Abstract
A regional control constrained spray deposition model was established to study the flow fields and deposition of atomized droplets in a semienclosed space. The FLUENT software was used to simulate the changing rules of the pressure field, velocity field, and temperature field under different atomization gas pressures (AGPs), aiming to optimize the equipment and parameters of spray Conform. The results show that the flow fields are prone to be disturbed by the controller of the two rotating disks when the AGP is low, which makes it difficult to control the droplet deposition. Besides, excessive AGP will bring a robust reverse airflow, which is not conducive to control droplet deposition either. However, the outlet pressure of the diversion tube is about 2.5 × 104 Pa when the AGP is between 2.5 and 3.0 × 105 Pa. In this condition, the melt will exit the nozzle without blockage. Moreover, the pressure near the basement is about 5 × 104 Pa at this point, making the droplet deposition controllable.
Highlights
To solve the problems of energy waste and process complexity caused by reheating and densification of porous billets prepared by spray forming, a short-process composite technology of Spray Conform (SC) was proposed.1 The SC technology combines spray forming with Conform technology directly
The air velocity is slow and easy to diverge under the interference of the disks when the atomization gas pressures (AGPs) is small
The flow fields of RCCSD were simulated by FLUENT
Summary
To solve the problems of energy waste and process complexity caused by reheating and densification of porous billets prepared by spray forming, a short-process composite technology of Spray Conform (SC) was proposed. The SC technology combines spray forming with Conform technology directly. SC is a near-net-shape manufacturing technology from liquid to the finished product directly. It has the advantages of rapid solidification, extensive plastic deformation, and continuity. The segregation of alloy elements is restrained due to the fast crystallization of droplets at the atomization stage, improving the homogeneity of the composition. The deposited billet is further improved, and the density is increased by continuous angular extrusion
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