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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Patent
Ni-base alloy for structural applications
TL;DR: A nickel-base alloy of up to 8 percent Fe, up to 16 percent Co, between 15 and 25 percent Cr, between 3 and 5 percent Al, between 7.5 and 7.8 percent Ni and incidental impurities, wherein the atomic ratio of the sum of Al and Ti to Nb is between 0.4 and 1.7, and, the composition including at least 10 percent of elements from the group of Al, Nb, and Ti.
Journal ArticleDOI
Determining the heat treatment behaviour of metal injection moulded and wrought alloy 718 using differential scanning calorimetry
J. O'Flynn,Stephen F. Corbin +1 more
TL;DR: In this paper, the heat treatment behavior of metal injection molded (MIM) and wrought alloy 718 was investigated using DSC, microscopy and hardness measurements, and the results showed that the differences in heat treatment behaviour appeared to be driven largely by differences in chemical composition rather than by processing route (wrought vs. MIM).
Journal ArticleDOI
Effect of Titanium Nitride Inclusions on the Mechanical Properties of Direct Laser Deposited Inconel 718
Kwang-Hyeok Lim,KenHee Ryou,Jae-Hoon Choi,Gwanghyo Choi,Wonseok Choi,Jeong-Hwan Lee,Chang-Seok Oh,Pyuck-Pa Choi,Gi-Dong Sim +8 more
Book ChapterDOI
Effect of Aging Heat Treatment on the Microstructure of Gas Tungsten Arc-Welded Inconel Superalloy 718
TL;DR: In this paper, the influence of aging heat treatment on gas tungsten arc-welded microstructure of alloy 718 was studied and the effect of heat treatment time on the micro-structure was evaluated.
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.