科研之友
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摘要
High performance Cu-Al composites have widely applied in aviation, aerospace and other fields, at the same time the continuous casting as one of composite forming technologies has been also developed in recent years. Obviously, it is an effective and cheap way to numerically simulate the solidification process of short process continuous casting for manufacturing Cu-Al composites before fabricating them. To meet the need of simulation, in this work, a numerical method for theoretically describing the Cu-Al composite forming in continuous casting processes was proposed. The vertical continuous casting of copper clad aluminum bar billet and the horizontal continuous casting of copper and aluminum composite plate were performed. Based on this method, the steady state temperature fields in solidification processes in the above two kinds of casting technologies were numerically simulated by using pro-CAST software package. In this work the effects of the theoretical parameters on the steady state temperature fields and then on the performance of Cu-Al composites fabricated by using the above two casting technologies were carefully discussed. It is found that the experimental and simulated results are in good agreement. For the cases of the copper clad aluminum bar billet with a cross section of 100 mmx 100 mm, and the copper or aluminum plate with a thickness of 20 mm and a width of 75 mm (coat thicknesses of 4 similar to 7 mm), the feasible parameters for producing high performance Cu-Al composites, for examples, are as follows: for the former the temperature of copper liquid is 1250 degrees C, the temperature of aluminum liquid is 750 degrees C, the length of crystallizer is 200 mm, the length of graphite mandrel tube is 290 mm, the flux of the first cooling water is 1600 similar to 2000 L/h, the flux of the second cooling water is 900 similar to 1300 L/h, the distance from the second cooling water to the exit of crystallizer is 30 mm, and the withdrawing speed is 60 similar to 80 mm/min. For the latter the temperature of copper melt was 1250 degrees C, the temperatures of aluminum melt are 760 similar to 800 degrees C, the withdrawing speed is 40 similar to 80 mm/min, and the length of aluminum duct is 20 mm.
- 出版日期2018-3-11
- 单位北京科技大学
