Grain Boundary Segregation Study On Rich Copper Phase In Steel Under Tensile Stress

In this experiment,the experimental steel with the different copper content and silicon content smelting by using medium frequency induction furnace is used in the laboratory.According to the Gleeble-3500 thermal/force simulation tester,the experimental steel is processed,and then the Gleeble-3500 thermal/force simulation tester was used to apply the uniaxial tensile stress phase transformation experiment.Studies have shown as follows: When the deformation is constant,the tensile stress decreases with the increases of the temperature.When both the deformation and temperature are constant,tensile stress decreases with the increases of Si element in steel.When the mass content of Si in steel is 0.26% and the drawing temperature is1100 ℃,the tensile stress of copper-bearing steel is the least.The effect of Si element on the grain boundary segregation of steel in steel was investigated by the optical microscope and scanning electron microscopy(SEM).And study the influence of Si element on the grain-boundary segregation of Si element in steel was investigated under high temperature drawing force.Studies have shown as follows: the tensile stress is not applied on copper-bearing steel,the content of copper element in the grain boundary is larger than that in the grain,and the increase of the copper content in the axial direction is less than that in the cross section.The tensile stress is applied on copper-bearing steel: when the deformation is 0.2,the micro cracks on the surface of the drawing steel show that the segregation degree of copper element in steel is not the same.Although the Si element forming SiO2 or2FeO·SiO2 in the steel immobilizes Cu element in grains,it increases Cu segregation in steel.The tensile stress on experimental steel can reduce the segregation degree of copper element in steel.The Si element aggravates the segregation of copper element in steel.When the uniaxial tensile stress is applied on experimental steel with 0.26%Si element at a temperature of 1100℃,the segregation degree of copper element steel decreases.