MODELING OF DROPLET DYNAMIC AND THERMAL HISTORIES DURING SPRAY FORMING .3. ANALYSIS OF SPRAY SOLID FRACTION

Research output: Contribution to journalArticle

Author(s)

  • P S GRANT
  • B CANTOR

Department/unit(s)

Publication details

JournalActa metallurgica et materialia
DatePublished - Mar 1995
Issue number3
Volume43
Number of pages9
Pages (from-to)913-921
Original languageEnglish

Abstract

The complex equations governing droplet dynamic and thermal behaviour during spray forming have been analysed to give an approximate expression for the spray solid fraction as a function of the process parameters of the form

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where upsilon(gi) is the initial gas velocity at atomisation, M is the molten alloy mass flow rate, Delta T is the molten alloy super heat above the liquidus, and z is the axial distance. This expression provides an extremely convenient relationship to indicate the variation of spray solid fraction during spray forming, which is a key variable controlling final as sprayed billet microstructure. Predicted N-2 atomised Al-4 wt%Cu spray solid fractions based upon the analytical expression have been compared with equivalent results obtained from a detailed computer model described previously in Parts I and II under a wide range of conditions of upsilon(gi), M, Delta T and z and gave good agreement. Best-fit values of alpha(1), alpha(2) and alpha(3) were 1.9 x 10(-1),-1.4 x 10(-3) and 1.3 x 10(-3) respectively, in good agreement with predicted values.

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