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The purpose of the present paper is to demonstrate how a thermodynamic method can be used for solving a problem of the decarburisation of bainite laths and carbon diffusion distances in the matrix of ADI. This should in principle enable to examine the partitioning of carbon from supersaturated ferrite laths into adjacent austenite and the carbon content in retained austenite using analytical method. The paper presents an investigation of the time required for the diffusion of carbon out of supersaturated laths of ferrite into the retained austenite. A consequence of the precipitation of cementite from austenite during austempering is that the growth of bainitic ferrite can continue to larger extent and that the resulting microstructure is not an ausferrite but it is a mixture of bainitic ferrite, retained austenite and carbides. In case of this microstructure the product of austempering reaction in ductile iron is rather bainite than “ausferrite”.
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Czasopismo
Rocznik
Strony
9--18
Opis fizyczny
Bibliogr. 18 poz., wykr., rys., tab.
Twórcy
autor
- University of Technology and Life Sciences, Mechanical Engineering Faculty, Department of Materials Science and Engineering, av. Kaliskiego 7, 85-789 Bydgoszcz, Poland
Bibliografia
- 1. Chang L.C.: Carbon content of austenite in austempered ductile iron. Scripta Materialia. 39 (1998), 35-38.
- 2. Pietrowski S.: Nodular cast iron of bainitic ferrite structure with austenite or bainitic structure.Archives of Materials Science. 18 (1997), 253-273. (in Polish)
- 3. Guzik S.E.: Austempered cast iron as a modern constructional material. Inżynieria Materiałowa. 6 (2003), 677-680. (in Polish).
- 4. Ławrynowicz Z., Dymski S.: Analysis of carbon diffusion during bainite transformation in ADI.Archives of Foundry Engineering. 7 (2007), 87-92.
- 5. Takahashi M., Bhadeshia H.K.D.H.: A Model for the Microstructure of Some Advanced Bainitic Steels. Materials Transaction. JIM. 32 (1991) 689-696.
- 6. Ławrynowicz Z.: Transition from upper to lower bainite in Fe-Cr-C steel. Materials Science and Technology. 20 (2004), 1447-1454.
- 7. Ławrynowicz Z.: A discussion on the mechanism of bainite transformation in steels. Technology and Materials. Gdańsk. Politechnika Gdańska. 4 (2006), 149-155 (in Polish).
- 8. Ławrynowicz Z.: Mechanism of bainite transformation in Fe-Cr-Mo-V-Ti-C steel. International Journal of Engineering. 12 (1999), 81-86.
- 9. Christian J.W.: Theory of transformations in metals and alloys, 778, Oxford, Pergamon Press, 1965.
- 10. Bhadeshia H.K.D.H.: Bainite in Steels. Institute of Materials. 1-458, London, 1992.
- 11. Kinsman K.R., Aaronson H.I., The transformation and hardenability in steels, Climax Molybdenum Company, Ann Arbor, MI, p.39, 1967.
- 12. Bhadeshia H.K.D.H., Christian J.W.: Bainite in Steels. Metallurgical Transactions A. 21A (1990), 767-797.
- 13. H.K.D.H. Bhadeshia: Diffusion of carbon in austenite. Metal Science. 15 (1981), 477-479.
- 14. Siller R.H., McLelan R.B.: The Application of First Order Mixing Statistics to the Variation of the Diffusivity of Carbon in Austenite. Metallurgical Transactions. 1 (1970), 985-988.
- 15. Ławrynowicz Z.: Criticism of selected methods for diffusivity estimation of carbon in austenite.Zeszyty Naukowe ATR. nr 216, Mechanika 43 (1998), 283-287. (in Polish).
- 16. Ławrynowicz Z.: Bainitic transformation: estimation of carbon diffusivity in austenite on the basis of measured austenite film thickness. Zeszyty Naukowe ATR. nr 216 Mechanika 43, (1998) 289-297. (in Polish).
- 17. Ławrynowicz Z.: A discussion on the mechanism of bainite transformation in steels. Technology and Materials. Gdańsk, Politechnika Gdańska. 4, (2006), 149-155. (in Polish)
- 18. Ławrynowicz Z.: Observation of interphase boundary: bainite-non-pearlitic eutectoid in Cr-Mo-C alloy by TEM. Technology and Materials. Gdańsk, Politechnika Gdańska. 4 (2006), 156-160. (in Polish)
Typ dokumentu
Bibliografia
Identyfikator YADDA
bwmeta1.element.baztech-93255fc0-53a9-4216-8450-6fee2f42413c