Numerical methods for controlling shape, size and microstructure of sintered compacts

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Abstract

Predictions of the shrinkage behavior and the microstructural evolution of powder compacts during sintering are important to control the shape, size, and properties of sintered parts. Three kinds of numerical methods for simulating the sintering process at particle level are reviewed, and their characteristics are compared. First, a repeated unit cell model used in the finite element analysis for sintering is introduced. By analyzing the diffusional creep due to the surface tension, various kinds of information about powder particles such as the distributions of stresses and strain rates can be obtained. Secondly, phase-field modeling of microstructural evaluation in sintering process is presented for mesoscale simulation. Anisotropic abnormal grain growth at the later stage of sintering is demonstrated by considering the change in interfacial energy and mobility. Phase-field simulation of grain growth behavior in polycrystalline powder is also conducted. However, it is difficult to compute the sintering shrinkage in the phase-field approach by itself. Finally, a combined phase-field/discrete-element method is proposed to treat both grain boundary migration and sintering shrinkage, as a useful tool for mesoscale simulation.

Original languageEnglish
Pages (from-to)3-9
Number of pages7
JournalFuntai Oyobi Fummatsu Yakin/Journal of the Japan Society of Powder and Powder Metallurgy
Volume63
Issue number1
DOIs
Publication statusPublished - Jan 1 2016
Externally publishedYes

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Numerical methods
Sintering
Microstructure
Powders
Grain growth
Microstructural evolution
Interfacial energy
Finite difference method
Surface tension
Strain rate
Creep
Grain boundaries
Finite element method

All Science Journal Classification (ASJC) codes

  • Mechanical Engineering
  • Industrial and Manufacturing Engineering
  • Metals and Alloys
  • Materials Chemistry

Cite this

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title = "Numerical methods for controlling shape, size and microstructure of sintered compacts",
abstract = "Predictions of the shrinkage behavior and the microstructural evolution of powder compacts during sintering are important to control the shape, size, and properties of sintered parts. Three kinds of numerical methods for simulating the sintering process at particle level are reviewed, and their characteristics are compared. First, a repeated unit cell model used in the finite element analysis for sintering is introduced. By analyzing the diffusional creep due to the surface tension, various kinds of information about powder particles such as the distributions of stresses and strain rates can be obtained. Secondly, phase-field modeling of microstructural evaluation in sintering process is presented for mesoscale simulation. Anisotropic abnormal grain growth at the later stage of sintering is demonstrated by considering the change in interfacial energy and mobility. Phase-field simulation of grain growth behavior in polycrystalline powder is also conducted. However, it is difficult to compute the sintering shrinkage in the phase-field approach by itself. Finally, a combined phase-field/discrete-element method is proposed to treat both grain boundary migration and sintering shrinkage, as a useful tool for mesoscale simulation.",
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