Abstract. This study aims to produce magnesium alloy strip with boss and rib directly from molten metal. Magnesium alloy is the lightest structural material, so it is expected to widely use for small electronic device and etc. We studied about melt drag process. Melt drag process is one of single roll strip casting process. We use model melt drag experimental device to produce rapid solidified magnesium strip with boss and rib. Substrate is used on model experimental device instead of roll to easily research shape of substrate. Diameter of boss is 5 mm, 7.5 mm and 10 mm. Height of boss is 6 mm. We revealed on this study that the experimental conditions to get good shape boss and rib, improvement substrate shape for good boss and rib, microstructure and etc..
The purpose of this study is to clarify the heat transfer coefficient between the molten magnesium alloy and roll, the temperature transition of molten metal and roll and the cooling rate of produced strip at single roll melt drag process. We applied the one dimensional heat transfer solidification analysis to melt drag process. Heat transfer coefficient was estimated from 1.42ϫ10 5 to 8.95ϫ10 4 W/m 2 · K at roll speed of 5 to 90 m/min by comparing between analysis and experimental results such as strip thickness. The molten metal temperature at roll surface was estimated that getting to 336°C from 780°C in the nozzle, and the roll surface temperature was estimated that getting to 235°C from 20°C at a roll speed of 30 m/min. The cooling rate of strip was estimated from 1.
This study was attempted to produce rapidly solidified clad strip by a melt drag process and to examine the clad strip properties. Roll speed V and cooling length L were chosen as principal producing factors. Clad strips consisting of base and overlay strips rigidly bonded with clear bonding interface are produced under the condition where roll speed V was varied from 30 to 70m/min and cooling length L was varied from 25 to 100mm. Clad strips of base and overlay strip both rapidly solidified are produced by cooling length between 75 and 100mm with a constant rolling velocity 50m/ min.
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