Abstract
This work presents relevant metallurgical considerations to produce galvanized dual phase steels from low cost aluminum-silicon steels which are produced by continuous strip processing. Two steels with different contents of Si and Al were austenized in the two-phase field ferrite + austenite (α + γ) in a fast manner to obtain dual phase steels, suitable for hot-dip galvanizing process, under typical parameters of continuous annealing processing line. Tensile dual phase properties were obtained from specimens cooled from temperature below Ar3, held during 3 min, intermediate cooling at temperature above Ar1 and quenching in Zn bath at 465 °C. The results have shown typical microstructure and tensile properties of galvanized dual phase steels. Finally, the synergistic effect of aluminum, silicon, and residual chromium on martensite start temperature (M s), critical cooling rate (C R), volume fraction of martensite, and tensile properties has been studied.
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The authors gratefully acknowledge the financial support of the Consejo Nacional de Ciencia y Tecnología and Universidad Autónoma de Coahuila.
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Equihua-Guillén, F., García-Lara, A.M., Muñíz-Valdes, C.R. et al. Simple Heat Treatment for Production of Hot-Dip Galvanized Dual Phase Steel Using Si-Al Steels. J. of Materi Eng and Perform 23, 268–274 (2014). https://doi.org/10.1007/s11665-013-0796-4
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DOI: https://doi.org/10.1007/s11665-013-0796-4