Mathematical Model of Bainitic Transformation in Austempered Ductile Iron

• Autorzy: Olejarczyk-Wożeńska I. , Adrian H. , Mrzygłód B. , Głowacki M.

Identyfikatory

DOI

10.1515/afe-2017-0158

• Języki publikacji: EN

Abstrakty

EN

A mathematical model of austenite - bainite transformation in austempered ductile cast iron has been presented. The model is based on a model developed by Bhadeshia [1, 2] for modelling the bainitic transformation in high-silicon steels with inhibited carbide precipitation. A computer program has been developed that calculates the incubation time, the transformation time at a preset temperature, the TTT diagram and carbon content in unreacted austenite as a function of temperature. Additionally, the program has been provided with a module calculating the free energy of austenite and ferrite as well as the maximum driving force of transformation. Model validation was based on the experimental research and literature data. Experimental studies included the determination of austenite grain size, plotting the TTT diagram and analysis of the effect of heat treatment parameters on the microstructure of ductile iron. The obtained results show a relatively good compatibility between the theoretical calculations and experimental studies. Using the developed program it was possible to examine the effect of austenite grain size on the rate of transformation.

Słowa kluczowe

EN

phase transformations modelling; austenite ferrite transformation; ADI cast iron; TTT diagram

PL

przemiany fazowe; transformacja austenityczna; żeliwo ADI; diagram TTT

• Wydawca: Komisja Odlewnictwa Polskiej Akademii Nauk Oddział w Katowicach
• Czasopismo: Archives of Foundry Engineering
• Rocznik: 2017
• Tom: Vol. 17, iss. 4
• Strony: 200--206
• Opis fizyczny: Bibliogr. 19 poz., tab., wykr.

Twórcy

autor

Olejarczyk-Wożeńska I.

• AGH University of Science and Technology, Faculty of Metals Engineering and Industrial Computer Science, Department of Applied Computer Science and Modeling, ul. Czarnowiejska 66, 30-054 Krakow

autor

Adrian H.

• AGH University of Science and Technology, Faculty of Metals Engineering and Industrial Computer Science, Department of Applied Computer Science and Modeling, ul. Czarnowiejska 66, 30-054 Krakow

autor

Mrzygłód B.

• AGH University of Science and Technology, Faculty of Metals Engineering and Industrial Computer Science, Department of Applied Computer Science and Modeling, ul. Czarnowiejska 66, 30-054 Krakow

autor

Głowacki M.

• AGH University of Science and Technology, Faculty of Metals Engineering and Industrial Computer Science, Department of Applied Computer Science and Modeling, ul. Czarnowiejska 66, 30-054 Krakow

Bibliografia

• [1] Chester, N.A. & Bhadeshia, H. (1997). Mathematical modelling of bainite transformation kinetics. Journal de Physique IV. C5(7), 41-46.
• [2] Bhadeshia, H. (1982). Thermodynamic analysis of isothermal transformation diagrams. Metal Science. 16, 159-165.
• [3] Bhadeshia, H. (2001). Bainite in steels. Transformations, microstructure and properties. 2 red., Cambridge: Institute of Materials.
• [4] Ławrynowicz, Z. & Dymski, S. (2006). Mechanism of bainitic transformation in ADI. Archives of Foundry. 6(19), 171-176. (in Polish).
• [5] Bhadeshia, H. & Edmonds, D.V. (1980). The mechanism of bainite formation in steels. Acta Metallurgica. 28(9), 1265-1273.
• [6] Bhadeshia, H. (1981). A rationalisation of shear transformations in steels. Acta Metallurgica. 29(6), 1117-1130.
• [7] Ławrynowicz Z. & Dymski, S. (2006). Application of bainitic transformation mechanism for ADI cast iron window molding. Archiwum Odlewnictwa. 6(19), 177-182. (in Polish).
• [8] Ławrynowicz, Z. (2016). Kinetics of the bainite transformation in austempered ductile iron ADI. Advances in Materials Science. 16(2), 47-56.
• [9] Rees, G.I. & Bhadeshia, H.K. (1992). Bainite transformation kinetics. Part 1 Modified model. Materials Science and Technology. 8, 985-993.
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Uwagi

PL

Opracowanie ze środków MNiSW w ramach umowy 812/P-DUN/2016 na działalność upowszechniającą naukę (zadania 2017).