New Insights into the Formation Mechanism of Solid-Liquid Segregation in the Semi-Solid Processing: Macro-Micro Linkage Theory

28 Pages Posted: 12 Oct 2020

See all articles by Wenying Qu

Wenying Qu

Southern University of Science and Technology - Shenzhen Key Laboratory for Additive Manufacturing of High-Performance Materials

Daquan Li

General Research Institute for Non-ferrous Metals

Xiaogang Hu

Southern University of Science and Technology - Department of Mechanical and Energy Engineering

Min Luo

Southern University of Science and Technology - Department of Mechanical and Energy Engineering

Qiang Zhu

Southern University of Science and Technology - Shenzhen Key Laboratory for Additive Manufacturing of High-Performance Materials

Date Written: 2020

Abstract

Solid-liquid segregation is a typical problem in multiphase flow, especially in the die casting of metallic alloys. The avoidance of phase segregation in High Pressure Die Casting (HPDC), and Semi-solid Processing (SSP) for suspended flow is a benefit for improving product performance. At present, there is not a unified statement on the cause of the solid-liquid segregation defect. The formation mechanism of phase segregation is investigated by theoretical analysis from the perspective of hydrodynamic and rheology. The relationship between hydrodynamic parameters and characteristic rheological index is established. Maps of critical velocity, power-law index n, and consistency coefficient k are depicted for the semi-solid slurries. Then experiments and corresponding multiphase simulations were conducted to verify this theory. The macroscopic and microscopic linkage mechanism was proposed based on the theoretical discussion. This investigation not only provides important insights into the flow map of the semi-solid slurry, but also offers a key criterion of filling velocity for the avoiding of phase segregation for shear-thinning non-Newtonian fluids.

Keywords: Semi-solid, segregation, Multiphase, modeling, Simulation

Suggested Citation

Qu, Wenying and Li, Daquan and Hu, Xiaogang and Luo, Min and Zhu, Qiang, New Insights into the Formation Mechanism of Solid-Liquid Segregation in the Semi-Solid Processing: Macro-Micro Linkage Theory (2020). Available at SSRN: https://ssrn.com/abstract=3708673 or http://dx.doi.org/10.2139/ssrn.3708673

Wenying Qu (Contact Author)

Southern University of Science and Technology - Shenzhen Key Laboratory for Additive Manufacturing of High-Performance Materials ( email )

No 1088, xueyuan Rd.
Xili, Nanshan District
Shenzhen, Guangdong 518055
China

Daquan Li

General Research Institute for Non-ferrous Metals ( email )

Xiaogang Hu

Southern University of Science and Technology - Department of Mechanical and Energy Engineering ( email )

Min Luo

Southern University of Science and Technology - Department of Mechanical and Energy Engineering

Qiang Zhu

Southern University of Science and Technology - Shenzhen Key Laboratory for Additive Manufacturing of High-Performance Materials ( email )

No 1088, xueyuan Rd.
Xili, Nanshan District
Shenzhen, Guangdong 518055
China

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