Experimental study on mechanical properties of corroded Q355 weathering steel at high temperature
In order to study the evolution of mechanical properties of corroded steel at high temperature,high temperature tensile tests were conducted on 12 mm thick Q355 weathering steel that had been in service for 10 years.The damage morphology,stress-strain curve and mechanical property degradation law of corroded steel at different temperatures were discussed.A numerical analysis model considering the surface morphology of corroded steel was established using three-dimensional reverse reconstruction technology.The development law of surface stress of corroded steel at different temperatures was studied,and the surface stress concentration coefficient and damage law of corroded steel at different temperatures were compared.The results show that the surface of the corroded steel is uneven and features pits of different sizes.With the increase in the degree of rust,the strength and ductility of steel at room temperature gradually decrease,with ultimate strength and elongation decreasing by 20％and 39％,respectively.As temperature increases,the influence of corrosion on the elastic modulus of steel is intensified,and the surface stress concentration of the specimens gradually decreases.When the temperature reaches 900 ℃,the mechanical properties of steel with different degrees of corrosion are found to be basically the same.High temperature significantly reduces the influence of corrosion damage,but the influence of rust on the ductility of steel still exists.
weathering resistant steelcorrosionhigh temperature testmechanical propertydegradation law
万方数据
维普
