Reference : Microstructure and Mechanical Properties of a Mixed Si-Al TRIP-Assisted Steel Subject...
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Microstructure and Mechanical Properties of a Mixed Si-Al TRIP-Assisted Steel Subjected to Continuous Galvanizing Heat Treatments
Mertens, Anne mailto [Université de Liège - ULiège > Département d'aérospatiale et mécanique > Science des matériaux métalliques >]
Bellhouse, Erika M. mailto [ArcelorMittal Dofasco > > > >]
McDermid, Joseph R. mailto [McMaster University > McMaster Steel Research Centre > > >]
Materials Science and Engineering: A: Structural Materials: Properties, Microstructures and Processing
Elsevier Science
Yes (verified by ORBi)
[en] Mechanical Characterization ; X-ray diffraction ; Steel ; Austenite ; Martensitic transformation
[en] Heat treatments with an isothermal bainitic transformation temperature of 465°C compatible with the continuous galvanizing process were performed on a 0.2C-1.5Mn-1.0Si-0.5Al (wt%) TRIP-assisted steel. The effect of intercritical annealing temperature and isothermal bainitic transformation (IBT) time at 465C on mechanical properties and microstructure were determined. The best combination of strength and ductility was obtained for the lower intercritical annealing temperature of 750°C for an isothermal bainitic transformation time of 90 s at 465°C. However, after intercritical annealing at a higher temperature of 797°C, optimum mechanical properties were obtained for a shorter isothermal bainitic transformation time of 60 s at 465°C, likely due to the lower C content of the intercritical austenite bringing about faster transformation kinetics. It was concluded that varying the intercritical temperature and IBT time can play an important role in the development of a suitable process window to obtain the desired mechanical properties in low alloy TRIP-assisted steels given the constraints associated with the continuous galvanizing process.
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