Application of Differential Scanning Calorimetry (DSC) in study of phase transformations in ductile iron

• Autorzy: Przeliorz R. , Piątkowski J.
• Języki publikacji: EN

Abstrakty

EN

The effect of heating rate on phase transformations to austenite range in ductile iron of the EN-GJS-450-10 grade was investigated. For studies of phase transformations, the technique of differential scanning calorimetry (DSC) was used. Microstructure was examined by optical microscopy. The calorimetric examinations have proved that on heating three transformations occur in this grade of ductile iron, viz. magnetic transformation at the Curie temperature, pearlite→austenite transformation and ferrite→austenite transformation. An increase in the heating rate shifts the pearlite→austenite and ferrite→austenite transformations to higher temperature range. At the heating rate of 5 and 15°C/min, local extrema have been observed to occur: for pearlite→austenite transformation at 784°C and 795°C, respectively, and for ferrite→austenite transformation at 805°C and 821°C, respectively. The Curie temperature of magnetic transformation was extrapolated to a value of 740°C. Each transformation is related with a specific thermal effect. The highest value of enthalpy is accompanying the ferrite→austenite transformation, the lowest occurs in the case of pearlite→austenite transformation.

Słowa kluczowe

EN

crystallisation process; inoculation; ductile iron; scanning calorimetry DSC

PL

krystalizacjia; żeliwo sferoidalne; kalorymetria skaningowa DSC

• Wydawca: Komisja Odlewnictwa Polskiej Akademii Nauk Oddział w Katowicach
• Czasopismo: Archives of Foundry Engineering
• Rocznik: 2010
• Tom: Vol. 10, iss. 2
• Strony: 135--140
• Opis fizyczny: Bibliogr. 15 poz., rys., tab., wykr.

Twórcy

autor

Przeliorz R.

• Silesian University of Technology, Chair of Materials Technology, Krasińskiego 8, 40-019 Katowice, Poland

autor

Piątkowski J.

• Silesian University of Technology, Chair of Materials Technology, Krasińskiego 8, 40-019 Katowice, Poland

Bibliografia

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