Pengaruh Perbedaan Temperatur Cetakan Logam Terhadap Fluiditas dan Struktur Mikro MG-44%AL

Abstract

Lenght of fluidity is one of important factor that give influence on thin wall casting. The increasing lenght of fluidity will increase feeding ability molten metal. At the thin wall mould, the cooling rate temperature move rapidly and then increasing solidification rate cast metal. The aim of the research is studiying optimal mould temperature on Mg-44%Al casting process. Gravity methode is used as this casting. The mould was made by machining process. Molten metal was pouring on 650^oC, 700 ^oC and 750 ^oC into difference mould temperature (650^oC, 700^oC and 750 ^oC). The mould has difference thickness 0,5 mm; 1mm; 1,5 mm; 2 mm; 2,5 mm; 3 mm; 3,5 mm;dan 4 mm. The maximum length of fluidity at mould temperature 200^oC on pouring temperature 700^oC. Each of mould temperature, Increasing lenght of fluidity untill mould temprature 650^oC and 700^oC but decreasing lenght of fluidity after pouring temperatur 750^oC, at all difference mould temperatures.