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Wednesday, July 22, 2020 | History

2 edition of Gravity segregation of primary particles during solidification of binary eutectiferous alloys found in the catalog.

Gravity segregation of primary particles during solidification of binary eutectiferous alloys

Surya P. Kodali

Gravity segregation of primary particles during solidification of binary eutectiferous alloys

by Surya P. Kodali

  • 15 Want to read
  • 18 Currently reading

Published .
Written in English

    Subjects:
  • Alloys -- Testing.,
  • Solidification.

  • Edition Notes

    Statementby Surya Prabhakararao Kodali.
    The Physical Object
    Paginationxvi, 151 l.
    Number of Pages151
    ID Numbers
    Open LibraryOL16739042M

    Abstract. Various papers on low-gravity fluid dynamics and transport phenomena are presented. Individual topics addressed include: fluid management in low gravity, nucleate pool boiling in variable gravity, application of energy-stability theory to problems in crystal growth, thermosolutal convection in liquid HgCdTe near the liquidus temperature, capillary surfaces in microgravity.   Particle segregation was systematically studied in a binary fluidized bed of inner diameter m with fine FCC and coarse millet particles as flotsam and jetsam, respectively. Segregation efficiencies of both flotsam and jetsam, axial and radial fraction profiles were studied and analyzed systematically. A new developed horizontal baffle was examined to see its effects on particles segregation.

    Consequently, this depression is often used to estimate the degree of modification which has taken place in the Al-Si alloy. Other alloying elements, such as magnesium and beryllium, together with varying amounts of iron, manganese and zinc as impurity elements, form intermetallic particles during solidification [4,5]. ences between the solid and liquid phases can result in settling or floating of detached solid particles or dendrites, and hence segregation, due to this effect. Thus, gravity-driven fluid flow effects can lead to (large) composi- tional changes, occurring over distances of the order of the dimensions of the ingot.

    gas-solid fluidized bed with binary system Taek Woon Hong1, Dong Hyun Lee2* Department of Chemical Engineering, SungkyunKwan University, , Seobu-ro Jangan-gu Suwon-si Gyeonggi-do, Republic of Korea Abstract—The mixing and segregation characteristics were investigated in gas-solid fluidized beds with binary solid mixture. Static Casting in Binary Alloys: Use of CDF Heterogeneous Nucleation of the Primary Phas e in the Rapid Solidification of Alwt%cu Alloy Droplet eld Simulations of Dendrite Competitive Growth During Directional Solidification of Binary Alloy.


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Gravity segregation of primary particles during solidification of binary eutectiferous alloys by Surya P. Kodali Download PDF EPUB FB2

Author of Gravity segregation of primary particles during solidification of binary eutectiferous alloys. @article{osti_, title = {Solidification of hypereutectic Al wt pct Cu alloy in microgravity and in unit gravity}, author = {Yu, H and Tandon, K N and Cahoon, J R}, abstractNote = {Solidification in microgravity aboard the space shuttle Endeavour resulted in a dramatic change in the morphology of the primary Al{sub 2}Cu phase compared to ground-based solidification in unit gravity.

D.N. Riahi, in Transport Phenomena in Porous Media II, INTRODUCTION. Convection effects during alloy solidification are known to be important, see for example Davis ().The convective flow affects the solid–liquid content within a porous layer, which exists adjacent to the solid–liquid interface, and influences the flow pattern and the critical conditions for the generation.

Gravity segregation of complex intermetallic compounds in liquid aluminum-silicon alloys Article (PDF Available) in Metallurgical and Materials Transactions A 26(4) April with Surya P. Kodali has written: 'Gravity segregation of primary particles during solidification of binary eutectiferous alloys' -- subject(s): Alloys, Testing, Solidification Load More.

Macrosegregation is present in the weld fusion zone in the case of laser welding of dissimilar materials 20 or using a filler wire different in chemical composition from the base metal. 23 Mixing or steering of melt in the molten pool can reduce macrosegregation.

