Języki publikacji
Abstrakty
Presented paper demonstrates how the precipitation of cementite from ferrite or/and austenite in ADI may influence the extend of bainite reaction. Analytical calculations and experimental measurements of volume fraction of bainitic ferrite and volume of the untransformed austenite indicate that there is a necessity of carbides precipitation. 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”. The results are discussed in the context of displacive mechanism of bainite transformation.
Słowa kluczowe
Czasopismo
Rocznik
Tom
Strony
31--36
Opis fizyczny
Bibliogr. 13 poz., rys., tab., wykr.
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, vol.39, No 1, pp. 35-38, 1998.
- [2] Pietrowski, S., Nodular cast iron of bainitic ferrite structure with austenite or bainitic structure, Archives of Materials Science, vol. 18, No.4, pp.253-273, 1997. (in Polish)
- [3] Guzik, S.E., Austempered cast iron as a modern constructional material, Inżynieria Materiałowa, nr 6, pp.677-680, 2003. (in Polish)
- [4] Takahashi, M., Bhadeshia, H.K.D.H., A Model for the Microstructure of Some Advanced Bainitic Steels, Materials Transaction, JIM, 32, pp. 689-696, 1991.
- [5] Ławrynowicz, Z., Transition from upper to lower bainite in Fe-Cr-C steel, Materials Science and Technology, 20, pp.1447-1454, 2004.
- [6] Ławrynowicz, Z., A discussion on the mechanism of bainite transformation in steels, Technology and Materials, Gdańsk, Politechnika Gdańska, 4, pp.149-155, 2006, (in Polish)
- [7] Ławrynowicz, Z., Mechanism of bainite transformation in Fe-Cr-Mo-V-Ti-C steel, International Journal of Engineering, 12, pp.81-86, 1999.
- [8] Christian, J.W., Theory of transformations in metals and alloys, 778, Oxford, Pergamon Press, 1965.
- [9] Bhadeshia, H.K.D.H., Bainite in Steels, Institute of Materials, 1-458, London, 1992.
- [10] Shiflet, G.J., Hackenberg, R.E., Partitioning and the growth of bainite, Scripta Materialia, 47, pp.163-167, 2002.
- [11] Bhadeshia, H.K.D.H., Diffusion of carbon in austenite, Metal Science, 15, 477-479, 1981.
- [12] Kutsov, A. at al., Formation of bainite in ductile iron, Materials Sci. and Engineering, A273-275, pp.480-484, 1999.
- [13] Bhadeshia, H.K.D.H., Christian, J.W., Bainite in Steels, Metallurgical Transactions A, 21A, pp.767-797, 1990.
Identyfikator YADDA
bwmeta1.element.baztech-610122dc-1e4c-43e1-be11-87ef517613cd