Utilization of thermal analysis to thermo physical properties study of real steel grades

• Autorzy: Klus P. , Zaludova M , Gryc K. , Smetana B. , Michalek K. , Dobrovska J. , Tkadleckova M. , Socha L.
• Języki publikacji: EN

Abstrakty

EN

Purpose: This paper deals with determining the temperatures of phase transformations in real steel grades. It also includes the study of industrially produced steel grades using the methods of thermal analysis by experimental equipment STA 449 F3 Jupiter made by NETZSCH and Setsys 18TM made by SETARAM. Design/methodology/approach: Selected methods of thermal analysis (DSC and DTA) enable to obtain the temperatures of phase transformations taking place in steel during the linear heating/cooling. Within the casting technology of steel, thermal analysis is used to determine the solidus temperature and especially the crucial liquidus temperature. Findings: Experimentally obtained solidus and liquidus temperatures are higher in the DSC method (max. 3.8°C). The difference between the temperatures of phase transformation (T) running between the solidus temperature (TS) and liquidus (TL) for both methods (DTA and DSC) differ by a maximum of 3.2°C. The results from experimental measurements were compared with theoretical calculations of liquidus and solidus temperatures by different authors and with the computed results from thermodynamic database COMPUTHERM and also with temperatures from the equilibrium phase diagram of Fe-Cr-C. Experimentally obtained solidus temperatures are lower than the calculated equilibrium solidus temperatures. Experimentally obtained liquidus temperatures are in the range of temperatures obtained using computational relations. The temperatures mentioned in the equilibrium phase diagram (diagram for a particular steel grades was not found) are higher than experimentally obtained temperatures. Research limitations/implications: The results of experimental studies can be used to refine the knowledge of basic physical properties of steel and for example replacement of the tabulated values or estimated values of phase transformation temperatures and thermal capacity. Furthermore, the obtained data will be implemented in the material databases of numerical programs used for the simulation of metallurgical processes. Originality/value: On the basis of applied research in close collaboration with industry companies, the obtained data can contribute significantly to optimize the operating conditions, thereby increasing the efficiency of the steelmaking technology and final quality of cast steel.

Słowa kluczowe

EN

steel; thermal analysis; solidus; liquidus; DTA; DSC

PL

stal; analiza termiczna; solidus; likwidus; DTA; DSC

• Wydawca: International OCSCO World Press
• Czasopismo: Archives of Materials Science and Engineering
• Rocznik: 2012
• Tom: Vol. 58, nr 2
• Strony: 116--119
• Opis fizyczny: Bibliogr. 11 poz.

Twórcy

autor

Klus P.

• Department of Metallurgy and Foundry and Regional Material Science and Technology Centre, FMME, VŠB-TU Ostrava, 17. listopadu 15/2172, 70833 Ostrava-Poruba, Czech Republic

autor

Zaludova M

• Department of Physical Chemistry and Theory of Technological Processes and Regional Material Science and Technology Centre, FMME, VŠB-TU Ostrava, 17. listopadu 15/2172, 70833 Ostrava-Poruba, Czech Republic

autor

Gryc K.

• Department of Metallurgy and Foundry and Regional Material Science and Technology Centre, FMME, VŠB-TU Ostrava, 17. listopadu 15/2172, 70833 Ostrava-Poruba, Czech Republic

autor

Smetana B.

• Department of Physical Chemistry and Theory of Technological Processes and Regional Material Science and Technology Centre, FMME, VŠB-TU Ostrava, 17. listopadu 15/2172, 70833 Ostrava-Poruba, Czech Republic

autor

Michalek K.

• Department of Metallurgy and Foundry and Regional Material Science and Technology Centre, FMME, VŠB-TU Ostrava, 17. listopadu 15/2172, 70833 Ostrava-Poruba, Czech Republic

autor

Dobrovska J.

• Department of Physical Chemistry and Theory of Technological Processes and Regional Material Science and Technology Centre, FMME, VŠB-TU Ostrava, 17. listopadu 15/2172, 70833 Ostrava-Poruba, Czech Republic

autor

Tkadleckova M.

• Department of Metallurgy and Foundry and Regional Material Science and Technology Centre, FMME, VŠB-TU Ostrava, 17. listopadu 15/2172, 70833 Ostrava-Poruba, Czech Republic

autor

Socha L.

• Department of Metallurgy and Foundry and Regional Material Science and Technology Centre, FMME, VŠB-TU Ostrava, 17. listopadu 15/2172, 70833 Ostrava-Poruba, Czech Republic

Bibliografia

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• [2] J. Miettinen, Metallurgical and materials transactions 28B (1997) 281-297.
• [3] B. Smetana, S. Zlá, J. Dobrovská, P. Kozelský, Phase transformation temperatures of pure iron and low alloyed steels in the low temperature region using DTA, International Journal of Materials Research 101/3 (2010) 398-408.
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• Ostrava, 2011.
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