Quantitative Investigation into the Relation between Force Chains and Stress Transmission During High-Velocity Compaction of Powder

Zhang, Wei; Zhou, Jian; Zhang, Xuejie; Liu, Kun

doi:10.3938/jkps.74.660

Cited by 14 publications

(10 citation statements)

References 32 publications

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“…However, given the interaction between the lateral wall and the friction between the particles, we can confirm the anisotropy of the particle principal stress direction, and similar conclusions are reached in Ref. [44]. Meanwhile, the direction of the principal stress directly affects the evolution of the force chain, so the force chain close to the side wall will show strong directional changes.…”

Section: -6supporting

confidence: 88%

“…Thus, the relation between the side wall and all interparticle friction should be investigated further. Reference [44] identifies a strong anisotropy in the direction of the principal stress of the particles near the side wall due to the friction between the side wall and the particles. Thus, we define the direction of the force chains as being similar but not equivalent to those in previous work.…”

Section: -6mentioning

confidence: 99%

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Correlation mechanism between force chains and friction mechanism during powder compaction

Zhang

Tan

et al. 2022

Chinese Phys. B

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The relation between friction mechanism and force chains characteristics has not yet been fully studied in the powder metallurgy research area. In this work, a uniaxial compression discrete element model is established based on the compaction process of ferrous powder. Furthermore, the correlation mechanism between force chains and the friction mechanism during powder compaction is investigated. The simulation results reveal a strong correlation between the variation of the friction coefficient and the evolution of force chains. During the powder compaction, the friction coefficient would eventually tend to be stable, a feature which is also closely related to the slip ratio between particles. The side wall friction and the friction between particles would have an important effect on the direction of force chain growth in about one-third of the area near the side wall. The research results provide theoretical guidance for improving the densification process of the powder according to the force chain and friction.

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Section: -6supporting

confidence: 88%

Section: -6mentioning

confidence: 99%

Correlation mechanism between force chains and friction mechanism during powder compaction

Zhang

Tan

et al. 2022

Chinese Phys. B

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“…Al-based alloy powder was pressed by the HYP 35-2 HVC machine (Hydropulsor Company, Karlskoga, Sweden). The flowchart of this process is illustrated in our previous research [11]. The green with compaction energy 1325 J was sintered in a tube furnace with flowing high purity nitrogen (99.99 wt%).…”

Section: Methodsmentioning

confidence: 99%

“…The existence of a few residual porosities in the sintered parts remains the hurdle to get over for many applications, although the newer Al-based alloys offer main strength improvements [10]. High-velocity compaction (HVC) has greatly enhanced the density of the green body [11,12]. Z. H. Zhang et al [13] reported that the iron-base PM alloy parts with high performance and high density were obtained by the combination of HVC and powder annealing.…”

Section: Introductionmentioning

confidence: 99%

Effects of Sintering Temperature on Densification, Microstructure and Mechanical Properties of Al-Based Alloy by High-Velocity Compaction

Yuan

Yin

et al. 2021

Metals

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This present work investigates the effects of sintering temperature on densification, mechanical properties and microstructure of Al-based alloy pressed by high-velocity compaction. The green samples were heated under the flow of high pure (99.99 wt%) N2. The heating rate was 4 °C/min before 315 °C. For reducing the residual stress, the samples were isothermally held for one h. Then, the specimens were respectively heated at the rate of 10 °C/min to the temperature between 540 °C and 700 °C, held for one h, and then furnace-cooled to the room temperature. Results indicate that when the sintered temperature was 640 °C, both the sintered density and mechanical properties was optimum. Differential Scanning Calorimetry, X-ray diffraction of sintered samples, Scanning Electron Microscopy, Energy Dispersive Spectroscopy, and Transmission Electron Microscope were used to analyse the microstructure and phases.

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“…HVC has greatly enhanced the performance of green bodies [22,23,24,25,26] with various advantages, such as low ejection force, uniform density distribution, low spring back, and high density. The process of HVC was simulated using DEM (discrete element method), and the change of porosity in HVC was captured [27]. High impact energy was achieved by modifying the existing equipment, and the hydraulic control system was developed to implement automatic control of the energy produced from the disc springs [28].…”

Section: Introductionmentioning

confidence: 99%

Effects of Compaction Velocity on the Sinterability of Al-Fe-Cr-Ti PM Alloy

Yuan

Yin

et al. 2019

Materials

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In this research, the effects of the compaction velocity on the sinterability of the Al–Fe–Cr–Ti powder metallurgy (PM) alloy by high velocity compaction were investigated. The Al–Fe–Cr–Ti alloy powder was compacted with different velocities by high velocity compaction and then sintered under a flow of high pure (99.999 wt%) nitrogen gas. Results indicated that both the sintered density and mechanical properties increased with increasing compaction velocity. By increasing the compaction velocity, the shrinkage of the sintered samples decreased. A maximum sintered density of 2.85 gcm−3 (relative density is 98%) was obtained when the compaction velocity was 9.4 ms−1. The radial and axial shrinkage were controlled to less than 1% at a compaction velocity of 9.4 ms−1. At a compaction velocity of 9.4 ms−1, sintered compacts with an ultimate tensile strength of 222 MPa and a yield strength of 160 MPa were achieved. The maximum elongation was observed to be 2.6%. The enhanced tensile properties of the Al–Fe–Cr–Ti alloy were mainly due to particle boundary strengthening.

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Quantitative Investigation into the Relation between Force Chains and Stress Transmission During High-Velocity Compaction of Powder

Cited by 14 publications

References 32 publications

Correlation mechanism between force chains and friction mechanism during powder compaction

Correlation mechanism between force chains and friction mechanism during powder compaction

Effects of Sintering Temperature on Densification, Microstructure and Mechanical Properties of Al-Based Alloy by High-Velocity Compaction

Effects of Compaction Velocity on the Sinterability of Al-Fe-Cr-Ti PM Alloy

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