The Grain Evolution Model During Hot Deformation Process Of AF1410 Steel And Numerical Simulation Of The Typical Aerospace Forgings

The integration and large-scale construction of aviation structures is an important trend in the future development.Large-scale aviation forging technology will become an important development direction of modern aviation manufacturing industry.Because of the high strength,good plastic toughness and fatigue resistance fracture AF1410 ultra-high strength steel is widely used in the contemporary aircraft landing gear,flat tail shaft and other important bearing forging all over the world.In order to promote the progress of related technologies and support the rapid development of aviation industry in our country,it is imperative to carry out basic research on the industrial production of AF1410ultra-high strength steel.In the present article,the research object was aerospace forging of AF1410 ultra-high strength steel,using Gleeble-3800 thermal simulation test machine,the rheological curve of AF1410 ultra-high strength steel was obtained by the hot compression test under the temperature of 850??1150?and the strain rate is 0.001?1s^-1.The rheological curve were revised by temperature,friction conditions.The constitutive model and thermal processing map of AF1410 steel were established by the modified curve.In the meanwhile,the deformation temperature and strain rate parameters of the hot working process were determined.Aiming at the problem of austenite grain growth during the heating process of AF1410 steel,the austenite grain length under the condition of heating temperature of800??1200?and holding time of 20min?180min was studied by metallographic analysis.The influence of heating temperature and holding time on the austenite grain size was analyzed.The austenite grain growth model of AF1410 steel was established.The forging process and grain evolution of an aeronautical forging of AF1410 steel were numerically simulated by using DEFROM-3D finite element software.The effects of forging temperature and press velocity of the hydraulic beam on the temperature field,forming load,stress distribution and recrystallization grain size were analyzed.The article show the proper forging temperature and press velocity of the hydraulic beam during hotdie forging.