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
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Journal ArticleDOI
The Overview of Intermetallic Phases Presented in Nickel Base Superalloys after Precipitation Hardening
TL;DR: The nickel base superalloys are progressive group of materials designed especially for application where others materials does not fit with its mechanical properties (such aluminium or copper alloys) or corrosion resistance at high temperature nor heat-temperature properties as mentioned in this paper.
Patent
Nickel-base alloys and articles made therefrom
TL;DR: A nickel-base alloy having favorable toughness and thermal fatigue resistance comprises, in weight percentages based on total alloy weight, 9 to 20 chromium, 25 to 35 iron, 1 to 3 molybdenum; 3.0 to 5.5 niobium; 0.2 to 2.0 aluminum, 0.3 to 3.5 titanium; less than 0.10 carbon; no more than 0.01 boron; nickel; and incidental impurities as mentioned in this paper.
Journal ArticleDOI
Nonlinear surface wave measurements on aged and laser shock surface-treated Inconel 718 superalloy
Vania M. Rodríguez-Herrejón,Alberto Ruiz,Carlos Rubio-González,Víctor H. López-Morelos,Jin-Yeon Kim,Laurence J. Jacobs +5 more
TL;DR: In this article, the behavior of the nonlinearity parameter (βR) measured using the second harmonic generation of Rayleigh surface waves propagating in the free surface of aged Inconel 718 (IN 718) superalloy specimens with and without laser shock processing (LSP).
Journal ArticleDOI
Thermal stability of an Ni-Cr-Mo-Nb alloy
TL;DR: In this article, the microstructural changes that occur in an Ni-Cr-Mo-Nb alloy after up to 1000 hours aging at 650°C, 760°C and 870°C were investigated.
Posted Content
A phase-field study of elastic stress effects on phase separation in ternary alloys
TL;DR: In this article, a microelastic phase-field model was developed to study phase separation in ternary alloy systems, where more than two misfitting phases are present in the microstructure.
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.