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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Local composition and nanoindentation response of δ-phase and adjacent γ′′-free zone in a Ni-based superalloy
TL;DR: In this paper , the authors examined a region adjacent to the δ-phase consisting of γ-matrix containing γ′-precipitates only and uncovered the width and compositional profile of this region via high-resolution characterization.
Effect of Different Heat Treatment Conditions on the Microstructure and Mechanical Properties of Inconel 718 Nickel Based Super Alloy Used in Petroleum Production Einfluss der Wärmebehandlungsparameter auf Mikrogefüge und mechanische Eigenschaften der Nickel-Superlegierung Inconel 718 beim Einsatz in der Erdölindustrie
TL;DR: In this paper, the microstructure and mechanical properties of the super alloy Inconel 718 subjected to different temperatures and times of solution and aging heat treatments were investigated for the fabrication of bolts used in the fixation of submarine pipes for oil extraction.
Journal ArticleDOI
Fatigue Crack Growth Behaviour of Conventional and Modified IN 718 Superalloys at 650 °C
TL;DR: In this paper, the fatigue crack growth behavior of modified IN 718 superalloy (Ni-0.02, C-19.04, Cr19.35, Fe-3.0033, B, all in wt.
Journal ArticleDOI
Effect of filler materials on dissimilar TIG welding of Inconel 718 to high strength steel
TL;DR: In this article , TIG welding was applied to join the high temperature materials of Inconel 718 to high strength steel, and the metallurgical and mechanical properties of the joints were also analyzed and compared between the two filler materials.
Journal ArticleDOI
Heat Treating of a 718Plus Superalloy
TL;DR: In this article, the results of a series of solution and precipitation heat treatments of rings made from ATI 718Plus with the goal of optimizing their processing and mechanical behavior are reported, including results of tensile tests conducted at room temperature and at high temperature and of hardness and stress-rupture testing.
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.