Effect of Ultrasonic Bending Vibration Introduced by the L-shaped Ultrasonic Rod on Solidification Structure and Segregation of Large 2A14 Ingots

In order to achieve long-term and stable ultrasonic treatment in the direct chill semi-continuous casting process, a new L-shaped ceramic ultrasonic wave guide rod is designed to introduce ultrasonic bending vibration into 2A14 aluminum alloy melt. The effect of ultrasonic bending vibration on the solidification structure and composition segregation of large 2A14 aluminum alloy ingots (φ 830 mm × 6000 mm) in the process of semi-continuous casting were studied by means of a direct reading spectrometer, scanning electron microscope, metallographic microscope, and hardness test. The ultrasonic ingot treated by bending vibration was compared with the ingot without ultrasonic treatment and the ingot treated by the traditional straight-rod titanium alloy wave guide rod. The results show that, during the solidification of 2A14 aluminum alloy, ultrasonic treatment can significantly refine the grain, break up the agglomerated secondary phase, and make its distribution uniform. The macro-segregation degree of solute including the negative segregation at the edge of the ingots and the positive segregation in the center can be reduced. Through comparative analysis, the macrostructure of the ingot, treated by the L-shaped ceramic ultrasonic wave guide rod, was found to be better than that of the ingot treated by the traditional straight-rod titanium alloy wave guide rod. In particular, the grain refinement effect at the edge of the ingot was the best, the secondary phase was smaller, more solute elements can be dissolved into the α-Al matrix, and the ability of the L-shaped ultrasonic wave guide rod to restrain segregation was stronger at the edge of the ingot.

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Effects of Ultrasonic Bending Vibration Introduced by an L-Shaped Ultrasonic Rod on the Microstructure and Properties of a 1060 Aluminum Alloy Strip Formed by Twin-Roll Casting

Materials ◽

10.3390/ma13092013 ◽

2020 ◽

Vol 13 (9) ◽

pp. 2013 ◽

Cited By ~ 1

Author(s):

Chen Shi ◽

Gaofeng Fan ◽

Xuqiang Mao ◽

Daheng Mao

Keyword(s):

Aluminum Alloy ◽

Continuous Casting ◽

Cold Rolling ◽

Ultrasonic Energy ◽

Alloy Strip ◽

Bending Vibration ◽

Microstructure And Properties ◽

Rolling Strip ◽

Twin Roll ◽

Addition Amount

In order to achieve the industrial application of ultrasonic energy in the continuous casting and rolling production of aluminum alloy, a new type of L-shaped ultrasonic rod was used to introduce an ultrasonic bending vibration into the aluminum melt in the launder during the horizontal twin-roll continuous casting and rolling process of a 1060 aluminum alloy. The effects of the ultrasonic bending vibration on the microstructure and properties of the 1060 aluminum alloy cast rolling strip and its subsequent cold rolling strip were studied experimentally, and the effect of the ultrasonic-assisted refining with different amounts of Al-Ti-B refiner was explored. The results show that under the same addition amount of Al-Ti-B refiner, the ultrasonic bending vibration can refine the grains of the cast rolling strip, make the distribution of precipitates more uniform, reduce the slag inclusion defects, and improve the mechanical properties to a certain extent. The microstructure and properties of the ultrasonic cast rolling strip with 0.18 wt% Al-Ti-B refiner or 0.12 wt% Al-Ti-B refiner are better than those of the conventional cast rolling strip, but the microstructure and properties of the ultrasonic cast rolling strip with 0.09 wt% Al-Ti-B refiner are slightly worse than those of the conventional cast rolling strip. Moreover, after cold rolling, the effect of the ultrasonic bending vibration on the improvement of the microstructure and properties of the aluminum alloy strip is inherited. A comprehensive analysis shows that the use of ultrasonic energy in this paper cannot completely replace the effect of the Al-Ti-B refiner, but it can reduce the addition amount of the Al-Ti-B refiner by 1/3.

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Effect of Ultrasonic Treatment on Microstructure and Properties of Aluminum Alloy Rod Prepared by Continuous Casting and Rolling

Springer Proceedings in Physics - Physics and Engineering of Metallic Materials ◽

10.1007/978-981-13-5944-6_7 ◽

2019 ◽

pp. 65-72

Author(s):

Nan Zhou ◽

Shuncheng Wang ◽

Zhimin Zhang ◽

Yuanhui Zhai ◽

Guangyao Zhong

Keyword(s):

Aluminum Alloy ◽

Continuous Casting ◽

Ultrasonic Treatment ◽

Microstructure And Properties

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Simulation of Microstructures in Solidification of Continuous Casting Aluminum Alloy Thin Strip

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.399-401.1750 ◽

2011 ◽

Vol 399-401 ◽

pp. 1750-1754

Author(s):

Shou Dong Chen ◽

Jing Chao Chen ◽

Lian Hao Lv

Keyword(s):

Aluminum Alloy ◽

Continuous Casting ◽

Solidification Process ◽

Solidification Structure ◽

Thin Strip ◽

Metal Solidification ◽

Casting Aluminum Alloy ◽

Casting Aluminum ◽

Twin Roll ◽

Kinetics Of

Based on the research on the solidification of twin-roll continuous casting aluminum alloy thin strip, the analytical model of heterogeneous nucleation, the growth kinetics of tip (KGT) of twin-roll continuous casting aluminum alloy thin strip solidification are established by means of the principle of metal solidification, meantime based on the cellular automaton, the emulational model of twin-roll continuous casting aluminum alloy thin strip solidification is established. The foundation for the emulational simulation of twin-roll continuous casting thin strip solidification structure is laid. Meanwhile has confirmed the mathematical simulation feasibility by using the solidification process of twin-roll continuous casting aluminum alloy Thin Strip.

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