Experimental and numerical investigation of densification behaviors during powder compaction

Lei, Yu; Yan, Shiwei; Huang, Sheng; Wei, Liu; Sun, Shiming; Zhou, Miaolei; Feng, Fan

doi:10.1299/jamdsm.2018jamdsm0022

Cited by 13 publications

(8 citation statements)

References 22 publications

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“…It's slightly lower than our final relative density. Lei et al [24] investigated the density' characteristic of the gas atomized Fe powders in conventional powder compaction. They found that the final relative density is about 0.95 when the compression force is up to 40 kN.…”

Section: Characterization Of Packing Structurementioning

confidence: 99%

“…Although the densification of powder is widely investigated by 3D, the 2D simulation also can be used to capture the densification of powder in a cross section and reveals the evolution of densification and mechanical characteristics [23,24]. Olsson et al [23] investigated the process of cold powder compaction by 2D DEM model.…”

Section: Introductionmentioning

confidence: 99%

“…They found that 2D model can capture mechanical behavior in powder compaction accurately. Lei et al [24] investigated the densification behaviors during powder compaction by 2D multi-particle finite element model. They pointed out that 2D model provides a feasible method to capture the evolution of density in powder compaction.…”

Section: Introductionmentioning

confidence: 99%

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Numerical investigation into the densification of ferrous powder in high velocity compaction

et al. 2020

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The densification of ferrous powder in high velocity compaction (HVC) is numerically captured by using discrete element method. Macro property (porosity), micro properties (coordination number (CN), radial distribution function (RDF) and unbalanced force), and meso properties (force chains and their orientations) are characterized and analyzed. The effect of force chains on the densification mechanism is studied. The densification in HVC is reciprocating in accordance with the evolution of local porosity and CN. This phenomenon can be promoted by the peak of unbalanced force. The number of peaks in RDF changes from three to four during densification. In addition, force chains evolve from top to bottom and then move in reverse. The distribution of force chains is related to the CN evolution, and the degree of densification is affected by the force chain strength. Force chains can promote densification by pushing particles and squeezing adjacent particles.

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Section: Characterization Of Packing Structurementioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Numerical investigation into the densification of ferrous powder in high velocity compaction

et al. 2020

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“…A. Lu et al [24] modeled the cold isostatic pressing (CIP) process of Al powders by using MPFEM to study the effects of initial packing structures on the packing densification. Yu Lei et al [25] used the MPFEM for densification analysis for three different initial packing structures (hexagonal, tetragonal, and random) and the numerical results were compared with experimental data. The simulation results of MPFEM for a random packing structure showed a good agreement with the experimental results and can give insight into the particle-level densification mechanism in physical compaction tests.…”

Section: Introductionmentioning

confidence: 99%

Study the densification behavior and cold compaction mechanisms of solid particles-based powder and spongy particles-based powder using a multi-particle finite element method

Korim

2020

Mater. Res. Express

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Powders could be based on solid particles or spongy particles depending on the powder manufacturing procedures. In this article, the numerical study of the cold compaction process for copper solid particles-based powder (i.e. Cu solid powder) and spongy particles-based powder (i.e. Cu sponge powder) has been carried out by using a two-dimensional multi-particle finite element method (2D-MPFEM) based on single action die compaction. The effects of internal pores content, external pressure, initial packing structure on the packing densification were systematically presented. Relative density, stress distribution, internal pore deformations, and force chain movements, particle rearrangement, and interfacial behavior within spongy particles were characterized and analyzed. The results reveal that the densification behavior of the sponge powder depends basically on the internal pore's content. Moreover, at low and medium relative density (ρ <0.95), the densification behavior of the sponge powder is faster than solid particles-based powder. However, at higher relative density near unity, the force required to cause further compaction is significantly larger in the sponge powder. In addition, from the microscopic analysis, the deformation behavior of the particles and the internal pores and the force chain development rely mostly on the structure configuration, internal pore content and its position.Recently, powder metallurgy (PM) becomes an appealing process technology for both advanced and traditional materials [1]. The PM technique is competitive with conventional metallurgical manufacturing methods such as casting, forging, and machining. Moreover, it has distinctive merits such as high production rate and near-netshape forming for complex geometrical shapes, special metals, alloys with high melting points, and porous structures. In addition, it can be considered cost-effective, materials saving, easy operation, and environmentfriendly mechanism [2]. Thus, PM techniques have a lot of applications that can be used in the areas of materials, marine industries, aeronautics, astronautics, and automotive parts [3]. Powder cold compaction is one of the major stages of PM production processes that plays a key role. Through the compaction, loose powders are compressed into a cohesive and dense state using tools such as compression punches and dies [4]. The powder compact structure resulting from the powder cold compaction affects the sintering process and the properties of the final product. Therefore, any optimization of the powder compaction process requires a deep understanding of the relations between the influential factors and the densification behaviors during the powder compaction process. Consequently, a large variety of physical and numerical studies have been carried out in this regard.It is very complicated for physical experiments to characterize parameters and properties of the green compacts such as the evolution of stress distribution and local relative density and plasticity and elasticity phenomena [5]. ...

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“…The temperature evolution and densification behaviors have important influence on the powder compaction process (Yan et al, 2017, Lei et al, 2018. Moreover, sintering is an essential process for achieving necessary properties including higher mechanical strength, enhanced sintering densification, homogeneous density distribution and preferable alloying performance.…”

Section: Introductionmentioning

confidence: 99%

Numerical and experimental investigation of sintering deformation of brazing powder compacts

Yan

Lei

Zhou

et al. 2018

JAMDSM

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A modified sintering model was presented to analyze the deformation behaviors of brazing powder compact throughout the whole sintering process, both the thermal-mechanical plastic deformation and metallic alloying were implemented as sintering driving forces in the numerical simulation by the sintering model. Ag-Cu-Sn brazing powder compacts were prepared by electromagnetic compaction technique and sintered at different temperature, the simulated deformations were in reasonable agreement with the experimental deformations. Deformation analysis with different relative density was conducted by the sintering model to reveal the volume expansion mechanism and volume shrinkage mechanism throughout the whole sintering process, it was indicated that the sintering warpage or cracks are prominently related to relative density gradients, and the higher relative density of brazing powder compacts is beneficial to sintering densification. At last, the deformation behaviors of brazing powder compacts with three typical shapes were numerically predicted to provide guidelines for tool design and sintering process optimization.

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Experimental and numerical investigation of densification behaviors during powder compaction

Cited by 13 publications

References 22 publications

Numerical investigation into the densification of ferrous powder in high velocity compaction

Numerical investigation into the densification of ferrous powder in high velocity compaction

Study the densification behavior and cold compaction mechanisms of solid particles-based powder and spongy particles-based powder using a multi-particle finite element method

Numerical and experimental investigation of sintering deformation of brazing powder compacts

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