The Crystallization of the AlSi9 Alloy Designed for the Alfin Processing of Ring Supports in Engine Pistons

• Autorzy: Piatkowski J.

Identyfikatory

DOI

10.24425/afe.2020.131304

• Języki publikacji: EN

Abstrakty

EN

This article presents a study of the crystallization and microstructure of the AlSi9 alloy (EN AC-AlSi9) used for the alfin processing of iron ring supports in castings of silumin pistons. Alfin processing in brief is based on submerging an iron casting in an Al-Si bath, maintaining it there for a defined time period, placing it in a chill mould casting machine and immersing it in the alloy. This technology is used for iron ring supports in the pistons of internal combustion engines, among others. Thermal analysis shows that when the AlSi9 alloy contains a minimal content of iron, nucleation and increase in the triple α (Al)+Fe+(Si) eutectic containing the α -Al₈Fe₂Si phase takes place at the end of the crystallization of the double α (Al)+ß(Si) eutectic. Due to the morphology of the ”Chinese script” the -Al8Fe2Si phase is beneficial and does not reduce the alloy’s brittleness. After approx. 5 hours of alfin processing, the -Al₅FeSi phase crystallizes as a component of the α+Al₅FeSi+(Si) eutectic. Its disadvantageous morphology is ”platelike” with sharp corners, and in a microsection of the surface, ”needles” with pointed corners are visible, with increases the fragility of the AlSi9 alloys.

Słowa kluczowe

EN

Al-Si cast alloy; alfin processing; crystallization; microstructure alloys

• Wydawca: Komisja Odlewnictwa Polskiej Akademii Nauk Oddział w Katowicach
• Czasopismo: Archives of Foundry Engineering
• Rocznik: 2020
• Tom: Vol. 20, iss. 2
• Strony: 65--70
• Opis fizyczny: Bibliogr. 7 poz., rys., tab., wykr.

Twórcy

autor

Piatkowski J.

• Silesian University of Technology, Faculty of Materials Science, Katowice, Poland
• Federal-Mogul Gorzyce A Tenecco Group Company Pistons, Gorzyce, Poland

Bibliografia

• [1] Acar, A.F., Ozturk, F. & Bayrak, M. (2010). Effect of variations in alloy content and machining parameters on the strength of the intermetallic bonding between a diesel piston and a ring carrier. Materials and Technology. 44(6), 391-395. DOI: 621.436 UDK.
• [2] Manasijevic, S., Dolic, N., Djurdjevic, M., Misic, N. & Davitkov, N. (2015). The intermetallic bonding between a ring carrier and aluminum piston alloy. Revista de Metalurgia. 51(3), 1-7. DOI: 10.3989/revmetalm.048.
• [3] Manasijevic, S. & Radisa, R. (2015). Al-Fin Bond in Aluminum Piston Alloy & Austenitic Cast Iron Insert. International Journal of Metalcasting. 9(4), 27-32. DOI: 10.1007/BF03356037.
• [4] Szajnar, J., Wróbel, T., Dulska, A. (2017). Manufacturing methods of alloy layers on casting surfaces. Journal of Casting and Materials Engineering. 1(1), 2-6. DOI: ORG/ 10.7494/jcme.2017.1.1.2.
• [5] Xinjin, Cao & Campbell, J. (2006). Morphology of -Al5FeSi phase in Al-Si cast alloy. Material Transactions 47, 1303-1312. DOI: 10.2320/matertrans.47.1303.
• [6] Report from assignment no 4500314245 commissioned by the Federal-Mogul Gorzyce Tenecco Company. (unpublished materials, in Polish).
• [7] Yoshiaki Osawa, Susumu Takamori, Takashi Kimura, Kazumi Minagawa and Hideki Kakisawa (2007) Morphology of intermetallic compounds in Al-Si-Fe alloy and its control by ultrasonic vibration. Materials Transactions. 48(9), 2467-2475. DOI: 102320/matertrans.F-MRA2007874.

Uwagi

PL

Opracowanie rekordu ze środków MNiSW, umowa Nr 461252 w ramach programu "Społeczna odpowiedzialność nauki" - moduł: Popularyzacja nauki i promocja sportu (2020).