Ultrasonic treatment of molten metal can greatly improve the properties of castings, especially the microstructure and mechanical properties. Recently, the proprietary ultrasonic technology has been used to improve the technology, providing significant benefits for industrial continuous casting, providing an alternative method of argon degassing, replacing the standard alloy mother liquor additives, and greatly improving the microstructure. Here, we will explore the mechanism of ultrasonic liquid metal interaction, especially how they are applied to ultrasonic degassing and grain refinement. Finally, we will briefly introduce the application of our ultrasonic technology in industrial continuous casting. Applied to liquids including water and liquid metals, ultrasonic energy can induce cavitation: the formation of steam microbubbles caused by rapid energy changes. When the pressure drops below the saturated vapor pressure of liquid phase, the bubble or cavity will appear, and then collapse or implode rapidly under high pressure, resulting in shock wave and dissipating a lot of energy.
When there is a nucleation center, cavitation will be enhanced; Usually these centers are microbubbles and impurities. In casting aluminum and its alloys, the presence of hydrogen (usually in the form of atoms) can lead to porosity problems in the final product. In order to overcome this problem, degassing process is usually used. One method is to inject inert gas such as argon into the melt to form bubbles, and hydrogen diffuses into the bubbles to form hydrogen molecules.
Some results.
Improve the mixing of metals, grain refinement and new alloys. Excellent ultrasonic degassing effect (removing debris and wetting inclusions). Reduce the friction between tools (such as casting, drawing, extrusion, molding). Improve surface treatment.