A Solidification Analysis on Centrifugal Casting of Metal Matrix Composites Containing Graphite Particles.

Kang, Chung Gil; Rohatgi, Pradeep K.; Narendranath, C. S.; Cole, Gerald S.

doi:10.2355/isijinternational.34.247

Cited by 21 publications

(9 citation statements)

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“…The authors developed a coupled stochastic model to predict solidification grain structure in centrifugal casting, then they compared the results with that of cast Al-Si alloy. The description presented by several publications [23][24][25] is often incomplete and refers only to some chosen elements of the process. It is, hence, understood that the flow behavior of the molten metal must be understood clearly for getting a good casting.…”

Section: Introductionmentioning

confidence: 99%

Numerical Simulation and Cold Modeling experiments on Centrifugal Casting

Keerthiprasad

Murali²,

Mukunda

et al. 2010

Metall Mater Trans B

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KESTUR SADASHIVAIAH KEERTHIPRASAD, MYSORE SEETHARAM MURALI, PUDUKOTTAH GOPALIENGAR MUKUNDA, and SEKHAR MAJUMDARIn a centrifugal casting process, the fluid flow eventually determines the quality and characteristics of the final product. It is difficult to study the fluid behavior here because of the opaque nature of melt and mold. In the current investigation, numerical simulations of the flow field and visualization experiments on cold models have been carried out for a centrifugal casting system using horizontal molds and fluids of different viscosities to study the effect of different process variables on the flow pattern. The effects of the thickness of the cylindrical fluid annulus formed inside the mold and the effects of fluid viscosity, diameter, and rotational speed of the mold on the hollow fluid cylinder formation process have been investigated. The numerical simulation results are compared with corresponding data obtained from the cold modeling experiments. The influence of rotational speed in a real-life centrifugal casting system has also been studied using an aluminum-silicon alloy. Cylinders of different thicknesses are cast at different rotational speeds, and the flow patterns observed visually in the actual castings are found to be similar to those recorded in the corresponding cold modeling experiments. Reasonable agreement is observed between the results of numerical simulation and the results of cold modeling experiments with different fluids. The visualization study on the hollow cylinders produced in an actual centrifugal casting process also confirm the conclusions arrived at from the cold modeling experiments and numerical simulation in a qualitative sense.

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Section: Introductionmentioning

confidence: 99%

Numerical Simulation and Cold Modeling experiments on Centrifugal Casting

Keerthiprasad

Murali²,

Mukunda

et al. 2010

Metall Mater Trans B

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“…The direct measurement of solidification rate during centrifugal casting is difficult as the mould rotating speed is high. 20 So based on grain size observed at different zones within the casting, the solidification rate can be determined. 21 The slow rate of heat transfer (143.3 kW) between the mould and casting gives coarse grains at outer, and faster rate of heat transfer (265 kW) between the casting and hot air gives fine equi-axed grains at inner.…”

Section: Resultsmentioning

confidence: 99%

Improvement of mechanical and tribological properties of centrifugally cast functionally graded copper for bearing applications

Radhika

Reghunath

Sam

2018

Proceedings of the Institution of Mechanical Engineers, Part C:

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The functionally graded Cu-11Ni-4Si/10wt%WC composite and its alloy have been synthesized using horizontal centrifugal casting technique to compare the mechanical and tribological improvement and its utility for bearings and bushes. Microstructure analysis and mechanical tests showed 43% improvement in hardness and 160% improvement in tensile strength at inner radial distances compared to the outer composite periphery. Fractural analysis showed ductility for alloy, whereas for composites, brittleness at outer and a combination of both ductility and brittleness were observed at inner. Proportional rise in the wear rate and coefficient of friction was observed with increasing load and sliding distances for both composite and alloy. Composite showed a slight decline in the wear rate and coefficient of friction with an increase in the sliding velocity, while alloy showed a linear rise. Worn surfaces analysis of composite showed the formation of oxide layers, which reduced the coefficient of friction at higher sliding velocity, resulting in lower wear rate.

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“…Note that the particle volume fraction is a function of both time and location. Density (ρc) and specific heat (Cc) of the composite can be estimated by the rule of mixtures: 19) ......... (11) ......... (12) where Cl, Cs, and Cp represent the specific heat of liquid metal, solid metal, and particles, respectively, and ρs represents the density of solid metal.…”

Section: Composite Materials Propertiesmentioning

confidence: 99%

Numerical Modeling of Carbide Redistribution during Centrifugal Casting of HSS Shell Rolls

Nastac

2014

ISIJ Int.

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A numerical model was further developed and applied in this work to understand and optimize the carbide redistribution during centrifugal casting process used in manufacturing of high speed steel (HSS) shell rolls. This model will help to further understand the complex solidification behavior of the HSS roll. Performance of the HSS roll requires proper formation and distribution of the VC, (V, Mo)C, and Mo2C carbides as well as the eutectic carbides, which is shown by dimensional analysis to be dominated by centrifugal buoyancy effects and solidification and carbide kinetics. The model includes a rheology-viscosity sub-model to address the interference between different moving particles or classes of particles of different sizes. The carbide redistribution model was successfully validated against experimental work. A parametric study was performed to determine the key variables that influence the distribution of the VC, (V, Mo)C, and Mo2C carbides and refine the HSS microstructure including the wash (coating) material, superheat, C content of the shell material and mold temperature.

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A Solidification Analysis on Centrifugal Casting of Metal Matrix Composites Containing Graphite Particles.

Cited by 21 publications

References 0 publications

Numerical Simulation and Cold Modeling experiments on Centrifugal Casting

Numerical Simulation and Cold Modeling experiments on Centrifugal Casting

Improvement of mechanical and tribological properties of centrifugally cast functionally graded copper for bearing applications

Numerical Modeling of Carbide Redistribution during Centrifugal Casting of HSS Shell Rolls

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