The silumin coat structure on alloy ductile iron

• Autorzy: Szymczak T.
• Języki publikacji: EN

Abstrakty

EN

The work presents the research results of the silumin coat structure applied on the carbidic alloy ductile iron with the metal matrix: pearlitic, bainitic and martensitic. The coats were made in the AlSi5 silumin bath at the temperature t_k = 750±5ºC. The holding time of cast iron element in the bath was \tau = 180s. Irrespective of the kind of tested ductile iron the obtained coat consisted of three layers with a different phase composition. The first layer from the cast iron ground “g₁” is built from Fe₄CSi carbide which contains selected alloy additives of the cast iron. On it the second layer “g₁” crystallizes. It consists of the AlFeSi inter-metallic phase which can appear in its pure form or contain a small quantity of the alloy additives of the cast iron. The last external part of the layer “g₂” mainly consists of the hypo-eutectic phases of silumin. The AlFeSi inter-metallic phases in the form of free precipitations with a lamellar or faceted morphology can also appear there. These phases also can contain a small quantity of the alloy additives of the cast iron. More than that, in all the layers of the coat there are graphite precipitations. The phenomenon of graphite movement to the coat is caused by intensive dissolving of the cast iron element surface by the aluminum of the silumin bath.

Słowa kluczowe

EN

innovative casting technologies; dip coats; alloy ductile iron; silumin

PL

innowacyjne technologie odlewnicze; żeliwo sferoidalne; silumin

• Wydawca: Komisja Odlewnictwa Polskiej Akademii Nauk Oddział w Katowicach
• Czasopismo: Archives of Foundry Engineering
• Rocznik: 2013
• Tom: Vol. 13, iss. 1
• Strony: 119--124
• Opis fizyczny: Bibliogr. 8 poz., rys., tab., wykr.

Twórcy

autor

Szymczak T.

• Department of Materials Engineering and Production Systems, Technical University of Łódź, Stefanowskiego 1/15 Street, 90-924 Łódź, Poland

Bibliografia

• [1] Pietrowski S., Szymczak T. (2008) The structure of the alphinizing coat on alloy steels, Archives of Foundry Engineering, vol. 8, issue 4.
• [2] Pietrowski S., Szymczak T. (2010) Alfinated coating structure on HS6-5-2 (SW7M) high speed steel, Archives of Foundry Engineering, vol. 10, issue 4.
• [3] Szymczak T. (2012) The structure of the silumin coat on alloy cast steels, Archives of Foundry Engineering, vol. 12, issue 2/2012.
• [4] Malkiewicz T. (1976) Metal science of iron-base alloy, PWN, Warzszawa-Kraków (in Polish).
• [5] Dobrzański L. (2006) Engineering materials and material planning, WNT, Warszawa (in Polish).
• [6] Szymczak T. (2007) Model of coat increase on iron alloys hot dip obtained in Al-Si bath and its connection with multicomponent silumins, PhD Thesis, Technical University of Łódź, (in Polish).
• [7] Pietrowski S., Szymczak T. (2007) Effect of silicon concentration in bath on the structure and thickness of grey cast iron coating after alphinising, Archives of Materials Science and Engineering, vol. 28, issue 7.
• [8] Pietrowski S., Szymczak T. (2011) Theoretical Basis of Al-Si Coat Crystallization on Gray and Nodular Cast Iron and Making the Layered Items Using It, Journal of Achievements in Materials and Manufacturing Engineering, vol. 49, issue 2.