Investigation on Liquid Segregation during Rheo-Casting Process Based on Eulerian-Granular Multiphase Model

Wang, Jiao Jiao; Zhu, Qiang; Zhang, Fan; Li, Da Quan; He, You Feng

doi:10.4028/www.scientific.net/SSP.256.113

Paper Titles

Effects of Grain Refiner on the Microstructural Evolution during Making Semi-Solid Slurry of the A357 Alloy
p.88

The Kinetics of Melting: Liquid Fraction versus Time
p.94

Tensile Behavior of Semi-Solid C38 LTT Steel
p.100

Effect of Slurry Temperature Distribution on Semi-Solid Die Casting
p.107

Investigation on Liquid Segregation during Rheo-Casting Process Based on Eulerian-Granular Multiphase Model
p.113

Numerical Simulation of Thixo-co-Extrusion of 7075/AZ91D Double-Layer Tubes
p.119

Rheological Behavior and Fluidity of Semi-Solid SiCp/A357 Composites with Different SiC Addition Levels
p.126

Rheological Properties of Liquid Metals and Semisolid Materials at Low Solid Fraction
p.133

Application of Multiphase Modelling in Semi-Solid Die Casting: Blister Prediction
p.139

Home Solid State Phenomena Semi-Solid Processing of Alloys and Composites XIVInvestigation on Liquid Segregation during...

Investigation on Liquid Segregation during Rheo-Casting Process Based on Eulerian-Granular Multiphase Model

Abstract:

A crucial problem concerned with the semi-solid forming process is the liquid segregation phenomena during shape formation, especially for rheo-casting process. Liquid segregation occurs due to the separation phenomena of the solid grain and the liquid phase. In this work, using commercial finite element software, the liquid segregation during rheo-casting process was numerically investigated by Eulerian-granular multiphase model based on the comparable results of single phase model, Eulerian-granular two-phase and three-phase model, along with Eulerian-granular DDPM three-phase model. In the study, solid grains and liquid phases were regarded as rigid material and non-Newtonian fluid at microscale, separately. This validation was experimentally proved and also compared to the proposed relationship of power law, Herschel-Bulkley model with yield stress at macroscale.

Info:

Periodical:

Solid State Phenomena (Volume 256)

Main Theme:

Semi-Solid Processing of Alloys and Composites XIV

Edited by:

Ahmed Rassili

Pages:

113-118

DOI:

https://doi.org/10.4028/www.scientific.net/SSP.256.113

Citation:

J. J. Wang et al., "Investigation on Liquid Segregation during Rheo-Casting Process Based on Eulerian-Granular Multiphase Model", Solid State Phenomena, Vol. 256, pp. 113-118, 2016

Online since:

September 2016

Authors:

Jiao Jiao Wang *, Qiang Zhu, Fan Zhang, Da Quan Li, You Feng He

Keywords:

Eulerian-Granular Multiphase, Herschel-Bulkley Model, Power Law, Rheocasting

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Paper TitlePages

Rheology of Semi-Solid Steel Alloys at Temperatures up to 1500°C

Authors: Michael Modigell, Lars Pape, Horst R. Maier

Abstract: The investigation of the flow behavior of semi-solid steel alloys poses a great challenge by reason of high operation temperatures and the need of ceramic components for the measuring system. A high-temperature Couette rheometer has been developed to analyze flow properties of semi-solid alloys up to temperatures of 1500°C. In the present work the alloy under investigation is X210CrW12. Differently performed experiments clearly show its shear-thinning and time-dependent flow properties with a yield stress. This flow behavior is modeled using a Herschel-Bulkley approach where the experimental results achieved serve to identify model parameters.

606

Behaviour of Semisolid Slurry Flows through a Channel

Authors: Sudip Simlandi, Nilkanta Barman, Himadri Chattaopadhyay

Abstract: In case of metal sheet forming of alloys in semisolid state, modelling of the process is very essential to predict flow behaviour, temperature distribution of the alloy etc. towards improvement of the product quality and to reduce manufacturing costs. Accordingly, the present work develops a model to predict the behaviour during metal sheet forming of an Al-alloy (A356) in semisolid state. The semisolid alloy passes through a rectangular channel having small depth and larger width. The alloy in semisolid state is cooled from the top at a controlled rate. In the model, the respective flow field is represented by the momentum conservation equation. The non-Newtonian behaviour of the semisolid slurry is incorporated considering the Herschel–Bulkley model. The agglomeration and de-agglomeration phenomena of the suspended particles under shear are represented using a time dependent structural parameter. The temperature field is predicted considering the transient energy conservation equation, and hence the fraction of solid is continuously updated. The solution considers an apparent viscosity of the semisolid alloy as a function of structural parameter, shear stress and shear rate. The governing equations are finally solved by finite difference method. The work predicts velocity, temperature and liquid fraction distribution of the semisolid slurry.

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