Dendritic branching patterns in platforms of complex Ni-based single crystal castings
TLDR
In this paper, the dendritic branching patterns at variable cross-sections in Ni-based single crystal (SX) castings of different generations were investigated using optical microscope (OM), electro probe microanalyzer (EPMA), differential scanning calorimeter (DSC), Thermo-Cal software and Pro-CAST software.Abstract:
Dendritic branching patterns at variable cross-sections in Ni-based single crystal (SX) castings of different generations were investigated using optical microscope (OM), electro probe microanalyzer (EPMA), differential scanning calorimeter (DSC), Thermo-Cal software and Pro-CAST software. Results show that the dendritic branching patterns are similar in outward platform in SXs of different generations. That is, the primary dendrites (PDs) are introduced into the platform by developing a series of secondary dendrites (SDs) to occupy the bottom of the platform, and the ternary dendrites (TDs) originating from these SDs grow upward to fill up the platform. With the SX generation increasing, the undercooling of melts in the inward platform increases significantly due to the increasing alloying elements and the segregation in the directional solidification (DS) process, and the growth velocity of the dendrite tip increases according to the dynamic model of dendrite growth, which is beneficial for the high-order dendrite development. The stronger dendritic branching ability is shown in the inward platform of the higher generation Ni-based SX.read more
Citations
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Dendritic Growth Pattern and Dendritic Network Distortion in the Platform of a Ni-based Superalloy
TL;DR: In this article, the pattern of dendritic growth and distortion of Dendritic network in the platform has been investigated by one mold casting with different platform length during directional solidification.
Journal ArticleDOI
Influence of laser power on microstructure and tensile property of a new nickel-based superalloy designed for additive manufacturing
TL;DR: In this paper , the microstructure and tensile properties of a Ni-based superalloy specially designed for additive manufacture (AM) were investigated under different laser power (LP) conditions, and the results measured by X-ray diffraction analysis and scanning electron microscopy showed that no cracks are observed in as-deposited alloy, which has typical crystallography orientation and non-equilibrium solidification dendrite/cellular morphology.
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Evolution mechanism of crystallographic orientation in grain continuator bars of a Ni-based single-crystal superalloy prepared by Bridgman technology during directional solidification
TL;DR: In this paper , single-crystal rods with different diameters and deviation angles with respect to the solidification direction were produced by the Bridgman rapid solidification method at withdrawal rates of 3 and 6 mm·min-1 and used as grain continuators.
Journal ArticleDOI
Evolution mechanism of crystallographic orientation in grain continuator bars of a Ni-based single-crystal superalloy prepared by Bridgman technology during directional solidification
TL;DR: In this paper , single-crystal rods with different diameters and deviation angles with respect to the solidification direction were produced by the Bridgman rapid solidification method at withdrawal rates of 3 and 6 mm·min-1 and used as grain continuators.
References
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Book
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TL;DR: In this article, Atom Transfer at the Solid/Liquid Interface Morphological Instability of a Solid/ Liquid Interface Solidification Microstructure: Cells and Dendrites SolidificationMicrostructure, Eutectic and Peritectic Solute Redistribution Rapid Solidization Microstructures Summary Appendices Symbols Index
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TL;DR: In this paper, the breakdown of single-crystal solidification has been studied over a wide range of solidification conditions in ten superalloys with large variations in Re, Ta, and W content.
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M. Konter,M. Thumann +1 more
TL;DR: An overview of gas turbine materials selection, trends in high-temperature materials, environmental and temperature-protective coatings, and in some of manufacturing techniques for industrial gas turbine components is given in this article.
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The convergence-fault mechanism for low-angle boundary formation in single-crystal castings
TL;DR: In this paper, a tip-growth model for simulation of the growth of the dendritic network was developed, which predicts the local primary growth direction from among three possible [001] directions and identifies regions of convergent growth.
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Microscale simulation of stray grain formation in investment cast turbine blades
TL;DR: In this article, a combined cellular automaton-finite difference (CA-FD) model was used to simulate dendritic growth in the platform region of turbine blades and to study the influence of withdrawal velocity and thermal gradient on the formation of stray grains.