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
Multiscale characterization of the 3D network structure of metal carbides in a Ni superalloy by synchrotron X-ray microtomography and ptychography
Zhiguo Zhang,Zhiguo Zhang,Jia Chuan Khong,Billy Koe,Shifeng Luo,Shi Huang,Ling Qin,Silvia Cipiccia,Darren Batey,Andrew J. Bodey,Christoph Rau,Yu-Lung Chiu,Zhu Zhang,Jean-Christophe Gebelin,Nick R. Green,Jiawei Mi +15 more
TL;DR: In this paper, the authors used synchrotron X-ray microtomography and ptychography to characterize the 3D network structure, morphology and distribution of metal carbides in an as-cast IN713LC Ni superalloy.
Journal ArticleDOI
Hot Deformation Behavior of a Ni-Based Superalloy with Suppressed Precipitation
Franco Lizzi,Franco Lizzi,Kashyap Pradeep,Kashyap Pradeep,Aleksandar Stanojevic,Silvana Sommadossi,Maria Cecilia Poletti +6 more
TL;DR: In this article, the authors describe the evolution of the microstructure and the stresses during hot deformation of a prototype alloy named IN718WP produced by powder metallurgy with similar chemical composition to the matrix of Inconel®718.
Journal ArticleDOI
Effect of microstructure on electrical conductivity of Inconel 718 alloys
TL;DR: In this paper, the microstructural evolution of Inconel 718 during aging processes was studied through a combination of eddy current testing, X-ray diffraction analysis, and metallography and hardness measurements.
Journal ArticleDOI
Comprehensive Microstructural Evaluation of Precipitation in Inconel 718
TL;DR: Inconel 718 is a precipitation strengthened Nickel-iron-based superalloy for application at high temperatures, and the degradation during service due to microstructural changes is monitored by ultrasonic measurements as mentioned in this paper.
Journal ArticleDOI
Evaluation of the superplastic formability of SP-Inconel 718 superalloy
M.S Yeh,C.W Tsau,Tung-Han Chuang +2 more
TL;DR: In this article, the superplastic formability of SP- lnconel 718 superalloy was evaluated using the argon blowing method and the optimum forming temperature range was found to be between 975 and 995 °C.
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.