Journal ArticleDOI
Some aspects of the precipitation of metastable intermetallic phases in INCONEL 718
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In this article, the authors investigated the precipitation of the metastable intermetallic phases (γ and γ) in the commercial nickel base superalloy, INCONEL 718, over a wide range of aging temperatures.Abstract:
Some aspects of the precipitation of the metastable intermetallic phases —γ″ and γ″—in the commercial nickel base superalloy, INCONEL 718, have been investigated over a wide range of aging temperatures. It has been confirmed that the spherical γ″ particles and the ellipsoidal γ″ particles evolve predominantly through homogeneous nucleation. Precipitation of the former does not appear to precede that of the latter in this alloy. The tetragonal distortion associated with the γ″ particles has been found to increase with increasing precipitate size. It has been observed that at certain temperatures, physical association between precipitates of the two types occurs frequently, leading to the development of different composite precipitate morphologies. During coarsening, the precipitate size has been found to depend linearly on the cube root of the aging time for γ′ as well as γ″ particles.read more
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Microstructures and mechanical behavior of Inconel 718 fabricated by selective laser melting
Krista Amato,Sara M. Gaytan,Lawrence E Murr,E. Martinez,P. W. Shindo,Jennifer Hernandez,S. Collins,Francisco Medina +7 more
TL;DR: In this paper, the Inconel 718 cylinders were fabricated by selective laser melting in either argon or nitrogen gas from a pre-alloyed powder, and they exhibited columnar grains and arrays of oblate ellipsoidal precipitates oriented in a strong [2.0.0] texture determined by combined optical metallography, transmission electron microscopy, and X-ray diffraction analysis.
Journal ArticleDOI
Microstructure and hardness studies of Inconel 718 manufactured by selective laser melting before and after solution heat treatment
TL;DR: The microstructure of AM Inconel 718 in general and Selective Laser Melting (SLM) in particular is different from the material produced by conventional methods due to the rapid solidification process associated with the former as mentioned in this paper.
Journal ArticleDOI
Delta phase precipitation in Inconel 718
TL;DR: In this article, precipitation and dissolution kinetics of the δ-phase were studied in three wrought versions and one spray-formed (SF) version of the nickel alloy, Inconel 718.
Journal ArticleDOI
Fabrication of Metal and Alloy Components by Additive Manufacturing: Examples of 3D Materials Science
Lawrence E Murr,E. Martinez,Krista Amato,Sara M. Gaytan,Jennifer Hernandez,D. A. Ramirez,P. W. Shindo,Frank Medina,Ryan B. Wicker +8 more
TL;DR: In this paper, a review of additive manufacturing technologies for the fabrication of unusual and complex metal and alloy products by laser and electron beam melting is presented using 3D optical and transmission electron microscope image compositions representing examples of 3D materials science.
Journal ArticleDOI
Effect of standard heat treatment on the microstructure and mechanical properties of hot isostatically pressed superalloy inconel 718
TL;DR: In this article, the authors investigated the structure-property relationships in HIP+heat treated alloy 718 and suggested that the standard heat treatment recommended for wrought IN 718 is not suitable for HIPed alloy and has to be modified to realize optimum properties.
References
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The kinetics of precipitation from supersaturated solid solutions
I.M. Lifshitz,V.V. Slyozov +1 more
TL;DR: In this paper, an analysis is made of the process whereby diffusion effects can cause the precipitation of grains of a second phase in a supersaturated solid solution, and the kinetics of this type of grain growth are examined in detail.
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TL;DR: The Handbook of Lattice spacings and structures of metals and alloys as discussed by the authors is a handbook of argumentative essay structure spacing and lattice plane model modified by the incorporation of thermodynamic functions appropriate to the f.c.
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Diffraction contrast from spherically symmetrical coherency strains
Michael F. Ashby,L. M. Brown +1 more
TL;DR: In this article, the properties of images formed by diffraction contrast in thin metal foils viewed by transmission electron microscopy are studied by means of the dynamical theory of diffraction, including absorption.
Journal ArticleDOI
Morphology of y’ and y” precipitates and thermal stability of inconel 718 type alloys
R. Cozar,André Pineau +1 more
TL;DR: 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.
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