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Title:: Simulation of Atomization of HighSpeed Steel Powder Prepared by Electrode Induction Melting and Aeroatomization

Author(s):: FENG Shan; ZHANG Hao; Materials Science and Engineering, Inner Mongolia University of Technology, Hohhot 010051, China

Keywords:: numerical simulation; primary atomization; secondary atomization; highspeed steel molten flow; particle size distribution; Laval nozzle

CLC:

PACS:: TF123

DOI:: 10.7502/j.issn.1674-3962.202401016

DocumentCode:

Abstract:: Electrode induction melting gas atomization (EIGA) is an advanced powder preparation technology for producing ultra-clean, inclusion-free powders. The atomization powder preparation process involves multi-physical fields coupling, complex mechanisms make atomization difficult to achieve precise control, while numerical simulation can intuitively represent this intricate and hard-tomaster process. Based on the structural principle of the Laval nozzle, a supersonic nozzle model was constructed using the SolidWorks modeling software and imported into the computational fluid dynamics software Fluent for two-phase flow simulation. The atomization process of high-speed steel molten flow is divided into primary atomization and secondary atomization. A more accurate large eddy simulation (LES) method combined with adaptive mesh method was used to simulate the molten flow with different diameters (3, 4 and 5 mm). The primary atomization simulation was considered complete when the outlet mass flow rate tended to stabilize. For secondary atomization, a sub-model was established based on the primary atomization, and a single droplet with a particle size of 0.5 mm was extracted for simulation. The results show that the supersonic gas jet impacts and atomizes the high-speed steel molten flow. During the primary atomization process, as the diameter of the high-speed steel molten flow increases, the average particle size of the droplet group formed by its fragmentation also increases. The secondary atomization adopts a more precise mesh to capture the finer droplets generated by fragmentation and atomization. The simulation results indicate that the particle size of the droplet group is mainly distributed in the range of 50~250 μm.

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Simulation of Atomization of HighSpeed Steel Powder Prepared by Electrode Induction Melting and Aeroatomization(PDF)

MATERIALS CHINA[ISSN:1674-3962/CN:61-1473/TG]

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