TY - JOUR N2 - In this work, T-shaped mould design was used to generate hot spot and the effect of Sr and B on the hot tearing susceptibility of A356 was investigated. The die temperature was kept at 250o C and the pouring was carried out at 740o C. The amonut of Sr and B additions were 30 and 10 ppm, respectively. One of the most important defects that may exist in cast aluminium is the presence of bifilms. Bifilms can form by the surface turbulence of liquid metal. During such an action, two unbonded surfaces of oxides fold over each other which act as a crack. Therefore, this defect cause many problems in the cast part. In this work, it was found that bifilms have significant effect over the hot tearing of A356 alloy. When the alloy solidifies directionally, the structure consists of elongated dendritic structure. In the absence of equiaxed dendrites, the growing tips of the dendrites pushed the bifilms to open up and unravel. Thus, leading to enlarged surface of oxide to become more harmful. In this case, it was found that these bifilms initiate hot tearing. L1 - http://www.czasopisma.pan.pl/Content/104602/PDF/afe-2017-0151.pdf L2 - http://www.czasopisma.pan.pl/Content/104602 PY - 2017 IS - No 4 DO - 10.1515/afe-2017-0151 KW - A356 KW - Casting KW - Melt quality KW - Grain refinement KW - hot tearing A1 - Uludağ, M. A1 - Çetin, R. A1 - Dışpınar, D. PB - The Katowice Branch of the Polish Academy of Sciences VL - vol. 17 DA - 2017 T1 - Observation of Hot Tearing in Sr-B Modified A356 Alloy UR - http://www.czasopisma.pan.pl/dlibra/publication/edition/104602 T2 - Archives of Foundry Engineering ER -