Austenite double decomposition into bainite in high carbon steels

• Autorzy: Woźniak T. Z.
• Języki publikacji: EN

Abstrakty

EN

This paper describes a model of bainitic transformation. The model takes into consideration a range of lower bainite in high carbon steels (the swing back effect near the temperature Ms). The models take into account a simultaneous decomposition of austenite into two transformation products: bainite at the austenite grain boundary and on martensite spines. Analyses concerning the nucleation of sub-plates have been presented. Having two models assumes that the subplate growth is of a logarithmic and exponential character. In order to calculate a volume fraction of two components of bainite fB1 and fB2 , formulas linking an actual volume increase of the components with their current growth have been applied, leading to extended volume. The results of dilatometric studies and quantitative analyses of micro structural components were used in optimizing procedures.

Słowa kluczowe

EN

bainite; swing bac; butterfly; kinetics; simultaneous

• Wydawca: Politechnika Gdańska
• Czasopismo: Advances in Materials Science
• Rocznik: 2005
• Tom: Vol. 5, nr 1-3
• Strony: 80--97
• Opis fizyczny: Bibliogr. 31 poz., 9 rys.

Twórcy

autor

Woźniak T. Z.

• Kazimierz Wielki University, Institute of Technology, Section of Materials Engineering, Bydgoszcz, Poland

Bibliografia

• 1. Ławrynowicz Z., Barbacki A., Features of bainite transformation in steels, Advances in Materials Science 2, 2002, pp. 5-32.
• 2. Ławrynowicz Z., Carbon partitioning during bainite transformation in low alloy steels, Materials Science and Technology, 11, 2002, pp. 1322-1324.
• 3. Rees G.I., Bhadeshia H.K., Bainite Transformation Kinetics: Part II. Non-Uniform Distribution of Carbon, Materials Science and Technology, 8 1992, pp. 994-996.
• 4. Bhadeshia H.K., Waugh A.R., Bainite: An Atom-Probe Study of the Incomplete Reaction Phenomenon, Acta Metall, 30, 1982, pp. 775-784.
• 5. Matas S.J., Hehemann R.F., The Structure of Bainite in Hypoeutectoid Steels, Trans. TMS-AIME, 221, 1961, pp. 179-185.
• 6. Christian J. W., Theory of Transformations in Metals and Alloys, Part I, Pergamon Press, Oxford 1975.
• 7. Jones S. J., Bhadeshia H.K.D.H., Kinetics of the Simultaneous Decomposition of Austenite into Several Transformation Products, Acta Materialia, 45, 1997, pp. 2911-2920.
• 8. Woźniak T.Z., Modeling Kinetics of the Austenite Simultaneous Decomposition into Two Bainitic Products in the Range of Swing Back, Materials Science and Engineering, A, 2005 (in press after recommendation).
• 9. Oka M., Okamoto H., Swing Back in Kinetics near Ms in Hypereutectoid Steels, Metallurgical and Materials Transactions, A 19A, 1988, pp. 447-452.
• 10. Okamoto H., Oka M., Lower Bainite with Midrib in Hypereutectoid Steels, Metallurgical and Materials Transactions, A 17, 1986, pp. 1113-1120.
• 11. Woźniak T.Z., Kinetic Models of Phase Transformations, Sci. Bull., No. 241, Mechanics 53, University of Technology, Bydgoszcz 2002, pp. 291-299.
• 12. Woźniak T. Z, Jeleńkowski J., Morphology of Lower Bainite in Swing Back, Proc. Conf. Selection and Utilization of Engineering Materials, Technical University of Gdańsk – Jurata 22-25, September 1997, pp. 207-215.
• 13. Woźniak T. Z., Kinetics and Morphology of a Product of Bainite Transformations in the Range of Swing Back, Archives of Materials Science, 23, 2002, pp. 351-374.
• 14. Kedzierski Z., Phase Transformation in Solid State, AGH, Krakow 2003.
• 15. Hehemann R. F., Phase Transformations, Metals Park, OH, ASM, 1970.
• 16. Rees G.I., Bhadeshia H.K.D.H., Bainite transformation kinetics. Part 1 Modified model, Mater. Sci. and Technol., 8, 1992 pp. 985-993.
• 17. Rees G.I., Bhadeshia H.K.D.H., Bainite transformation kinetics. Part 2 Non-uniform distribution of carbon, Mater. Sci. and Technol., 8, 1992, pp. 994-996.
• 18. Spanos G., Fang H.S., Aaronson H.I., A Mechanism for the Formation of Lower Bainite, Metall. Trans., A 21, 1990, pp. 1381-1390.
• 19. Christian J.W., Edmonds D.V., Phase transformations in ferrous alloys, A.R. Marder and J.I. Goldstein (ed.), TMS-AIME, Warrendale, PA, 1984.
• 20. Bhadeshia H.K., Christian J.W., Bainite in Steels, Metall. Trans., A 21, 1990, pp. 767-797.
• 21. Bhadeshia H.K., Growth rate data on bainite in alloy steels, Mater. Sci. Technol., 5, 1989, pp. 398-402.
• 22. Bhadeshia H.K., Phase transformations in ferrous alloys, A.R. Marder and J.I. Goldstein (ed.), TMS-AIME, Warrendale, PA, 1984.
• 23. Speich G.R., Morris Cohen: The growth Rate of Bainite, Trans. TMS-AIME 218, 1960, pp. 1050-1059.
• 24. Jones S.J., Bhadeshia H.K D.H., Kinetics of the Simultaneous Decomposition of Austenite into Several Transformation Products, Acta Materialia, 45, 1997, pp.2911-2920.
• 25. Aaron H.B., Fainstein D., Kotler G.R., Diffusion-Limited Phase Transformations: A Comparison and Critical Evaluation of the Mathematical Approximations, J. Appl. Phys., 41, 1970, pp. 4404-4410.
• 26. Reti T., Fried Z., Felbe I., Computer simulation of steel quenching process using a multi-phase transformation model, Comp. Mater. Sci., 22, 2001, pp. 261-278.
• 27. Shui C.K, Rynolds Jr W.T., Shiflet G.J., Aaronson H.I., A Comparison of Etchants for Microstructures in Fe-C-Mo Alloys, Metallography, 21, 1988, pp. 91-102.
• 28. Woźniak T.Z., Jeleńkowski J., Kinetics of the Austenite Decomposition into Lower Bainite in High Carbon Steels under Austempering Heat Treatments, Sci. Bull., No. 193, Mech. 38, ATR, Bydgoszcz 1995, pp. 103-110.
• 29. Woźniak T.Z., Changes of Bainite Transformation Velocity Formed at Temperatures Near the Ms in High Carbon Steel, 2nd All-Polish Scientific Conference, Technical University of Cracow, 16-18 September, 1999, pp. 171-177.
• 30. Schaber O., Some Observations on Isothermal Austenite Transformation Near the Ms Temperature, Trans. AIME, 203, 1955, pp. 559-560.
• 31. Singh S. B., Bhadeshia H.K.D.H., Estimation of Bainite Plate-Thickness in Low-Alloy Steels, Materials Science and Engineering, A245, 1998, pp. 72-79.