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Acicular ferrite has been used to increase the toughness and strength of low-carbon alloy steel weld metals. Finely dispersed nonmetallic inclusions can serve as nucleation sites for acicular ferrite, and thus reduce the grain size and consequently improve the mechanical properties of steel. In this study, 7 ppm magnesium was added into Al-killed low-carbon steel (SS400) during secondary steelmaking to fine-tune the composition of the steel and obtain fine particles. The hot rolling process of the steel was simulated using a Gleeble 1500 thermal-mechanical simulator to investigate the relationship between heat treatment and the formation of acicular ferrite. Furthermore, the phase constitution and microstructure of SS400 were analyzed using scanning electron microscopy and electron backscatter diffraction. Finally, the optimal heat treatment of SS400 steel for forming acicular ferrite was determined.
Keywords: Acicular ferrite, Magnesium, Inclusion, Heat treatment, Low-carbon steel© This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.