MATERIALS TRANSACTIONS
Online ISSN : 1347-5320
Print ISSN : 1345-9678
Time-Temperature-Transformation Diagram within the Bainitic Temperature Range in a Medium Carbon Steel
Francisca G. CaballeroMaria Jesús SantofimiaCarlos García-MateoCarlos García de Andrés
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2004 Volume 45 Issue 12 Pages 3272-3281

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Abstract

The time-temperature-transformation (TTT) diagram within the medium temperature range of medium carbon steel has been determined. A single type of C-curve is found within the bainite temperature range for the studied steel. Distinct reaction C-curves were not observed for both types of microstructure, upper bainite and lower bainite in the TTT diagram. Experimental results on the kinetics of the isothermal formation of bainite at different temperature have demonstrated that both type of microstructure, upper and lower bainite, possesses similar overall transformation kinetics. Some applications of phase transformation theory towards the formation of bainitic microstructures are discussed, with particular emphasis on the bainite start temperature, transition temperature from upper to lower bainite, martensite start temperature and the thickness of bainitic plates.

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© 2004 The Japan Institute of Metals and Materials
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