The Effect of Annealing Temperature on the Properties and Second-Phase Particles of 0.4mm Galvanized Ti-IF Steel

A series of simulated continuum annealing experiments were done on 0.4mm Ti-IF by Gleeble-3800 thermal simulation machine at 700, 730, 760, 790, 820 and 850 degree. The optical microstructures of the specimens were characterized. Transmission electron microscopy analysis was carried out to investigate the second phase particles shape, size and distribution. The mechanical properties of the specimens were measured. The results showed that the yield strength and the tension strength of the steel decreased when the annealing temperature increased, the elongation increased when the annealing temperature increased, expect a maximum elongation value at 760 degree. Based on the microstructure and the second phase, the reason why there was a maximum value was discussed.