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
Boundary in γ″ precipitates in inconel 718 nickel-base superalloy
TL;DR: In this paper, the coalesced γ″ precipitate in the aged nickel-base superalloy has been investigated using a high resolution electron microscopy, which consists of several domains which keep the original orientation before encountering.
Journal ArticleDOI
Investigation of desulfurization of Inconel 718 superalloys by ESR type slags with different TiO2 content
TL;DR: In this paper, the effect of CaF2-CaO-Al2O3-MgO-TiO2 slag with various TiO2 contents on the desulfurization of Inconel 718 alloy was investigated at 1773 K.
Journal ArticleDOI
Enhancements of thermal structure stability in a Ni-Base superalloy
Jianxin Dong,X.S. Xie,S.H. Zhang +2 more
TL;DR: In this paper, a detailed study was undertaken to develop a compact morphology of [gamma][double prime]-Ni[sub 3]Nb, which showed higher thermal stability at age hardening test results.
Journal ArticleDOI
Effects of cold rolling on the precipitation and the morphology of δ-phase in Inconel 718 alloy
Yunpeng Mei,Chenxi Liu,Yongchang Liu,Xiaosheng Zhou,Liming Yu,Chong Li,Zongqing Ma,Yuan Huang +7 more
TL;DR: In this article, the effects of cold rolling on the microstructure, the precipitation behavior and the morphology of δ-phase, Inconel 718 alloy samples with different cold rolling reductions were aged for different periods at temperatures range from 850 °C to 1000 °C.
Journal ArticleDOI
On the habit plane of γ″-Ni3V precipitates
TL;DR: In this article, the crystalloaraphic habit of coherent γ″-Ni 3 V precipitates that have a bet DO 22 structure has been investigated and theoretical calculation based on the elastic energy theory predicts an unusual habit to be close to (102).
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.