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
Effect of heat-treatment on microstructural evolution and mechanical behaviour of severely deformed Inconel 718
TL;DR: In this paper, a short heat-treatment to these deformed samples at elevated temperature to ensue controlled recrystallization in the sheared zone was performed for 15min between 700°C to 900°C.
Journal ArticleDOI
Oxygen Embrittlement and Time-Dependent Grain-Boundary Cracking of ALLVAC 718PLUS
TL;DR: In this paper, the authors focus on the time-dependent intergranular cracking of a newly developed Ni-base superalloy ALLVAC 718PLUS grain-boundary (GB) cracking is due to the penetration of oxygen down grain boundaries and subsequent oxidation of GB particles.
Journal ArticleDOI
Precipitation hardening in Inconel* 625
TL;DR: In this article, the hardness of the nickel based superalloy Inconel 625, aged at 625, 700, and 760°C for different intervals of time ranging from 1 to 335 h, has been measured.
Journal ArticleDOI
Microstructure and fatigue crack growth behavior of Inconel 718 superalloy manufactured by laser directed energy deposition
TL;DR: Inconel 718 (IN718) specimens, manufactured by laser directed energy deposition (LDED), are subjected to three different heat-treatments to have different microstructural characteristics as mentioned in this paper.
Journal ArticleDOI
Microstructure-property relationships in directly aged Alloy 718 turbine disks
TL;DR: In this paper, the authors use hardness mapping, macro-etching, thermo-kinetic and FEM modeling to identify the regions of interest in a forged Alloy 718 turbine disk.
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.
Book
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.
Related Papers (5)
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