scholarly journals Simulation and Experiment of New Ultrasonic Vibration Network

2020 ◽  
Vol 2020 ◽  
pp. 1-12
Author(s):  
Xiwen Chen ◽  
Xiaoqian Li ◽  
Weihua Gui ◽  
Luca Landi
Keyword(s):  
Aluminum Alloy ◽  
Power Spectrum ◽  
Frequency Spectrum ◽  
Ultrasonic Vibration ◽  
Spectrum Efficiency ◽  
Vibration Source ◽  
Aluminum Alloy Casting ◽  
Alloy Casting ◽  
Average Grain Size

A reasonable ultrasonic vibration network can improve the casting quality of aluminum alloy. Ultrasonic vibration network based on a honeycomb structure has been designed, referred to as a new vibration network. The new vibration network can solve the problems of nonuniform distribution of power ultrasonic wave, small working area and low volume of ultrasonic vibration network, low efficiency of the frequency spectrum and power spectrum, and poor quality of aluminum alloy casting. The number of vibration nodes can be determined based on the number of layers of the vibration source nodes. The edge length of regular hexagonal honeycomb cells can be determined based on the size of the casting ingot. The output power and resonant frequency of the ultrasonic vibration network can be adjusted in real time according to the status of aluminum alloy melt. A seven-node new ultrasonic network and a four-node ultrasonic network with a traditional structure were selected and used in the experiment and simulation of a 500 mm diameter 2219 aluminum alloy ingot. In comparison with the traditional four-node ultrasonic network, the effective volume and area, frequency spectrum efficiency, and comprehensive coverage probability of the seven-node new ultrasonic vibration network increased by 34.06%, 23.12%, 17.25%, and 0.308, respectively. The difference between the desired value and average efficiency of the power spectrum was 0.292 W/cm2, and the average grain size of aluminum alloy decreased by 34.98 microns. These results indicate that the efficiency of ultrasonic-vibration-assisted casting system and the quality of aluminum alloy casting can be improved using the new ultrasonic vibration network.

Improvement of 319 aluminum alloy casting durability by high temperature solution treatment

2001 ◽  
Vol 109 (1-2) ◽  
pp. 174-180 ◽  
Author(s):  
Jerry H Sokolowski ◽  
Mile B Djurdjevic ◽  
Christopher A Kierkus ◽  
Derek O Northwood
Keyword(s):  
Aluminum Alloy ◽  
High Temperature ◽  
Solution Treatment ◽  
High Temperature Solution ◽  
Aluminum Alloy Casting ◽  
Alloy Casting ◽  
Temperature Solution

Solidification and Microstructure Simulation of A356 Aluminum Alloy Casting

2021 ◽  
Vol 1033 ◽  
pp. 18-23
Author(s):  
Li Tong He ◽  
Yi Dan Zeng ◽  
Jin Zhang
Keyword(s):  
Aluminum Alloy ◽  
Solidification Process ◽  
Casting Process ◽  
Uniform Structure ◽  
A356 Aluminum Alloy ◽  
Aluminum Alloy Casting ◽  
Alloy Casting ◽  
Shrinkage Defects ◽  
A356 Aluminum ◽  
Filling And Solidification

To obtain an A356 aluminum alloy casting with a uniform structure and no internal shrinkage defects, ProCAST software is used to set different filling and solidification process parameters for an A356 aluminum alloy casting with large wall thickness differences, And multiple simulations are conducted to obtain optimized casting process; then, based on the process, the microstructure of the thickest and thinnest part of the casting are simulated. The size, morphology, and distribution of the simulated microstructure of the thinnest part and the thickest part of the casting are very similar. The simulated microstructure is similar to that of the actual casting. This shows that castings with uniform structure and no internal shrinkage defects can be obtained through the optimized casting process .

scholarly journals Microstructure and Its Influence on the Welding Quality of 6063 Aluminum Alloy Porthole Die Extrusion

Materials ◽  
2021 ◽  
Vol 14 (21) ◽  
pp. 6584
Author(s):  
Shikang Li ◽  
Luoxing Li ◽  
Zhiwen Liu ◽  
Guan Wang
Keyword(s):  
Aluminum Alloy ◽  
Dynamic Recrystallization ◽  
Welding Quality ◽  
3D Numerical Modeling ◽  
Porthole Die ◽  
Average Grain Size ◽  
The Matrix ◽  
6063 Aluminum Alloy ◽  
Ram Speed

Extrusion experiments and 3D numerical modeling were conducted to investigate the dynamic recrystallization and welding quality of a 6063 aluminum alloy hollow square tube extruded by a porthole die at the ram speeds of 3 mm/s, 7 mm/s, 9 mm/s and 11 mm/s. The results showed that average grain size of hollow square tube extruded at the ram speed of 7 mm/s was the smallest. The profile extruded at the ram speed of 3 mm/s exhibited the highest expansion ratio. Dynamic recrystallization (DRX) fractions were highly variable at different ram speeds. DRX fractions in the matrix zones were higher than those in the welding zones, resulting in smaller grain sizes in the matrix zones. Mechanical properties in the welding zones and matrix zones was different. A local strain concentration would occurred during expansion, which would affect the welding quality. Finally, it was found that the uniform microstructure near the welding line would also affect the welding quality.

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