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
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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Book ChapterDOI
A TEM Study of Creep Deformation Mechanisms in Allvac 718Plus
TL;DR: In this article, a preliminary study on the evolution of creep deformation substructure in Ni-base superalloy Allvac 718Plus has been performed using diffraction contrast TEM characterization techniques.
Development of Novel Small Scale Mechanical Tests to Assess the Mechanical Properties of Ex-Service Inconel X-750 CANDU Reactor Components
TL;DR: Howard et al. as mentioned in this paper performed a detailed analysis of the degradation of an Inconel X-750 CANDU component in terms of its quantitative mechanical properties through the invention of two novel SSMTs.
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
Microstructural Evolution in Materials during Thermal Processing
TL;DR: This work presents a novel and scalable approach that allows for real-time analysis of the response of the immune system to natural disasters and its applications in medicine and sport.
Journal ArticleDOI
Accelerating optimization of IN718 by mapping alloying effects on phase stabilities and mechanical properties using high-throughput calculations
TL;DR: In this article , the sole/synergetic effect of various alloying elements on stabilities of the matrix (γ) and the precipitates (γ, γ) in Inconel 718 superalloys was systematically explored.
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.