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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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.read more
Citations
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Journal ArticleDOI
Magnetron Sputtered TiN Coatings Modified by Chromium, Nickel and Electroless Nickel (EN) Interlayers on Mild Steel
TL;DR: In this paper, the effect of interlayers on the performance of TiN coatings on mild steel was studied using potemiodynamic measurement technique in deaerated IN H2SO4 electrolyte.
Journal ArticleDOI
Understanding the mechanical behaviour of 718 and 625 + nickel based super-alloys under cathodic polarization
TL;DR: In this article, the effect of hydrogen on the mechanical behavior of UNS N07718 (alloy 718) and UNS n07716 (aluminum alloy) nickel-based super-alloys was studied.
Dissertation
Modélisation isotherme et anisotherme de la limite d'élasticité précipitation-dépendante de l'Inconel 718
TL;DR: In this article, the authors present the result of travaux concerned with the effets des transitoires thermiques on the precipitation des phases intermetalliques dans le superalliage base nickel Inconel 718® and les consequences of cette precipitation sur les proprietes mecaniques de cet alliage.
Book ChapterDOI
Fatigue Test of the Inconel Alloy 718 Under Three Point Bending Load at Low Frequency
TL;DR: Inconel Alloy 718 is a high-strength, corrosion-resistant, and hardenable Ni-Cr alloy with good tensile, fatigue, creep, and rupture strength which has resulted in its usage in a wide range of applications as discussed by the authors.
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.