The transformation to austenite in a fine grained tool steel |
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| Authors: | S F Dirnfeld B M Korevaar F Van't Spijker |
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| Affiliation: | (1) Department of Materials Engineering, Technion-Israel Institute of Technology, Technion City, Haifa, Israel;(2) Metallurgical Department, Delft University of Technology, Delft, Netherlands;(3) Research Laboratory, A.K.Z.O. N.V., Arnhem, Netherlands |
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| Abstract: | The transformation to austenite in a fine grained tool steel has been investigated quantitatively until the disappearance
of the ferrite. The initial structure of the steel consisted of ferrite and globular carbides. The nucleation starts at carbides
which lie at the ferrite grain boundaries. The kinetics are in good agreement with Cahn's theory of grain boundary nucleated
transformation. A constant growth rate was found up to 30 pct transformation. Site saturation occurs early in the reaction;
this was confirmed by metallographic examination. The rate law is controlled by growth and is independent of the nucleation
rate. The mechanism which is controlling this growth is the advancing ferrite-austenite interface reaction. The alloying elements
influence the atomic mobilities, increasing the necessary activation energy to about 110 kcal/mol.
Formerly Research Engineer, Metallurgical Department, Delft University of Technology |
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