Eff ect of Intercritical Annealing Conditions on Grain Growth Kinetics of Dual Phase Steel

다국어 초록 (Multilingual Abstract)

The study of grain coarsening and its kinetics during intercritical annealing is of vital importance for the production of dualphase (DP) steels with appropriate microstructure and properties required for industrial applications. In the present work, thekinetics of grain growth in the two-phase austenite plus ferrite region was studied based on the parabolic grain growth law.
It was revealed that the thermally-activated grain growth of ferrite depends on the soaking temperature and the presence ofaustenite islands, where these two factors compete with each other. As a result, by increasing the temperature, initially the rateof growth increases and the activation energy of grain growth ( Q ) was determined as 615 kJ/mol, which indicates the hightemperaturedependency. However, after the formation of a certain amount of austenite and the formation of chain-networkmorphology of austenite, the increase of temperature results in a decreased growth rate with the Q value of − 258 kJ/mol.
This suggests that the pinning eff ect counteracts the temperature eff ect in this stage. The eff ect of grain size on mechanicalproperties and work-hardening behavior was also discussed. Higher work-hardening rate was observed for the fi ne-grainedDP microstructures, which was found to be responsible for the better strength–ductility trade off .

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