Numerical Simulation And Experimental Study On Hot Rolling Of AZ31B Magnesium Alloy

In recent years,with China's rapid economic development,environmental pollution problems become increasingly serious,lightweight national energy-saving emission reduction strategy to become the focus.Magnesium and magnesium alloy is the lightest structure of metal materials,with a higher than the strength,high stiffness,thermal conductivity,electromagnetic shielding signal ability,easy processing and forming the advantages of strong.In the automotive,3C digital,aerospace,medical and other fields have been widely used.Magnesium alloy research has become the subject of the development of the times.Magnesium alloy hexagonal crystal structure determines the room temperature plastic deformation capacity is limited,the specific heat capacity,thermal conductivity of these characteristics make magnesium alloy has a considerable temperature sensitivity.In the magnesium alloy rolling process,reasonable control of the temperature can fully guarantee the recrystallization of magnesium alloy sheet,while the rolling plate after the grain is fully refined to improve the mechanical properties of rolling plate to reduce surface cracks and edge crack to improve the finished product rate.In this paper,the surface temperature,macroscopic crack and surface morphology of the rolled magnesium alloy were analyzed by numerical simulation and experimental study.The microstructure was analyzed.The finite element model of the rolling process was established by MSC.Marc.The accuracy of the finite element model was verified by the experimental data.The influence of the rolling process parameters on the temperature field and the stress-strain field was studied by changing the roll temperature and the reduction,To determine the reasonable rolling process parameters.The surface roughness of the rolled plate and the surface SEM scanning were measured to obtain the post-rolling surface morphology and edge crack information.The microstructure of the rolled material was observed from grain size,surface roughness,macroscopic crack To explore the influence of various process parameters on the rolling of magnesium alloy after rolling.Experiments show that the roll temperature of 100? can significantly improve the recrystallization of magnesium alloy,fully refined grain,get a more uniform organization of magnesium alloy sheet.The end can do a 70% of the case of large reduction rate does not appear edge cracks.However,when the temperature is higher than 100 ?,the grain begins to grow and the edge crack begins to appear,and the surface of the roll is more serious,which makes the quality of AZ31 B magnesium alloy sheet after rolling.