A study of hydrogen bubble growth during ultrasonic degassing of Al–Cu alloy melts

Meidani, A.R. Naji; Hasan, Mainul

doi:10.1016/j.jmatprotec.2003.11.012

Cited by 52 publications

(21 citation statements)

References 11 publications

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“…As the ultrasonic cavitation intensity increases, the transient cavitation intensity gradually increases, while the proportion of steady cavitation gradually weakens. A large negative pressure in the bubble could promote free hydrogen into the bubble when the cavitation bubble expands [24]. The hydrogen is combined into H 2 and restrained in the bubble.…”

Section: Influence Mechanism Of Ultrasonic Cavitation On Pore Behaviomentioning

confidence: 99%

Study on Pores in Ultrasonic‐Assisted TIG Weld of Aluminum Alloy

Chen

Yang

et al. 2017

Metals

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Ultrasonic-assisted tungsten inert gas welding was carried out on a thin plate of 2195 Al-Li alloy, and the characteristics of the weld pores were analyzed in terms of their size and porosity. The effects of welding speed and ultrasonic power on the porosity and size of the pores were investigated. The pores were found to occur primarily adjacent to the surface of the weld. The porosity decreased and the size increased with a decrease in welding speed. The effect of ultrasonic power on the characteristics of the pores was different from that of the welding speed. The porosity and size of the pores decreased and then increased with an increase in ultrasonic power. A relationship was found between the transient cavitation intensity and the characteristics of pores. An increasing transient cavitation intensity results in a decrease in the porosity and size of pores when the transient cavitation intensity is lower. However, it can result in an increase in the porosity and pore size when the transient cavitation intensity further increases. Finally, the influencing mechanism of cavitation on welding pores was discussed.

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Section: Influence Mechanism Of Ultrasonic Cavitation On Pore Behaviomentioning

confidence: 99%

Study on Pores in Ultrasonic‐Assisted TIG Weld of Aluminum Alloy

Chen

Yang

et al. 2017

Metals

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“…R. Naji Maidani et al had studied hydrogen bubble growth during ultrasonic degassing of Al-Cu alloy melts [5] . The mathematical model developed by them for bubble dynamics is the driving force behind the ultrasonic degassing technology.…”

Section: International Journal Of Research In Advance Engineering (Ijmentioning

confidence: 99%

“…In the region of minimum pressure, cavitations occur in the melt, and fine bubbles are produced. The bubbles produced during cavitations could provide nuclei for hydrogen bubbles to coalesce and flow out of the melt [5,10,12,16,19] . However, very little work has been reported on the application of ultrasonic energy to the degassing of aluminum alloy melts.…”

Section: Introductionmentioning

confidence: 99%

Ultrasonic Treatment to Molten FEM©™ Aluminum Alloy and Effects of Ultrasound Treatment Melt Temperature on Porosity

Mavani¹,

Bhojak²,

Bhatt³

2015

IJRAE

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Today, in the industry of aluminum, the D. C. casting of billets and slabs is playing the major role. The producers of these slabs and billets are many. The end users of the product are OEMs. The degassing technology for producing these aluminum slabs and billets is provided by very few.There are two types of degassing methods currently in use. One of these, vacuum degassing, is used primarily in the steel industry and thus not generally used in the aluminum industry. The second method, generally employed in the aluminum industry, is rotary degassing, which uses finely dispersed argon, chlorine, fluorine to remove dissolved hydrogen and various salts from melt.The challenges associated with producing aluminum are reducing porosity due to hydrogen precipitation during casting through degassing processes; which generates detrimental effects on mechanical properties of alloy castings and removing impurities like; the Ca, Mg salts etc. from the molten metal.Looking at the degassing systems provided by these players, are going to be obsolete as the environment norms will become stricter in the next decade, because of the use of Fluorine and Chlorine for removing the Ca, Mg, etc. impurities from the molten metal as the ozone layer is getting depleted and process becomes more cumbersome and hazardous.So, the innovation in the technology is needed; which leads research interest on development of the ultrasonic degassing as a better option.During This research paper should underpin improvement in the process and hence improved hardness of material by elimination of the fluorine and chlorine usage by replacing it with ultrasonic technology with suitable mechanical design, metallurgical criteria and thermal analysis consideration.During the entire research and development authors had carried out various operations like Research on thermal and metallurgical behavior of the molten metal and alloys, Comparison of results achieved using ultrasonic technique over existing technique, Formulation of conclusion; making ultrasonic technique a proven technology, and Identifying the further scope of research and development.With the experiments carried out, authors found significant improvement in hardness of the material produced by ultrasonic degassing as compared with the hardness of material produced by conventional degassing.

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“…Ultrasonic waves produce cavitation phenomena in liquids and the creation, growth and collapse of bubbles, that can also generate very high impact forces; these ones have a dynamic role during the nucleation because the high pressures fragment the rising crystals, by breaking dendritic structures and by increasing the nucleation centres [5], while the acoustic flow induces a vigorous stirring of the bath, homogenizing the alloy. Cavitations phenomena originate also a rapid development of hydrogen bubbles, causing their following coalescence and flotation on the liquid metal surface and, therefore, promoting the alloy degassing [4,6].…”

Section: Introductionmentioning

confidence: 99%

Effect of ultrasound treatment of AlSi5 liquid alloy on corrosion resistance

Arrighini¹,

Gelfi²,

Pola³

et al. 2010

Materials & Corrosion

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The application of power ultrasound to liquid alloys can be a simple and cost effective method to induce both degassing and grain refinement in a single step, without the need of inert gas or inoculants additions. \ud In this paper the treatment of liquid hypoeutectic AlSi5 alloy by ultrasound waves and its effects on microstructure were investigated. \ud The corrosion behaviour of ultrasound treated samples were compared to that of non treated ones by means of immersion and electrochemical tests.\ud It was observed that the ultrasound treated alloy offers better quality, higher mechanical properties and improved corrosion resistance, as a consequence of a more uniform distribution of the solute

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A study of hydrogen bubble growth during ultrasonic degassing of Al–Cu alloy melts

Cited by 52 publications

References 11 publications

Study on Pores in Ultrasonic‐Assisted TIG Weld of Aluminum Alloy

Study on Pores in Ultrasonic‐Assisted TIG Weld of Aluminum Alloy

Ultrasonic Treatment to Molten FEM©™ Aluminum Alloy and Effects of Ultrasound Treatment Melt Temperature on Porosity

Effect of ultrasound treatment of AlSi5 liquid alloy on corrosion resistance

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