Calorimetric and Mössbauer spectroscopy examinations of ADI

• Autorzy: Binczyk F. , Hanc A. , Kowalski A.
• Języki publikacji: EN

Abstrakty

EN

The study presents a new approach to the mechanism of isothermal transformation in ADI. The discussion was based on the results of calorimetric analysis of the thermal effects that take place in the specimen when heated after austempering and on the results of analysis of the phase composition of cast iron examined by Mössbauer spectroscopy. The examinations were carried out on specimens taken from casting of 60 mm diameter subjected to austempering at 280, 330 and 380 °C. Upon heating, on the DSC diagram, a strong exothermic effect of about 20 °C range was observed to take place (it was not observed in the common cast iron), and its beginning, depending on the austempering temperature, fell to the range of 469 to 490 °C. The heat of this effect was proportional to the austenite content in matrix. The Mössbauer examination of phase composition in a specimen "frozen" from 650 °C revealed the decay of austenite and the appearance of products of its decomposition, i.e. [alpha]3 ferrite and Fe2,4C type carbides. So, it has been concluded that the exothermic effect present upon heating of cast iron during austempering (and due to the decomposition of austenite) should correspond to the endothermic effect due to the energy absorption necessary for carbon to be "retained" in [gamma]st austenite during stage I of the transformation [...].

Słowa kluczowe

EN

Mössbauer spectroscopy; scanning calorimetric; austenite; ferrite; carbides

PL

spektroskopia Mössbauera; kalorymetria skaningowa; austenit; ferryt; węglik

• Wydawca: Komisja Odlewnictwa Polskiej Akademii Nauk Oddział w Katowicach
• Czasopismo: Archives of Foundry Engineering
• Rocznik: 2008
• Tom: Vol. 8, iss. 4
• Strony: 9--14
• Opis fizyczny: Bibliogr. 13 poz., rys., tab.

Twórcy

autor

Binczyk F.

autor

Hanc A.

autor

Kowalski A.

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

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] D. Myszka, Structural research of direct austempered ductile irons obtained in sand mould, Archives of Foundry, vol.1, No. 1(2/2), (2001), 263-270 (in Polish).
• [5] F. Binczyk, R. Przeliorz, J. Furmanek, J. Kulasa, The definition of scanning calorimetric method the enthalpy of phase change in nodular cast iron, Archives of Foundry, No. 19, (2006), 31-36 (in Polish).
• [6] F. Binczyk, J. Furmanek, R. Przeliorz, The definition of scanning calorimetric method the enthalpy of the phase change in al;-grey cast iron, Archives of Foundry, No. 22, (2006), 49-55 (in Polish).
• [7] F. Binczyk, J. Furmanek, A. Smoliński, Calorimetric examinations of austempered ductile iron ADI, Archives of Foundry Engineering, Vol. 7, Issue 4, (2007). pp. 5-8.
• [8] A. K. Sinha, Physical metallurgy handbook. The McGraw-Hill Companies, Inc. (2003).
• [9] Z. Nishiyama, Martensitic transformation. Academic Press, edited by M.E. Fine, M. Meshii, C.E. Wayman, 1978.
• [10] A. Oleś, The methods of solid-state physics. Issue 2, WNT, Warszawa (1998) (in Polish).
• [11] A. Hrynkiewicz, D. Kuglawczuk, Mössbauer Spectroskopy, Geologiy Publ., Warsaw (1988) (in Polish).
• [12] F. Binczyk, A. Hanc, A. Kowalski, Austempering transformation kinetics of ADI iron obtained by Mössbauer Spectroscopy, Archives of Foundry Engineering, vol. 8, Issue 3, (2008), pp.15-21.
• [13] Mosce Ron, Iron-Carbon and Iron-Nitrogen Systems, in "Applications of Mossbauer Spectroscopy", volume II, Edited by Richard L. Cohen, Academic Press, (1980).