Effectiveness of cast iron vermicularization including 'conditioning' of the alloy

• Autorzy: Soiński M. S. , Mierzwa P.
• Języki publikacji: EN

Abstrakty

EN

The performed investigations have resulted in conclusion that the vermicularizing treatment of 'basic' cast iron, consisting in 'conditioning' the alloy by means of VLCe(2) master alloy, introducing the DENODUL5 master alloy, and graphitizing with SRF75 master alloy, provides for obtaining vermicular graphite precipitates in the structure of material cast within 15 minutes' period from the modifying treatment. The cast iron has been melted in the induction crucible furnace of medium frequency under industrial conditions. The alloy has been subjected to vermicularization in the slender ladle of 1 Mg capacity. Graphitizing has been performed in the course of transferring the cast iron from the slender ladle to the pouring ladle. A series of test coupons in the form of reversed U-blocks of test part walls 25 mm thick have been cast of the produced cast iron. Then specimens both for metallographic examination and for testing the mechanical properties have been taken from the coupons. The analysis of cast iron structure has revealed, among others, that however purely vermicular graphite precipitates occurred in specimens taken out of the lower parts of test coupon walls (which are cooled faster), the nodular graphite precipitates in quantity up to 10% could be observed in specimens from the upper parts of test coupon walls (located close beneath the sinkhead).

Słowa kluczowe

EN

vermicular cast iron; vermicularization; modification; mechanical properties; graphite precipitates

PL

żeliwo wermikularne; modyfikacja; właściwości mechaniczne; wydzielenia grafitu

• Wydawca: Komisja Odlewnictwa Polskiej Akademii Nauk Oddział w Katowicach
• Czasopismo: Archives of Foundry Engineering
• Rocznik: 2011
• Tom: Vol. 11, iss. 2
• Strony: 133--138
• Opis fizyczny: Bibliogr. 19 poz., rys., tab.

Twórcy

autor

Soiński M. S.

autor

Mierzwa P.

• Department of Foundry, Technical University of Częstochowa, ul. Armii Krajowej 19, 42-200 Częstochowa, Poland,

Bibliografia

• [1] E. Nechtelberger, Gußeisenwerkstoffe. Eigenschaften unlegierter und niedriglegierter Gusseisen mit Lamellengraphit / Kugelgraphit / Vermiculargraphit im Temperaturbereich bis 500°C. Teil 1: Textband, Teil 2: Tafelband. Teil 3: Bildband, Ed. Fachverlag Schiele & Schön, Berlin (1977).
• [2] M. S. Soiński, Studies on production of the cast iron with vermicular graphite, Mat. of Scientific Symposium "Physical and Chemical Phenomena in Foundry", Zielona Góra - Przełazy, (1994) 47-52 (in Polish).
• [3] M. S. Soiński, Investigations of crystallization of low-aluminium cast iron with nodular and vermicular graphite, Solidification of Metals and Alloys, vol. 20 (1994) 115-120 (in Polish).
• [4] S. Pietrowski, Mechanism of crystallization of vermicular graphite in cast iron, Solidification of Metals and Alloys, vol. 37 (1998) 97-104 (in Polish).
• [5] S. Pietrowski, B. Pisarek, R. Władysiak, Alloy cast iron with vermicular graphite, Solidification of Metals and Alloys, vol. 37 (1998) 105-111 (in Polish).
• [6] M. S. Soiński, T. Warchala, Production of cast iron with vermicular graphite by treating the alloy with aluminium and cerium mischmetal, Solidification of Metals and Alloys, vol. 37 (1998) 119-124 (in Polish).
• [7] E. Guzik, T. Kleingarten, A study on the structure and mechanical properties of vermicular cast iron with pearlitic-ferritic matrix, Archives of Foundry Engineering, vol. 9, issue 3 (2009) 55-60.
• [8] E. Guzik, Structure and mechanical properties as well as application of high quality vermicular cast iron, Archives of Foundry Engineering, vol. 10, issue 3 (2010) 95-100.
• [9] P. Mierzwa, The effect of thermal treatment on the selected properties of cast iron with vermicular graphite, Doctor's thesis, TU Częstochowa, Faculty of Materials Processing Technology and Applied Physics, Częstochowa (2010).
• [10] T. Warchala, Metallurgy and casting of cast iron. Part I, The structure and properties of cast iron, Ed. TU Częstochowa, Częstochowa (1988).
• [11] M. S. Soiński, T. Warchala, Cast iron for moulds for glass industry, Archives of Foundry, vol. 6, No. 19 (2006) 289-294 (in Polish).
• [12] Sorelmetal, On the nodular cast iron, Ed. Metals & Minerals Ltd, Warsaw (2006) (in Polish).
• [13] E. Guzik, Processes of cast iron refining. Selected problems, Archives of Foundry, Monograph No. 1 M, Ed. PAN, Katowice (2001) (in Polish).
• [14] C. Podrzucki, A. Wojtysiak, Plastic non-alloy cast iron. Part II, Ed. AGH, Cracow (1988) (in Polish).
• [15] T. Warchala, Metallurgy and casting of cast iron. Part II. Cast iron technology. Ed. TU Częstochowa, Częstochowa (1995) (in Polish).
• [16] Polish Standard PN-EN 1563, Founding. Spheroidal graphite cast iron, Ed. PKN (2000) (in Polish).
• [17] Polish Standard PN-EN ISO 945, Cast iron. Determining of features of graphite precipitates, Ed. PKN (1998) (in Polish).
• [18] Polska Norma PN 75/H-04661, Grey cast iron, nodular cast iron and malleable. Metallographic examinations. Determining of microstructure, Ed. PKN, (1975) (in Polish).
• [19] W. Volk, Applied statistics for engineers, Ed. WNT, Warsaw (1973) (in Polish).