scholarly journals The pressure wave analysis in high velocity compaction process

2011 ◽  
Vol 60 (12) ◽  
pp. 128101
Author(s):  
Wang Shuang ◽  
Zheng Zhou-Shun ◽  
Zhou Wen
Keyword(s):  
High Velocity ◽  
Pressure Wave ◽  
Wave Analysis ◽  
Compaction Process ◽  
High Velocity Compaction

Development of a High-Velocity Compaction process for polymer powders

2005 ◽  
Vol 24 (7) ◽  
pp. 909-919 ◽  
Author(s):  
Bruska Azhdar ◽  
Bengt Stenberg ◽  
Leif Kari
Keyword(s):  
High Velocity ◽  
Compaction Process ◽  
High Velocity Compaction ◽  
Polymer Powders

Analysis of Density and Mechanical Properties of Iron Powder with Upper Relaxation Assist through High Velocity Compaction

2013 ◽  
Vol 749 ◽  
pp. 41-46 ◽  
Author(s):  
Dil Faraz Khan ◽  
Hai Qing Yin ◽  
Matiullah Matiullah ◽  
Asadullah Asadullah ◽  
Xuan Hui Qu
Keyword(s):  
Mechanical Properties ◽  
Iron Powder ◽  
High Velocity ◽  
Testing Machine ◽  
Morphological Characteristics ◽  
Zinc Stearate ◽  
Compaction Process ◽  
Assist Device ◽  
Conservation Of Momentum ◽  
High Velocity Compaction

For producing higher density PM parts a new method, High-Velocity Compaction process with additional upper relaxation assist (URA) device is presented in the paper. Using zinc stearate as a die wall lubricant, iron powder was pressed with and without upper relaxation assist device of mass 0.14 Kg focusing to investigate the density and mechanical properties. To explain a compaction process in loading stage a conservation of momentum principle has been introduced during collision of hammer, upper piston and upper relaxation assist device in die compaction. To observe the morphological characteristics and mechanical properties, a scanning electron microscopy (SEM) and computer controlled universal testing machine were used. The experimental results showed that the samples compacted with URA device had an improved green density and mechanical properties compared to the samples compacted in the absence of URA device.

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

Metals ◽  
2021 ◽  
Vol 11 (2) ◽  
pp. 218
Author(s):  
Xianjie Yuan ◽  
Xuanhui Qu ◽  
Haiqing Yin ◽  
Zaiqiang Feng ◽  
Mingqi Tang ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
High Velocity ◽  
Sintered Density ◽  
Sintering Temperature ◽  
X Ray Diffraction ◽  
Scanning Calorimetry ◽  
X Ray ◽  
Transmission Electron ◽  
High Velocity Compaction ◽  
Sintered Temperature

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.

A Novel Framework for Pulse Pressure Wave Analysis Using Persistent Homology

2015 ◽  
Vol 22 (11) ◽  
pp. 1879-1883 ◽  
Author(s):  
Saba Emrani ◽  
T. Scott Saponas ◽  
Dan Morris ◽  
Hamid Krim
Keyword(s):  
Pulse Pressure ◽  
Pressure Wave ◽  
Persistent Homology ◽  
Wave Analysis

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

Materials ◽  
2019 ◽  
Vol 12 (18) ◽  
pp. 3005 ◽  
Author(s):  
Xianjie Yuan ◽  
Xuanhui Qu ◽  
Haiqing Yin ◽  
Zhenwei Yan ◽  
Zhaojun Tan
Keyword(s):  
Mechanical Properties ◽  
High Velocity ◽  
Alloy Powder ◽  
Sintered Density ◽  
Ti Alloy ◽  
Maximum Elongation ◽  
Nitrogen Gas ◽  
High Velocity Compaction ◽  
Ti Powder ◽  
Particle Boundary

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.

Quantitative investigation on force chain lengths during high velocity compaction of ferrous powder

2019 ◽  
Vol 33 (10) ◽  
pp. 1950113 ◽  
Author(s):  
Wei Zhang ◽  
Jian Zhou ◽  
Xuejie Zhang ◽  
Yan Zhang ◽  
Kun Liu
Keyword(s):  
High Velocity ◽  
Pearson Correlation ◽  
Quantitative Characteristic ◽  
Correlation Coefficients ◽  
High Strength ◽  
Force Chain ◽  
Force Chains ◽  
Low Probability ◽  
High Velocity Compaction ◽  
Chain Lengths

Force chains play an important role in linking the macro- and micro-mechanisms of powder in high velocity compaction (HVC). Force chain lengths, as an important quantitative characteristic, can describe the geometry of force chains. In this study, force chain lengths and their relation to other force chain characteristics in HVC were investigated by discrete element method. Results revealed that force chain length decreased and it can be related to the densification process of ferrous powder in HVC. Moreover, long force chains extended from top to bottom and may play a major role in supporting load, although the percentage of long force chains was low. Probability density functions of force chain lengths further showed the exponential decay. The proportion of short force chains increased and the proportion of long force chains decreased. Long force chains had high strength and can be aligned to the direction of the external load, but force chain lengths did not have clear relation to straightness. These relations were confirmed by Pearson correlation coefficients.

Characteristic Analysis of the Stress Propagation of Metal Powder in High Velocity Compaction Using DEM

2020 ◽  
Vol 89 (4) ◽  
pp. 044602
Author(s):  
Wei Zhang ◽  
Kun Liu ◽  
Jian Zhou ◽  
Rongxin Chen ◽  
Ning Zhang ◽  
...  
Keyword(s):  
Metal Powder ◽  
High Velocity ◽  
Characteristic Analysis ◽  
Stress Propagation ◽  
High Velocity Compaction
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