Abstract
During design of the casting products technology, an important issue is a
possibility of prediction of mechanical properties resulting from the
course of the casting solidification process. Frequently there is a need
for relations describing mechanical properties
of silumin alloys as a function of phase refinement in a structure and a
porosity fraction, and relations describing phase refinement
in the structure and the porosity fraction as a function of solidification
conditions. The study was conducted on castings of a 22 mm thick plate,
made of EN AC-AlSi7Mg0,3 alloy in moulds: of quartz sand, of quartz sand
with chill and in permanent moulds. On the basis of cooling curves, values
of cooling rate in various casting parts were calculated. The paper also
presents results of examination
of distance between arms in dendrites of a solid solution α (DASL),
precipitations length of silicon in an eutectic (DlSi) and gas-shrinkage
porosity (Por) as a function of cooling rate. Statistical relations of
DASL, DlSi, Por as a function of cooling rate and statistical
multiparameter dependencies describing mechanical properties (tensile
strength, yield strength, elongation) of alloy as a function of DASL, DlSi
and Por are also presented in the paper.
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