Effects of slit runner width on microstructure and mechanical properties of the A357 aluminums alloy castings were investigated by designing different width of the runner

FEM simulation analysis and tensile testing.The results indicate that the solid phase is solidified nearby the heat exchange interface

and gradually transferred to the core area due to effect of interface heat transfer.Segregated shrinkage metallurgical defects can be observed as a result of the feeding distance of slit runner when the ratio of slit runner width with casting wall-thickness is low

however

in turn

lots of oxide inclusions and shrinkage porosities can be generated under influence of critical pressure of the cross section and extraction at the end of the solidification process.The peak value of tensile strength

yield strength and elongation can be presented when the proportionality coefficient between slit runner width and thickness size of casting is set to 1.2

where their reach 342 MPa

310MPa and 9.4%

respectively

and the fracture morphology is characterized by dimple fracture mechanism.