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
Investigation on γ′ to γ″ transition in an IN718G superalloy during heat treatment, using first principle
TL;DR: In this article, the influence of heat treatment on phases' constitution of IN718G superalloy was investigated by means of microstructure observation and XRD analysis, and the results showed that nano-structures of In718G alloy consist of particle-like, disc-like and needle-like phases.
Journal ArticleDOI
Laser powder bed fused Inconel 718 in stress-relieved and solution heat-treated conditions
N. Hasani,C. Dharmendra,Mehdi Sanjari,Mehdi Sanjari,Fateh Fazeli,Babak Shalchi Amirkhiz,Babak Shalchi Amirkhiz,Hadi Pirgazi,Hadi Pirgazi,G.D. Janaki Ram,Mohsen Mohammadi +10 more
TL;DR: Inconel 718 cylindrical rods were fabricated using the laser powder bed fusion (L-PBF) technology in the vertical orientation as mentioned in this paper, and the rods were stress-relieved at 980°C for 15min before cutting them from the build plate.
Journal ArticleDOI
Correlation between grain boundary character distribution and δ-phase precipitation in nickel-based superalloy 718
Flávia da Cruz Gallo,Luiz Maurício Barreto de Azevedo,Cilene Labre,Leonardo Sales Araújo,Jean Dille,Jean Dille,Luiz Henrique de Almeida +6 more
TL;DR: In this article, the Ni3Nb-DOa intergranular precipitation was quantified along the GBs based on electron backscattering diffraction analysis to identify preferential precipitation sites in consonance with GB misorientation angles.
Proceedings ArticleDOI
Oxidation Characteristics and Thermal Expansion of Inconel Alloy 718 from 300 K to 1273 K
TL;DR: Loria et al. as discussed by the authors measured the coefficient of thermal expansion (CTE) of Inconel alloy 718 for the temperature range of 300 K to 1273 K and compared with the CTE of Ni.
Journal ArticleDOI
Cascading of the as-built microstructure through heat treatment and its role on the tensile properties of laser powder bed fused Inconel 718
R. Jayaraj,Punit Kumar,Hang Li Seet,Sharon Mui Ling Nai,Pei Wang,Upadrasta Ramamurty,Upadrasta Ramamurty +6 more
TL;DR: The microstructures and mechanical properties of the Ni-based superalloy, Inconel 718 (IN718), which was additively manufactured using the laser beam powder bed fusion (LB-PBF) technique in the as-built (AB) and heat treated (HT) conditions were investigated, with emphasis on the microstructural evolution from the AB to HT conditions and, in turn, on the tensile properties as mentioned in this paper.
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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