Thermal Shock Resistance of Cast Iron with Various Shapes of Graphite Precipitates

• Autorzy: Jakubus A. , Soiński M. S.

Identyfikatory

DOI

10.24425/122513

• Języki publikacji: EN

Abstrakty

EN

The influence of a shape of graphite precipitates in cast iron on the thermal shock resistance of the alloy was initially determined. Investigations included the nodular cast iron and the vermicular one, as well as the cast iron containing flake graphite. The thermal shock resistance was examined at a special laboratory stand which allowed for multiple heating and cooling of specimens within the presumed temperature range. The specimens were inductively heated and then cooled in water of constant temperature of about 30°C. There were used flat specimens 70 mm long, 5 mm thick in the middle part, and tapering like a wedge over a distance of 15 mm towards both ends. The total length of cracks generated on the test surfaces of the wedge-shaped parts of specimens was measured as a characteristic value inversely proportional to the thermal shock resistance of a material. The specimens heated up to 500°C were subjected to 2000 test cycles of alternate heating and cooling, while the specimens heated up to 600°C underwent 1000 such cycles. It was found that as the heating temperature rose within the 500-600°C range, the thermal shock resistance decreased for all examined types of cast iron. The research study proved that the nodular cast iron exhibited the best thermal shock resistance, the vermicular cast iron got somewhat lower results, while the lowest thermal shock resistance was exhibited by grey cast iron containing flake graphite.

Słowa kluczowe

EN

cast iron; graphite precipitates; thermal shock

PL

żeliwo; wydzielenia grafitu; szok termiczny

• Wydawca: Komisja Odlewnictwa Polskiej Akademii Nauk Oddział w Katowicach
• Czasopismo: Archives of Foundry Engineering
• Rocznik: 2018
• Tom: Vol. 18, iss. 2
• Strony: 121--124
• Opis fizyczny: Bibliogr. 9 poz., rys., tab., wykr.

Twórcy

autor

Jakubus A.

• The Jacob of Paradies University in Gorzów Wielkopolski, ul. Teatralna 25, 66-400 Gorzów Wielkopolski, Poland

autor

Soiński M. S.

• The Jacob of Paradies University in Gorzów Wielkopolski, ul. Teatralna 25, 66-400 Gorzów Wielkopolski, Poland

Bibliografia

• [1] Kosowski, A. (1967). Thermal shock resistance of cast iron. Przegląd Mechaniczny (Mechanical Review). 24, 747-749. (in Polish).
• [2] Wojciechowski, A., Sobczak, J. (2001). Composite brake discs of road vehicles. Warsaw: Motor Transport Institute. (in Polish).
• [3] Weroński, A. (1983). Thermal fatigue of metals. Warsaw: WNT. (in Polish).
• [4] Grochal, T., Jaśkowiec, K., Pytel, A. (2012). A device to test the thermal fatigue of metallic materials. Modern materials resistant to thermal fatigue. Part 1. General problems. Institute of Foundry. Cracow. pp. 98 - 108. (in Polish).
• [5] Wróbel. J. (2013). Thermal fatigue resistance of austempered ductile iron (ADI). Unpublished doctoral dissertation, AGH University of Science and Technology. Cracow. (in Polish).
• [6] Polish Standard PN-EN 1563:12. (2012). Founding. Spheroidal graphite cast irons.
• [7] Polish Standard PN-EN ISO 945-1: Microstructure of cast irons. Part 1. Graphite classification by visual analysis. November 2009. Correction PN-EN ISO 945-1:2009/AC. April 2010.
• [8] Polish Standard PN-75/H-04661: Grey cast iron, nodular cast iron and malleable. Metallographic examinations. Determining of microstructure.
• [9] Soiński, M.S. & Warchala, T. (2006). Cast iron moulds for glassmaking industry. Archives of Foundry. 6(19), 289-294. (in Polish).

Uwagi

PL

Opracowanie rekordu w ramach umowy 509/P-DUN/2018 ze środków MNiSW przeznaczonych na działalność upowszechniającą naukę (2018).