E3S Web Conf.
Volume 19, 2017International Conference Energy, Environment and Material Systems (EEMS 2017)
|Number of page(s)||6|
|Published online||23 October 2017|
AlSi21CuNi silumin modification with phosphor and strontium micro additions
Faculty of Mechanical Engineering, University of Zielona Gora, 4 Prof. Z. Szafrana Street, 65516 Zielona Gora, Poland
⁎ Corresponding author: email@example.com
The paper presents the results of investigation of the influence of AlFeP and AlSr modifiers on the structure of the hypereutectoid silumin, AlSi21CuNi. The silumin has been modified in two stages. The first stage was melt with the addition of phosphor in the quantity of 120ppm. The second stage was combined application of phosphor and strontium. The strontium addition amounted 150, 250 and 350 ppm. At each melt, the metal has been cast after 10, 30, and 60 minutes from the introduction of the modifiers. The effectiveness of the modification has been assessed basing on qualitative and quantitative analysis of the microstructure of castings. It has been determined that the applied addition of phosphor causes significant comminution of the primary silicon secretions. Maximum comminution of primary silicon has been obtained after the longest time of the modified alloy soaking. The most advantageous effects of combined modification have been obtained with the application of 120ppm addition of P and 350ppm addition of Sr after 60 minutes from the introduction of the modifiers to the metal bath.
© The authors, published by EDP Sciences, 2017
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