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Relative Influences of Aluminium and Silicon on the Kinetics of Bainite Formation from Intercritical Austenite
Author(s) -
Mertens A.,
Jacques P.J.,
Sietsma J.,
Delannay F.
Publication year - 2008
Publication title -
steel research international
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.603
H-Index - 49
eISSN - 1869-344X
pISSN - 1611-3683
DOI - 10.1002/srin.200806226
Subject(s) - bainite , materials science , nucleation , metallurgy , austenite , aluminium , silicon , precipitation , kinetics , carbide , silicon carbide , carbon fibers , thermodynamics , microstructure , composite material , physics , meteorology , composite number , quantum mechanics
Bainite formation from intercritical austenite is of great practical importance for the production of TRIP‐assisted steels. Silicon and aluminium play important roles during this transformation by delaying carbide precipitation, thus favouring the carbon enrichment of untransformed austenite, which makes its stabilisation down to room temperature possible. Previous studies have shown a strong dependence of bainite formation kinetics on both chemical composition and transformation temperature. In the present work, the effect of silicon and aluminium contents on bainite formation kinetics is investigated experimentally using dilatometry combined with microscopical observations. The experimental results are analysed by comparison with thermodynamic parameters, such as the activation energy G 1 for nucleation of bainite and the carbon content C to corresponding to the T o ‐curve. It is shown that the faster transformation kinetics induced by the substitution of silicon by aluminium can be ascribed (i) to a higher driving force for nucleation, (ii) to a higher carbon content C to at the To‐curve and (iii) to the precipitation of carbide in austenite in steels with a low Al content.