Investigating the Microscopic Mechanism of Ultrasonic-Vibration-Assisted-Pressing of WC-Co Powder by Simulation

The ultrasonic-vibration-assisted pressing process can improve the fluidity and the uneven distribution of density and particle size of WC-Co powder. However, the microscopic mechanism of ultrasonic vibration on the powder remains unclear. In this paper, WC particles with diameter 5 μm and Co partic...

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Bibliographic Details
Published in:	Materials 2023-07, Vol.16 (14), p.5199
Main Authors:	Chen, Yuhang, Wang, Yun, Huang, Lirong, Su, Binbin, Yang, Youwen
Format:	Article
Language:	eng
Subjects:	Amplitudes Cemented carbides Computer simulation Density Diameters Discrete element method Finite element method finite element simulation Investigations Mathematical models Particle size Physical properties Powder metallurgy Powders pressed billet density Pressing Residual stress Simulation Software Stress distribution Three dimensional models Tungsten carbide Ultrasonic transducers Ultrasonic vibration ultrasonic-vibration-assisted pressing process Vibration Vibration analysis Viscosity WC-Co powder
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Summary:	The ultrasonic-vibration-assisted pressing process can improve the fluidity and the uneven distribution of density and particle size of WC-Co powder. However, the microscopic mechanism of ultrasonic vibration on the powder remains unclear. In this paper, WC particles with diameter 5 μm and Co particles with diameter 1.2 μm were simulated by three-dimensional spherical models with the aid of the Python secondary development. At the same time, the forming process of the powder at the mesoscale is simulated by virtue of the finite element analysis software ABAQUS. In the simulation process, the vibration amplitude was set to 1, 2, and 3 μm. Their influence on the fluidity, the filling density, and the stress distribution of WC-Co powder when the ultrasonic vibration was applied to the conventional pressing process was investigated. The simulation results show that the ultrasonic vibration amplitude has a great influence on the density of the compact. With an increase in the ultrasonic amplitude, the compact density also increases gradually, and the residual stress in the billet decreases after the compaction. From the experimental results, the size distribution of the billet is more uniform, the elastic after-effect is reduced, the dimensional instability is improved, and the density curves obtained by experimentation and simulation are within a reasonable error range.
ISSN:	1996-1944 1996-1944