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
Evaluation on elevated-temperature stability of modified 718-type alloys with varied phase configurations
TL;DR: In this paper, the precipitation behavior and thermal stability of the strengthening phases with various structures in modified Inconel 718 alloys by tailoring the Al/Ti ratio were studied.
Journal ArticleDOI
Effects of Carbon Content on Mechanical Properties of Inconel 718 Alloy
TL;DR: In this article, the microstructure and mechanical properties of different carbon-containing Inconel 718 alloys were investigated by the Thermo-Calc software and experiments, and the experimental results indicated that the morphology, distribution and types of carbides mainly existing in the form of MC were hardly influenced by solution treatment at 1050 °C for 1 h.
Journal ArticleDOI
Temperature-Dependent Misfit Stress in Gamma Double Prime Strengthened Ni-Base Superalloys
Ruiyao Zhang,H. L. Qin,Z. N. Bi,Jun Li,Shiladitya Paul,T. L. Lee,S. Y. Zhang,J. Zhang,Hongbiao Dong +8 more
TL;DR: In this article, the constrained misfit strain of Ni-base superalloy Inconel 718 was measured using neutron diffraction at various temperatures with the aid of the stress-induced variant selection method.
Journal ArticleDOI
The Effect of Aluminum on Microstructure and Mechanical Properties of ATI 718Plus Alloy
TL;DR: In this paper, the influence of aluminum concentration on the microstructure and mechanical properties of alloy ATI 718Plus was investigated, and the experimental results revealed that the content of aluminum has a significant effect on the solvus temperature and the chemical compositions of the £ A and ¤ phases of the alloy.
Journal ArticleDOI
Influence of the co/ni ratio on the γ and γ " precipitation in fe-ni-co-ta alloys
R. Cozar,André Pineau +1 more
TL;DR: Quist et al. as discussed by the authors investigated the effect of the number of the 7" phase on the size of the AsB and concluded that the number is at most 8.65.
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.