Evaluation of selected parameters of pressure casting on the structure of silumin AlSi9Cu3

The article presents the results of investigations of the effect of selected casting parameters on the structure of casts made under high pressure by means of the casting machine produced by BÜHLER, type H630-B, out of the AlSi9Cu3 alloy from the EN AB-46000 group, with varying parameters of the piston operation. The investigations were performed on appropriately prepared specimen sampled from casts of an armchair back bracket. For the evaluation of the cast structure a scanning electron microscope was used, whose EDS software allows for determining the composition of the alloy with the consideration of the distribution of the elements. Also, measurements of the cast hardness and the structure component microhardness were performed. After a series of tests, evaluation of the structure of the microsections of the samples of casts made with varying casting parameters, during phase II and III of the pressure casting process, was performed. It was established that, at low piston rates, larger precipitations crystallize, which were characterized by very high hardness. Increasing the piston rate causes refinement of the product structure; however, decreasing the pressure of intensification of phase III leads to a drop of the cast hardness.

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