Journal ArticleDOI
Precipitation of the δ-Ni 3 Nb phase in two nickel base superalloys
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TLDR
In this article, the precipitation of the metastable δ-Ni3Nb phase has been studied in two niobium bearing nickel base superalloys and the morphology and distribution of precipitates have been examined and the crystallographic orientation relationship between the austenite and the δ phases has been determined.Abstract:
The precipitation of the equilibrium δ-Ni3Nb phase has been studied in two niobium bearing nickel base superalloys—INCONEL 718 and INCONEL* 625—both of which are hardenable by the precipitation of the metastableγ″-Ni3Nb phase. The morphology and the distribution of precipitates have been examined and the crystallographic orientation relationship between the austenite and theδ phases has been determined. The nucleation of theδ phase at stacking faults within pre-existing δ" precipitates has been discussed.read more
Citations
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Journal ArticleDOI
δ Phase precipitation in Inconel 718 and associated mechanical properties
TL;DR: In this paper, several heat treatments enabling the precipitation of the δ phase in various proportions and morphologies were conducted, and the results revealed that when γ″ and δ precipitates coexist, the material remains hardened regardless of the amount of δ.
Journal ArticleDOI
Investigations of γ′, γ″ and δ precipitates in heat-treated Inconel 718 alloy fabricated by selective laser melting
Guanghui Cao,T. Y. Sun,C.H. Wang,X. Li,M. Liu,Z. X. Zhang,P. F. Hu,Alan M. Russell,Reinhard Schneider,Dagmar Gerthsen,Zhongjiao Zhou,Chang-Peng Li,Guofeng Chen +12 more
TL;DR: Inconel 718 alloy samples were fabricated by selective laser melting (SLM) and electron microscopy observations showed that disc-shaped and cuboidal γ, and circular γ′ precipitates with an average size of 10-50nm developed within cellular austenite matrix as discussed by the authors.
Journal ArticleDOI
Grain-boundary precipitation in Allvac 718Plus
Ed Pickering,Harshal N. Mathur,Ayan Bhowmik,O.M.D.M. Messé,Jonathan S. Barnard,Mark Hardy,Robert Krakow,K. Loehnert,Howard J. Stone,Catherine M.F. Rae +9 more
TL;DR: In this article, the crystal structure and chemistry of this phase was found to be different from the orthorhombic Ni 3 Nb δ phase reported previously in Inconel 718 and Allvac 718Plus.
Journal ArticleDOI
Deformation characteristics of δ phase in the delta-processed Inconel 718 alloy
TL;DR: In this article, the hot working characteristics of delta phase in the delta-processed Inconel 718 alloy during isothermal compression deformation attemperature of 950 degrees C and strain rate of 0.005 s(-1), were studied by using optical microscope, scanning electron microscope and quantitative X-ray diffraction technique.
Journal ArticleDOI
Microstructure and mechanical properties of nickel based superalloy IN718 produced by rapid prototyping with electron beam melting (EBM)
TL;DR: A nickel alloy of a composition similar to that of the nickel based superalloy Inconel alloy 718 (IN718) was produced with the electron beam melting (EBM) process developed by Arcam AB as discussed by the authors.
References
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Book
A handbook of lattice spacings and structures of metals and alloys
W. B. Pearson,George H. Vineyard +1 more
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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Modern physical metallurgy
TL;DR: Modern Physical Metallurgy as mentioned in this paper describes the fundamental principles of physical metallurgy and the basic techniques for assessing microstructure and provides a balanced coverage of properties, characterization, phase transformations, crystal structure, and corrosion not available in other texts.
Book ChapterDOI
Configurational Thermodynamics of Solid Solutions
TL;DR: In this article, a review of theoretical models applicable to concentrated solid solutions is presented, focusing on concentrated solutions because dilute ones can be considered as special cases and because the interesting effects of clustering and ordering are most apparent at high solute concentrations.
Journal ArticleDOI
Precipitation of γ in the γ′of nickel-base superalloys
Journal ArticleDOI
Heat treatment of 706 alloy for optimum 1200 °F stress-rupture properties
TL;DR: In this article, a heat treatment for 706 alloy was developed which effectively optimizes the 1200°F stress-rupture properties of the alloy by precipitation of globular to plate-like Ni3Cb/Ni3Ti at the grain boundaries in conjunction with maintaining a fine as-forged grain structure.
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