Abstract
The main aim of the study was to determine the effect of two different refinement methods on EN AW-Al99,5 primary structure and development of the refinement mechanism. The first method consisted of inoculation with a small amount of (Ti+B) according to PN-EN 573-3 standard and the second one consisted of employing an electromagnetic field during the aluminum crystallization process. These structure refinement methods are particularly important in continuous and semi-continuous casting where products are used for plastic forming. The large columnar crystal zone results in reduction of the extrusion rate on presses; moreover, during the ingot rolling delamination of external layers may occur.
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