Selected Aspects of Nitrogen Refinement of Silumin 226

Open access


The work presents the results of the investigations of the effect of the nitrogen (N2) refining time „τraf” and the gas output on the course of the crystallization process, the microstructure and the gassing degree of silumin 226 used for pressure casting. The refinement of the examined silumin was performed with the use of a device with a rotating head. The crystallization process was examined by way of thermal analysis and derivative analysis TDA. The performed examinations showed that the prolongation of the N2 refining time causes a significant rise of the temperature of the crystallization end of the silumin, „tL”, as well as a decrease of its gassing degree, „Z”. An increase of the nitrogen output initially causes an increase of the temperature „tL” and a drop of the gassing degree „Z”, which reach their maximal values with the output of 20 dm3/min. Further increase of the output causes a decrease of the value „tL” and an increase of „Z”. The examined technological factors of the refining process did not cause any significant changes in the microstructure of silumin 226.

[1] Pietrowski, S. (2001). Silumins. Łódź: Publishing house of Lodz University of Technology.

[2] Pietrowski, S., Walczak, W., Władysiak, R. & Pisarek, B. (2011). Possibilities of obtaining and controlling high-quality pressure castings. Archives of Foundry Engineering. 11(3), 125-142.

[3] Rapiejko, C., Pisarek, B., Czekaj, E. & Pacyniak, T. (2014). Analysis of the Crystallization of AZ91 Alloy by Thermal and Derivative Analysis Method Intensively Cooled in Ceramic Shell. Archives of Foundry Engineering. 14(1), 97-102.

[4] Gumienny, G. (2011). TDA method application to austenite transformation in nodular cast iron with carbides assessment. Archives of Foundry Engineering. 11(3), 159-166.

[5] Pietrowski, S., Pisarek, B., Władysiak, R., Gumienny, G. & Szymczak, T. (2009). TDA curves of metal alloys and the control of their quality. In Szajnar J. Advances in Theory and Practice Foundry (pp. 345-377). Katowice – Gliwice: PAN (in Polish).

[6] Pisarek, B.P. (2013). Model of Cu-Al-Fe-Ni Bronze Crystallisation. Archives of Foundry Engineering. 13(3), 72-79.

[7] Kacprzyk, B., Szymczak, T., Gumienny, G. & Klimek, L. (2013). Effect of the Remelting on Transformations in Co-Cr-Mo Prosthetics Alloy. Archives of Foundry Engineering. 13(3), 47-50.

Archives of Foundry Engineering

The Journal of Polish Academy of Sciences

Journal Information

CiteScore 2016: 0.42

SCImago Journal Rank (SJR) 2016: 0.192
Source Normalized Impact per Paper (SNIP) 2016: 0.316


All Time Past Year Past 30 Days
Abstract Views 0 0 0
Full Text Views 83 80 4
PDF Downloads 28 26 4