Abstract
In present study an effort has been made to investigate the effect of changing the mode of mold cavity filling on mechanical properties and microstructure of cast aluminium. The pouring of the melt in mold cavity is avoided so as to check defects associated with it and instead of pouring, counter gravity filling of mold technique is utilized. The obtained properties and microstructure are compared with gravity poured (traditionally cast) aluminium. Characterization techniques like optical microscopy, scanning electron microscopy, X-Ray diffraction and mechanical testing like tensile and hardness of the cast samples is carried out. Hardness and tensile strength reported an increment of 22.37% and 26.71% respectively as compared to traditionally cast specimens. This enhancement in mechanical properties was attributed to improved microstructure obtained.
Highlights
The demand of high strength to weight ratio materials in aerospace, automobile and other engineering applications has attracted researchers towards aluminium and its alloys (Davis, 1993)
As can be seen a graphite crucible is used for melting the metal, a hollow sprue is dipped in molten metal with its one end connected to mold cavity, a circular disc is placed on the surface of melt and is connected to rack and pinion arrangement for its up and down motion in order to apply force on the surface of melt
An attempt has been made to utilize the concept of LPDC and counter gravity casting, so as to fill mold cavity with cleanest possible melt and to study the influence of this filling technique of mold during casting, on the mechanical properties and microstructure of produced aluminium casting
Summary
The demand of high strength to weight ratio materials in aerospace, automobile and other engineering applications has attracted researchers towards aluminium and its alloys (Davis, 1993). They offer several superior properties such as low weight, high strength, corrosion resistant, formability and machining (Surappa and Rohatgi, 1981). Campbell (2004) stated that aluminium casting through gravity pouring (traditional method) is considered as a challenging task due to the occurrence of defects like porosity and shrinkage and other defects due to turbulence. Pouring of molten metal in cavity is considered as a prime factor causing these defects and the quality of the final products in terms of its microstructure and properties are compromised, the cause of these defects needs to be addressed (Campbell, 2012).
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