Proeutectic crystallisation in hypereutectic silumins modified with Al-CuP-Me master alloys

• Autorzy: Piątkowski J.
• Języki publikacji: EN

Abstrakty

EN

Using thermal analyses TA and ATD, within a narrow range of the crystallisation period, i.e. until reaching an equilibrium temperature, the occurrence of exothermic effect was stated. Most probably, the said effect is due to a proeutectic crystallisation of \alfa phase or of \beta phase crystals. The said effect was observed to occur only in alloys after the process of modification with an addition of high-melting point elements. Complex inoculants of Al-CuP-Me (Me = Mo, Co, Cr, Nb, TiB, W) type cause hardening of silumins, due to the formation of new phases of the AlxMey type, which can act as substrates for the nucleation of \alfa dendrites and crystals of \beta phase. The experiments carried out on castings solidifying with different rates of heat transfer have proved that proeutectic crystallisation does not occur when free solidification conditions (microspheres) are provided. This fact can be related to the heat transfer rate.

Słowa kluczowe

EN

theoretical fundamentals; crystallization process; modification; proeutectic crystallisation; silumin

PL

proces krystalizacji; modyfikacja; krystalizacja proeutektyczna; silumin

• Wydawca: Komisja Odlewnictwa Polskiej Akademii Nauk Oddział w Katowicach
• Czasopismo: Archives of Foundry Engineering
• Rocznik: 2009
• Tom: Vol. 9, iss. 4
• Strony: 195--198
• Opis fizyczny: Bibliogr. 8 poz., rys., tab., wykr.

Twórcy

autor

Piątkowski J.

• Chair of Metal Alloys and Composites Engineering, Silesian University of Technology, ul. Krasińskiego 8, 40-019 Katowice, Poland,

Bibliografia

• [1] E. Fraś, Crystallisation of metals. WNT 2003 (in Polish).
• [2] S. Pietrowski, T,he solidification of metallic materials. WPŁ, Łódź 1993 (in Polish).
• [3] F. Binczyk, J. Piątkowski, Investigation of phenomena accompanying the solidification of modified AK20 silumin examined by the DTA and ATD method of analysis. IV International Conference, Kołobrzeg, 1998 (in Polish).
• [4] S. Pietrowski, Silumins. Pol. Łódzka, Łódź 2001 (in Polish).
• [5] J. Sobczak, Innovations in metalcasting. IO Kraków 2007(in Polish).
• [6] Z. Górny, J. Sobczak, Non-ferrous metals based novel materiale In foundry practice. ZA-PIS Cracow 2005 (In Polish).
• [7] H. P. Baker, Alloy Phase Diagrams. ASM International 1992.
• [8] J. Piątkowski, The phosphorus interaction on the process forming of primary structure of hypereutectic silumins. Archives of Foundry Engineering, Łódź 2009.