High Temperature Creep Behavior Of Q460E Steel And Continuous Casting Billet Bulging Deformation Research

Continuous cast steel is one of the main technologies of steel production.The quality of continuous casting billet is directly related to the quality of steel products.The occurrence of cracks and other defects of continuous casting is related to the change of the creep behavior of the casting material at high temperature.Therefore,it is significant to improve the quality of continuous casting billet by studying the creep mechanism of the slab at high temperature.In this paper,the material is Q460 E steel billet as the research object,the following four aspects of researchHigh temperature creep tensile test was carried out using Gleeble3800 thermal simulation testing machine.The specimens were subjected to rapid cooling after the tensile test,and the microstructure of the billet was preserved at high temperature.The data of Gleeble3800 were collected and processed by Origin,the stress time curves of the samples were plotted in the high temperature range,and the effects of stress and temperature on the creep process were analyzed.Considering the high temperature condition in the billet of Q460 E steel after adopting appropriate creep theory,determine the creep of this steel type equations,strain time curve using the experimental data of the sample were analyzed to determine the parameters of linear fitting equation,the constitutive equation of Q460 E high temperature creep condition.Predicted by the constitutive equation of strain time curve,found that the experimental value and calculated strain time curve is consistent,so it can be initially determined that the constitutive model is effective to describe the creep behavior of Q460 E steel under high temperature description.On the basis of high temperature creep tensile test,the microstructure of the samples was observed.Through metallographic observation the experimental study on the effect of microstructure and temperature and load on it,by transmission electron microscopy(TEM)to study the dislocation and slip inside the specimen tissue proportion,analyses the change of creep process of the organization.Temperature field simulation of slab during continuous casting process.Firstly,the temperature field model,according to the results,the constitutive equations of Q460 E steel using user subroutine in forturn software development two times and into MSC.Marc,to simulate the temperature field simulation results show that the billet in bending and straightening process of the temperature field and the changes of shell thickness the change rule of.Based on the simulation results of temperature field,the finite element model of the shell was built to simulate the bulging deformation.Based on the analysis of the simulation results,the variation law of the bulging deformation,bulging deformation and bulging strain of the continuous casting billet is summarized.The simulation results are compared with the results of creep deformation,and the effect of creep deformation on the bulging deformation is obtained.The research on the bulging deformation can not only help to get the technical scheme which is beneficial to the actual production,but also compare with the maximum strain value of the design personnel of the baosteel.