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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High-cycle Fatigue Properties of Alloy718 Base Metal and Electron Beam Welded Joint
TL;DR: In this paper, high-cycle fatigue properties of Alloy 718 plate and its electron beam (EB) welded joint were investigated at 293 and 77 K under uniaxial loading.
Journal ArticleDOI
Grain boundary segregation in Ni-base alloys: A combined atom probe tomography and first principles study
Anna Sophie Ebner,S. Jakob,Helmut Clemens,Reinhard Pippan,Verena Maier-Kiener,Shuang He,Werner Ecker,Daniel Scheiber,Vsevolod I. Razumovskiy +8 more
TL;DR: In this article, a combination of advanced experimental and theoretical methods are applied to reveal the grain boundary chemistry of the 725 Ni-base alloy at the atomic level. But the results of this investigation are presented and discussed in detail.
Journal ArticleDOI
Development of a new 718-type Ni-Co superalloy family for high temperature applications at 750∘C
TL;DR: In this article, the development of a new Alloy 718-type alloy is presented, where the microstructure is stable at 800 ∘ C, mechanical properties are similar to Alloy718, yet do not deteriorate beyond 650 ǫ c, and the forging window is wider than the one of Alloy718.
Journal ArticleDOI
Precipitation behavior of Alloy 625 and Alloy 625 plus
Li-Jen Yu,Emmanuelle A. Marquis +1 more
TL;DR: In this paper, the precipitation behavior of Alloy 625 and Alloy 625 Plus after thermal aging at 650°C up to 1000 h were quantitatively compared and it was shown that Alloy 625 plus exhibited higher number density and volume fraction and a slower coarsening rate of γ″ precipitates.
Journal ArticleDOI
Characterization of precipitation in gradient Inconel 718 superalloy
Jie Ding,Sichuang Xue,Zhongxia Shang,Jin Li,Yue Zhang,R. Su,Tongjun Niu,Haiyan Wang,Xinghang Zhang +8 more
TL;DR: Inconel 718 (IN718) superalloy is a well-established material for the application of aircraft engine and power generator due to its excellent performance at high temperatures 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.