Calorimetric analysis of heating and cooling process of nodular cast iron

• Autorzy: Binczyk F. , Tomaszewska A. , Smoliński A.
• Języki publikacji: EN

Abstrakty

EN

The study presents the results of investigations of the thermal effects which take place during heating and cooling of samples of the nodular graphite cast iron taken from the stepped test casting of the wall thicknesses amounting to 5, 10, 15 and 20 mm. For investigations, a differential scanning calorimeter, type Multi HTC S60, was used. During heating, three endothermic effects related with pearlite decomposition, phase transformation "alpha -> ghama", and carbon dissolution in austenite were observed on a DSC diagram. During cooling, two exothermic effects related with phase transformation "ghama -> alpha¨ and pearlite formation were observed to consecutively take place on a DSC diagram. The values of the enthalpy of these processes differ and depend on the initial microstructure of the examined samples. The metallic matrix in 5 mm sample after the process of heating and cooling changes totally in favour of ferrite. The same effect, though less advanced in intensity, takes place in 10 mm sample, while in 15 and 20 mm samples the matrix constitution remains unchanged. The higher is the content of ferrite in samples, the stronger is the endothermic effect of the "alpha -> ghama" transformation and the weaker is the endothermic effect related with carbon dissolution in austenite. The total of the endothermic effects (heating) is reduced, while that of the exothermic effects (cooling) increases along with the increasing thickness of walls in a stepped test casting, from which samples for the investigations were taken.

Słowa kluczowe

EN

scanning calorimeter; temperature; heating; cooling; heat of phase transformations; pearlite; graphite

PL

kalorymetr skaningowy; temperatura; nagrzewanie; chłodzenie

• Wydawca: Komisja Odlewnictwa Polskiej Akademii Nauk Oddział w Katowicach
• Czasopismo: Archives of Foundry Engineering
• Rocznik: 2007
• Tom: Vol. 7, iss. 1
• Strony: 25--30
• Opis fizyczny: Bibliogr. 12, rys.

Twórcy

autor

Binczyk F.

autor

Tomaszewska A.

autor

Smoliński A.

• Silesian University of Technology, Chair of Metal Alloys and Composites Engineering, Krasińskiego Str. 8, 40-019 Katowice, Poland,

Bibliografia

• [1]. J. Piaskowski, A. Jankowski, Nodular cast iron, WNT, Warsaw, 1974, (in Polish).
• [2]. E. Guzik, Some selected problems concerning the processes of cast iron improvement, Archives of Foundry, No. 1M, (2001), (in Polish).
• [3]. F. Binczyk, Constructional casting alloys. Silesian Technical University, Gliwice, 2003, (in Polish)
• [4]. C. Podrzucki, Cast iron, ZG STOP, Cracow, 1991,(in Polish).
• [5]. E. Fraś, Crystallization of metals, WNT, Warsaw, 2003 (in Polish).
• [6]. L. Jincheng, R. Elliot R., The influence of cast structure on the austempering of ductile iron, Int. J. Cast Metals Res., 11, (1999), 407-412.
• [7]. L. Jincheng, R. Elliot R., The role of nodule count on the kinetics, mikrostructure and mechanical properties of austempred Mn alloyed ductile iron , Int. J. Cast Metals Res., 12, (1999), 189-195.
• [8]. D. Myszka, Structural research of direct austempered ductile irons obtaoined in sand mould, Archives of Foundry, vol.1, No. 1(2/2), (2001), 263-270,(in Polish).
• [9]. J. Tybulczuk, A. Kowalski A., Characteristic of ADI with additions of 1.5%Ni and 0.8%Cu, Foundry Research Institute, t. XLVII, No. 4, (1997), 403-440.
• [11]. F. Binczyk, R. Przeliorz, J. Furmanek, J. Kulasa, The definition of skaning kalorymetry metod the enthalpy of phase change in nodular cast iron, Archives of Foundry, No. 19, (2006), 31-36, (in Polish).
• [11]. F. Binczyk, J. Furmanek, R. Przeliorz, The definition of scanning calorymetry method the enthalpy of the phase change in al;-grey cast iron, Archives of Foundry, No. 22, (2006), 49-55, (in Polish).
• [12]. F. Binczyk, J. Piątkowski, R. Przeliorz, Determination of the temperature and enthalpy of phase change in Al-Si alloys, Archives of Foundry, No. 22, (2006), 65-71, (in Polish).