Research On Trans-scale Numerical Simulation Method Of Mechanical Properties Of 2205 Duplex Steel

Due to its two-phase structure of austenite and ferrite,duplex stainless steel can take into account the advantages of two phases in the process of material processing.It is a high-performance metal material with broad development prospects.However,due to the differences in the performance and structure of the two phases,the stress and strain distribution in the two phases are not uniform during the deformation process,and the deformation coordination is poor,which eventually leads to defects such as cracks in the material during processing.Therefore,how to accurately obtain the mechanical properties of each component phase of the dual-phase material,so as to explore the deformation coordination between the phases of the dual-phase material during the deformation process and the deformation relationship between the macro and micro are particularly important.At present,the research and study of the deformation coordination of two-phase materials mostly rely on the finite element numerical simulation technology,but because the construction of the mesoscopic representative voxel model is very difficult,there is a huge difference in the size of the two models to reflect the macroscopic mechanical properties through the mesoscale Therefore,this article uses Neper software and Python script files,combined with the metallographic photos of 2205 duplex stainless steel and the two comparative examples,to establish a 3D representative voxel model of 2205 duplex stainless steel.The microstructure mechanical properties of 2205 duplex stainless steel were determined by nanoindentation test.Systematic analysis of how to reverse the microstructure mechanical properties of the material through the nano-indentation test system,fitting the curve of the nano-indentation experiment results of 2205 duplex stainless steel,combined with the reverse inference process,the 2205 duplex stainless steel was calculated Mechanical property parameters of austenite phase and ferrite phase.The rolled 2205 duplex stainless steel was used as the simulation material to simulate the single-tensile deformation process of the experimental steel at room temperature.Thesimulation consists of two parts: a macro model and a meso representative voxel sub-model.The tensile deformation process of 2205 duplex stainless steel was analyzed in detail.The simulation curve and experimental curve of the meso representative voxel sub-model are compared to verify the accuracy of the technical route.On this basis,the representative voxel model and the Python script file were further used to build a simulation model,with grain morphology,stretching amount and stretching direction as the influencing factors.The three variables were discussed respectively by the control variable method for the 2205 biphasic effect of stainless steel deformation coordination.It provides certain technical support for rationally regulating the processing performance of dual-phase materials,formulating reasonable processing techniques,and developing and designing new steel types.