Influence of the intercritical annealing time on the microstructure of a low carbon dual-phase steel
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2010-07-26
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FORGAS JUNIOR, A.
Rodrigo Magnabosco
Rodrigo Magnabosco
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65th ABM International Congress, 18th IFHTSE Congress and 1st TMS/ABM International Materials Congress 2010
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FORGAS JUNIOR, A.; MAGNABOSCO, R. Influence of the intercritical annealing time on the microstructure of a low carbon dual-phase steel. 65th ABM International Congress, 18th IFHTSE Congress and 1st TMS/ABM International Materials Congress 2010, v. 4, p. 3426-3437, jul. 2010.
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This work has the main purpose of analyzing the intercritical annealing time on the microstructure transformation kinetics of a dual-phase steel. Computational simulations confirmed the experimental observation, showing that annealing time at 755°C influences the formation of the austeno-ferri tic microstructure, and this can be attributed to the alloying elements partition and redistribution through ferrite-austenite interfaces. Kinetics calculations using a spherical model of diffusion, and a unidimensional model with bi-directional diffusion flux, resulted in equivalent results, which can partially describe the observed kinetics of transformation. Determination of basic metallographic parameters of the as-received material (martensite fraction and mean intercept), together to the knowledge of alloy elements distribution, are prerequisites to the success of the computational simulation.