Study on Effect of Environmental Corrosion on Mechanical Properties of Dual Phase Steel
In order to study the mechanical properties of dual-phase steel under uncorroded and corroded conditions,steel bar specimens with different corrosion rates were prepared by salt spray test.The tensile strength,deformation capacity,dissipated energy and failure cycles of steel bars under different corrosion rates were analyzed by monotonic tensile test and low cycle fatigue test.The results show that ordinary steel and dual-phase steel have similar yield strength and ultimate tensile strength under uncorroded conditions,but the maximum load elongation and ultimate elongation of dual-phase steel are significantly higher than those of ordinary steel.Compared with uncorroded steel bars,corrosion has a great influence on the monotonic mechanical properties of steel bars.The corrosion rate has no obvious effect on the cyclic performance of steel bars.The ductility,corrosion resistance and cycle performance of dual phase steel are better than those of ordinary steel.For reinforced concrete members under environmental conditions such as marine climate,salt fog,and high humidity,dual-phase steel can be used instead of ordinary steel to improve the mechanical properties of members.
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