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
Correlating Hot Deformation Parameters with Microstructure Evolution During Thermomechanical Processing of Inconel 718 Alloy
TL;DR: In this paper, a hot compression test was conducted to determine the processing window for deformation of solutionized Inconel 718 over a range of high temperature and strain rate.
Journal ArticleDOI
Characterizing Precipitation Defects in Nickel Based 718 Alloy
TL;DR: In this paper, the authors examined the crystallographic structure of the nickel base 718 alloy and the chemical ordering of Nb atoms and possible planar faults that may be observed in precipitates.
Journal ArticleDOI
Influence of supercritical debinding and processing parameters on final properties of injection-moulded Inconel 718
TL;DR: In this paper, a micro powder of Inconel 718 (nickel-based super-alloy) was chosen to elaborate the feedstock for metal injection-moulding process.
Journal ArticleDOI
On the interaction between γ′′ precipitates and dislocation microstructures in Nb containing single crystal nickel-base alloys
TL;DR: In this article, the metastable γ′′ phase has been studied in a Nb containing nickel-based alloy in single crystalline state, with a composition close to the commercially available superalloy IN718.
Journal ArticleDOI
Elastic strain energy control of the precipitate free zone around primary carbides in nickel base alloy 725
TL;DR: In this paper, the authors show that the PFZ around primary carbides (Nb, Ti) is also influenced by stress field in alloy 725, which is a nickel base alloy hardened by precipitates.
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.
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.