanisms are discussed.
Journal ArticleDOI
Recrystallization behavior and tensile properties of laser metal deposited Inconel 718 upon in-situ ultrasonic impact peening and heat treatment
Yachao Wang,Jing Shi +1 more
TL;DR: In this article, the influence of in-situ layerwise UIP on the recrystallization behavior and tensile properties are investigated for Inconel 718 parts fabricated by the novel hybrid manufacturing process combining laser metal deposition (LMD) and UIP.
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.