The cross section and schematic of a laser weld, EDX analysis results of Fe and Ni elements and line analysis results of Fe and Ni. Surya P. Kodali has written: 'Gravity segregation of primary particles during solidification of binary eutectiferous alloys' -- subject(s): Alloys, Testing, Solidification.

calculate the solid fraction and the degree of micro-segregation in the mushy layer. In addition, the density difference between the liquid and solid phases is shown to induce a flow of the liquid phase during solidification, which causes macro-segregationof the resulting solid product.

Introduction mine local values of the temperature. Primary arm arrays formed during the directional solidification of a single-crystal binary alloy were investigated by performing large-scale phase-field simulations using the GPU supercomputer.

Binary mixtures of particles have been prepared in varying proportions and charged into a rectangular two-dimensional perspex bin and hopper. To record the degree of segregation, various methods of mechanical sampling have been investigated and found unsuitable.

Refinement of primary austenite structure was achieved by Chernov in by applying vibration during solidification. Since then, several other researchers have investigated and applied the beneficial effects of vibration energy to treat many alloys of aluminium, zinc, brass, etc.

during solidification [ 46, 47 ]. Solidification under microgravity is a unique way to remove the effects of buoyancy. Innoval is working with academic partners at University College Dublin on the European Space Agency XRMON project to investigate the solidification of aluminium alloys under zero gravity conditions.

As industrial partners, we’ve supplied some commercial alloy. However, the macro-segregation of C along the direction of super gravity was caused with higher weight percent at the upper area than that at the bottom of the sample.

The mechanism of solidification structure refinement and the C macro-segregation of Fe–1 wt% C steel in super gravity field were also discussed in this paper. In particle segregation, particulate solids, and also quasi-solids such as foams, tend to segregate by virtue of differences in the size, and also physical properties such as volume, density, shape and other properties of particles of which they are composed.

Segregation occurs mainly during the powder handling and it is pronounced in free-flowing powders. Gravity separation is an industrial method of separating two components, either a suspension, or dry granular mixture where separating the components with gravity is sufficiently practical: i.e.

the components of the mixture have different specific weight. All of the gravitational methods are common in the sense that they all use gravity as the dominant force. A simple one-pot emulsion-based process offers unique advantages in controlling assembly of particles with applications in producing structural colors, self-stratifying coatings, and capsules for drug delivery.

Here, we combine experiments and molecular dynamics simulations to demonstrate the importance of chemistry, density, and size of particles in controlling the surface segregation in.

Get this from a library. Solidification and Gravity III: Proceedings of the Third International Conference on Solidification and Gravity, held in Miskolc, Hungary, April-- The present publication provides the most up-to-date information for researchers and engineers who are interested in solidification processes.

Theoretical analyses, as well as studies of the. This study focuses on primary impurities, called intermetallics, in the microstructure of Al-Si-X alloys, their formation, effects and treatments to eliminate or ameliorate their deleterious effects. Intermetallic compounds are usually formed when alloying elements, such as Fe, Cu, Mn, Mg and Sr.

are added to Al-Si based alloys. These elements are depicted by X in the alloys formation expression. Keywords: heat diffusion, semi-analytical solution, numerical methods, binary fluid solidification Introduction The main difficulty in numerical simulations of casting with simultaneous solidification of metal alloys (e.g.

Al%Cu, Sn%Pb) is the broad range of. Get this from a library. Solidification and gravity V: selected peer-reviewed papers from the fifth International Conference on Solidification and Gravity, University of Miskolc, Miskolc-Lillafüred, Hungary, September [A Roósz;]. Abstract—This study investigates the segregation of dissimilar particles using fluidized bed.

A continuous gas-solid fluidized bed with 11 cm inner diameter and 50 cm height is used. Binary particles are Al2O3 powder with two different mean diameters ofmicron.The steady‐state segregation and dispersion of a binary system of particles in a liquid‐fluidized bed was investigated.

One of the species had a density of 1, kg/m 3 and the other 1, kg/m 3, and both exhibited a narrow size range of to mm.A generalized model for describing the dispersion coefficient, D, was proposed.Primary particles occur in different geometrical forms, for example in spheri-cal, cuboidal or rod-like geometry.

Particles without definedgeometry are gen-erally referred to “bulk” or “bulk-material”.Primary particles characteristically agglomerate to larger units (agglomerates) by .