Study On Hot Deformation Behavior And Hot Stamping Process Simulation Of High Strength Steel22MnB5

With the rapid development of society, automobile industry has become theguiding industry to the economic and cultural. As environmental protection andenergy saving is the global development direction in21st century, automotivelightweight has become the industry research direction. Application of high strengthsteel is one of effective ways to reduce weight and improve safety performance, butcold forming of high strength steel is difficult and it has poor dimensional accuracy.Hot forming technology make the widely use of high strength steel componentspossible. This article takes22MnB5steel plate as the research objective, combines themethod of thermal simulation experiment, numerical simulation experiments and hotstamping verification tests to study the hot forming process of high strength steel.Gleeb1500thermal simulation testing machine is used for high temperaturetensile experiments of2222MnB5steel, which provides reliable data for finiteelement simulation modeling. Microstructure analysis is combined with the stress-strain curve to study the rheological behavior in hot stamping process, and the resultsshow that rheological behavior of boron steel at high temperature is a typical dynamicresponse type, which means the flow stress decreases with the increase of deformationtemperature and the decrease of strain rate.Based on the true stress-strain curve obtained in the experiment, use Dynaform todo thermal coupling calculation of hot stamping process. So the stress andtemperature distribution and change of blank in the forming process can be obtained.Then analyze the effects which the main process parameters such as the initialtemperature of blank, stamping speed and holding time have on hot stamping. Thefinite element simulation analysis has provided an effective basis for the hot stampingexperiment.Do the hot stamping experiment of U-shape based on finite element simulationanalysis results and analyze the dimensional precision of hot stamping parts. Theresults of microstructure observations and mechanical performance test show thatmartensite structure generates during the hot stamping process, and parts with highstrength are obtained. By comparison with the experimental results, the high accuracyand reliability of the finite element simulation are verified.