TY - JOUR N2 - The paper concerns the problem of discontinuity in high pressure die castings (HPDC). The compactness of their structure is not perfect, as it is sometimes believed. The discontinuities present in these castings are the porosity as follow: shrinkage and gas (hydrogen and gas-air occlusions) origin. The mixed gas and shrinkage nature of porosity makes it difficult to identify and indicate the dominant source. The selected parameters of metallurgical quality of AlSi9Cu3 alloy before and after refining and the gravity castings samples (as DI - density index method), were tested and evaluated. This alloy was served to cast the test casting by HPDC method. The penetrating testing (PT) and metallographic study of both kinds of castings were realized. The application of the NF&S simulation system allowed virtually to indicate the porosity zones at risk of a particular type in gravity and high-pressure-die-castings. The comparing of these results with the experiment allowed to conclude about NF&S models validation. The validity of hypotheses concerning the mechanisms of formation and development of porosity in HPDC casting were also analyzed. L1 - http://journals.pan.pl/Content/88531/PDF/26_paper.pdf L2 - http://journals.pan.pl/Content/88531 PY - 2015 IS - No 1 DO - 10.1515/afe-2015-0026 KW - Al-Si alloys KW - Gravity and high-pressure-die-castings KW - Microstructure KW - Gas and shrinkage porosity KW - Process virtualization KW - Complementary model validation A1 - Ignaszak, Z. A1 - Hajkowski, J. PB - The Katowice Branch of the Polish Academy of Sciences DA - 2015[2015.01.01 AD - 2015.12.31 AD] T1 - Contribution to the Identification of Porosity Type in AlSiCu High-Pressure-Die-Castings by Experimental and Virtual Way UR - http://journals.pan.pl/dlibra/publication/edition/88531 T2 - Archives of Foundry Engineering ER -