Effects of radiator shapes on the bubble diving and dispersion of ultrasonic argon process

Xuan Liu; Jilai Xue; Qiang Zhao; Qichi Le; Zhiqiang Zhang

doi:10.1016/j.ultsonch.2017.10.026

Effects of radiator shapes on the bubble diving and dispersion of ultrasonic argon process

Ultrason Sonochem. 2018 Mar:41:600-607. doi: 10.1016/j.ultsonch.2017.10.026. Epub 2017 Nov 5.

Authors

Xuan Liu¹, Jilai Xue², Qiang Zhao², Qichi Le³, Zhiqiang Zhang⁴

Affiliations

¹ School of Metallurgical and Ecological Engineering, University of Science and Technology Beijing, Beijing 100083, People's Republic of China. Electronic address: xuanliu@ustb.edu.cn.
² School of Metallurgical and Ecological Engineering, University of Science and Technology Beijing, Beijing 100083, People's Republic of China.
³ Key Lab of Electromagnetic Processing of Materials, Ministry of Education, Northeastern University, Shenyang 110819, People's Republic of China. Electronic address: qichil@mail.neu.edu.cn.
⁴ Key Lab of Electromagnetic Processing of Materials, Ministry of Education, Northeastern University, Shenyang 110819, People's Republic of China.

PMID: 29137792
DOI: 10.1016/j.ultsonch.2017.10.026

Abstract

In this work, three ultrasonic radiators in different shapes have been designed in order to investigate the effects of radiator shapes on the argon bubble dispersion and diving as well as the degassing efficiency on magnesium melt. The radiator shape has a strong influence on the bubble diving and dispersion by ultrasound. A massive argon bubble slowly flows out from the radiator with the hemispherical cap, due to the covering hemispherical cap. Using a concave radiator can intensively crush the argon bubbles and drive them much deep into the water/melt, depending on the competition between the argon flow and opposite joint shear force from the concave surface. The evolution of wall bubbles involves the ultrasonic cavities carrying dissolved gas, migrating to the vessel wall, and escaping from the liquid. Hydrogen removal can be efficiently achieved using a concave radiator. The hydrogen content can be reduced from 22.3 μg/g down to 8.7 μg/g. Mechanical properties are significantly promoted, due to the structure refinement and efficient hydrogen removal.

Keywords: Hydrogen removal; Magnesium melt; Mechanical properties; Radiator shape; Ultrasonic argon process.