Abstract
The overall kinetics of the isothermal transformation of austenite to ferrite and bainite at intermediate temperatures and the microstructure of the transformation products in Fe-C-Ti, Fe-C-Ti-Si, Fe-C-Ti-Mn, and Fe-C-Ti-Mn-Si alloys were investigated with dilatometry, quantitative metallography, and TEM. The rate of transformation of austenite is retarded and the precipitation of carbide is inhibited in Ti-containing alloys by additions of Si, Mn, or Si + Mn. In addition to bainite and degenerate ferrite plates, a large amount of granular structure consisting of martensite and retained austenite (so-called granular bainite) is observed in these alloys if the isothermal reaction time is not long enough to complete austenite decomposition. It is suggested that the inhibiting effect of Si on carbide precipitation, the segregation of carbideforming elements to prior γ grain boundaries and interphase interfaces, and the enhancing effect of Si on the segregation of these elements lead to the results obtained. The results also support the view that so-called granular bainite is a mixture of transformation products produced by the partial decomposition of austenite.
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Former Graduate Student, Southwest Jiaotong University
This paper is based on a presentation made in the symposium “International Conference on Bainite” presented at the 1988 World Metals Congress in Chicago, IL, on September 26 and 27, 1988, under the auspices of the ASM INTERNATIONAL Phase Transformations Committee and the TMS Ferrous Metallurgy Committee.
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Liu, S.K., Zhang, G.Y. The effect of Mn and Si on the morphology and kinetics of the bainite transformation in Fe-C-Ti alloys. Metall Trans A 21, 1509–1515 (1990). https://doi.org/10.1007/BF02672565
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DOI: https://doi.org/10.1007/BF02672565