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The effect of ultrasonic degassing on the quality and properties of components produced by low and high pressure die casting

Authors:
  • Österreichisches Giesserei Institut, Austrian Foundry Research Institute
  • Österreichisches Gießerei-Institut (ÖGI), Austria, Leoben

Abstract

Introducing ultrasound in molten aluminium is known to be an efficient means of melt degassing without the need to use expensive gases and rotating parts. In this paper the performance of ultrasonic degassing with regard to the quality and tensile properties of cast parts is compared with conventional Ar rotary degassing for two common casting techniques, low-pressure and high-pressure die casting. A significant reduction in dross formation is observed after the ultrasonic degassing treatment than after the conventional Ar rotary degassing. The mechanical properties and porosity level of components produced by low pressure die casting and high pressure die casting after both degassing techniques are determined. The results show that the components produced after ultrasonic degassing have similar tensile properties and porosity level as the components degassed with the conventional Ar rotary degassing.
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