科研之友
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摘要
Since the invention of spray forming by Prof. Singer in the early 80's, many researchers have attempted to explain the rapid solidification features of the spray deposit through mathematical modelling of the process. The break-up of the stream into atomized drops followed by the deposition of these semi-solid droplets into a rotating deposit have been simulated using both the energy and the momentum equations. These models, however, do not explain the fineness of structure observed in spray formed products when compared to cast structures of similar dimensions and experiencing similar cooling rates. A single fluid technique provides an ideal tool to study the effect of atomization variables on the structure evolution of a spray formed deposit. It will be shown based on Cu-6Sn, Al-Cu and Al-Fe alloys that the undercooling of second and subsequent phases in the deposit accounts for the rapid solidified structure in spray forming.
- 出版日期2010-7
