Influence of Structure on the Thermophisical Properties of Thin Walled Castings

• Autorzy: Górny M. , Lelito J. , Kawalec M. , Sikora G.
• Języki publikacji: EN

Abstrakty

EN

This study addresses the effect of the cooling rate and of titanium additions on the thermophysical parameters of thin-walled compacted graphite iron (TWCGI) castings. Various molding materials were used (silica sand and insulating sand LDASC- Low-Density Alumina-Silicate Ceramic) to achieve different cooling rates. Different titanium additions were caused by various amount of Ferro Titanium. The research work was conducted for thin-walled iron castings with a 3-mm wall thickness. The tested material represents the occurrence of graphite in the shape of flakes (C and D types, according to the ISO Standard), nodules or compacted graphite with a percent of nodularity and different shape factor. Thermal conductivity has been determined by the laser flash technique in a temperature range of 22-600°C. The results show that the cooling rates together with the titanium content largely influence the graphite morphology and finally thermal conductivity of thin walled iron castings.

Słowa kluczowe

EN

solidification process; thin walled casting; graphite morphology; thermal diffusivity; specific heat; thermal conductivity

PL

proces krzepnięcia; odlew cienkościenny; morfologia grafitu; dyfuzyjność termiczna; ciepło właściwe; przewodność cieplna

• Wydawca: Komisja Odlewnictwa Polskiej Akademii Nauk Oddział w Katowicach
• Czasopismo: Archives of Foundry Engineering
• Rocznik: 2015
• Tom: Vol. 15, iss. 2 spec.
• Strony: 23--26
• Opis fizyczny: Bibliogr. 16 poz., tab., wykr.

Twórcy

autor

Górny M.

• AGH University of Science and Technology, Faculty of Foundry Engineering, Department of Engineering of Cast Alloys and Composites, Reymonta 23, 30–059 Krakow, Poland

autor

Lelito J.

• AGH University of Science and Technology, Faculty of Foundry Engineering, Department of Foundry Processes Engineering, Reymonta 23, 30–059 Krakow, Poland

autor

Kawalec M.

• AGH University of Science and Technology, Faculty of Foundry Engineering, Department of Engineering of Cast Alloys and Composites, Reymonta 23, 30–059 Krakow, Poland

autor

Sikora G.

• AGH University of Science and Technology, Faculty of Foundry Engineering, Department of Engineering of Cast Alloys and Composites, Reymonta 23, 30–059 Krakow, Poland

Bibliografia

• [1] Górny, M. & Kawalec, M. (2013). Role of Titanium in Thin Wall Vermicular Graphite Iron Castings Production. AFE. 13(2), 25-28.
• [2] Guesser, W., Schroeder, T. & Dawson, S. (2001). Production experience with compacted graphite iron automotive components, AFS Trans. 109, 1-11.
• [3] Dawson, S. (2009). Compacted graphite iron – a material solution for modern diesel engine cylinder blocks and heads. China foundry. 6(3), 241-246.
• [4] Holmgren, D., Kallbom, R. & Svensson, I.L. (2007). Influences of the Graphite Growth Direction on the Thermal Conductivity of Cast Iron. Metall. Mater. Trans. A. 38(2), 268-275.
• [5] Helsing, J. & Grimvall, G. (1991). Thermal Conductivity of Cast Iron : Models and Analysis of Experiments. J. Appl. Phys. 70(3), 1198-1206.
• [6] Rukadikar. M.C. & Reddy, G. P. (1986). Influence of chemical composition and microstructure on thermal conductivity of alloyed pearlitic flake graphite cast irons. J. Mater. Sci. 21(12), 4403-4410.
• [7] Holmgren, D. (2005). Review of thermal conductivity of cast iron. Int. J. Cast Metal Res. 18(6), 331-345.
• [8] Hecht, L., Dinwiddie, R.B. & Wang, H. (1999). The effect of graphite flake morphology on the thermal diffusivity of grey cast irons used for automotive brake discs. Mater. Sci. 34(19), 4775-4781.
• [9] Górny, M. & Kawalec, M. (2013). Effects of Titanium Addition on Microstructure and Mechanical Properties of Thin-Walled Compacted Graphite Iron Castings. J. Mater. Eng. Perform. 22(5), 1519-1524.
• [10] Górny, M., Kawalec, M., Sikora, G. & Lopez, H. (2014). Effect of Cooling Rate and Titanium Additions on Microstructure of Thin-Walled Compacted Graphite Iron Castings. ISIJ Int. 54(10), 2288-2293. DOI: http://dx.doi.org /10.2355/isijinternational.54.2288.
• [11] Riposan, I., Chisamera, M., Kelley, R., Barstow, M. & Naro, R.L. (2003). Magnesium-Sulfur Relationships in Ductile and Compacted Graphite Cast Irons as Influenced by Late Sulfur Additions. AFS Trans. 111, 869-883.
• [12] Holtzer, M., Górny, M., Dańko R. (2015). „Phenomena Model on the Mold/Casting Interface In Microstructure and Properties of Ductile Iron and Compacted Graphite Iron Castings-The Effects of Mold Sand/Metal Interface Phenomena”. Cham – Heidelberg – New York – Dordrecht – London: Springer.
• [13] Górny, M., Dańko, R. & Holtzer, M. (2015). The effects of the metal temperature and wall thickness on flake graphite layer in ductile iron. Metalurgija. 54(1), 11-14.
• [14] Górny, M., Kawalec, M. & Sikora, G. (2014). Effect of Cooling Rate on Microstructure of Thin-Walled Vermicular Graphite Iron Castings. AFE. 14Sp.(1), 139-142.
• [15] Holmgren, D. (2005). Review of thermal conductivity of cast iron. Int. J. Cast Metal Res. 18(6), 331-345.
• [16] ISO 16112:2006, “Compacted graphite cast irons - Classification”, I.S.O. Standardization, 2006.