Effect of Degassing Treatment on the Quality of Al-7Si and A356 Melts

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  • Huang Li-Wu
    Department of Mechanical Engineering National Central University
  • Wang Pi-Wein
    Department of Mechanical Engineering National Central University
  • Shih Teng-Shih
    Department of Mechanical Engineering National Central University
  • Liou Jenq-Hwu
    Department of Mechanical Engineering Chien Kuo Institute of Technology

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Abstract

In melting aluminum alloys, inclusion particles suspended in melt can be effectively reduced by floatation and/or sedimentation. Nevertheless, few researchers have focused on the effect of degassing bubbles on inclusion particles entrapped in the Al melt and the poured casting as well. The degassed bubbles evolved from a diffuser, floated up and collapsed on free surface of the melt. After explosion, the splashed droplets dropped on surface and then sank into melt following the movement of convection loop induced near the free surface of melt. Consequently, after degassing treatment, Al–7Si melts increased the inclusion particle counts and foggy marks revealing on the section of chilled samples. The A356.2 melts decreased the inclusion particle counts but increased the foggy marks on the poured chilled samples.

Journal

  • MATERIALS TRANSACTIONS

    MATERIALS TRANSACTIONS 43 (11), 2913-2920, 2002

    The Japan Institute of Metals and Materials

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