Research On Hot Extrusion Process Of Inconel 600 Alloy Tube Based On Physical And Numerical Simulation

Due to its performance advantages,the high-temperature nickel-based alloy Inconel 600 hot extrusion tubes have irreplaceable application prospects in military industry,nuclear power,thermal power,aviation,mining,oil well,petrochemical and other high-end and key fields of national economy.The research and development of high performance,high technical content and high added value hot extrusion high-temperature nickel-based alloy tube products is of far-reaching significance to promote the development of high-end high-temperature nickel-based alloy tube technology and strengthen the comprehensive economic strength of the country.In order to reduce production cost,control product quality and further improve the hot extrusion material properties of high-temperature nickel-based alloy Inconel 600,the thermal extrusion material properties of high-temperature nickel-based alloy Inconel600 are reduced.It is necessary to systematically study its hot working properties and deformation mechanism.The effects of hot compression processing parameters and the variations of microstructure of superalloy Inconel 600 pipes were studied.A combination of experiments and finite element analysis was explored by using Gleeble-3500 tester and Deform software.In terms of physical simulation,a single pass hot compression test was carried out on the annealed Inconel 600 alloy tube billet under the conditions of deformation temperature of 1000?1200?and strain rate of 0.01?10 s^-1by Gleeble-3500thermal simulation machine.The true stress-true strain curves of the material were collected and studied.Based on the DMM(Dynamic Material Modeling)theory,the thermal processing maps under the strain of 0.2?0.6 were constructed to reveal the evolution of the microstructure of the Material under different thermal deformation conditions.And for the hot extrusion process,the processing range of the non-rheological instability zone is selected.In the aspect of numerical simulation,the CA cellular automata model suitable for Inconel 600 alloy was established by using DEFORM-3D software.The hot extrusion process of Inconel 600 alloy tube under different process parameters was simulated and analyzed.The optimal process parameters were determined and the hot extrusion process of the hot extrusion tube under these parameters was simulated.The dynamic recrystallization behavior of microstructure in the hot extrusion deformation process was tracked and studied.Finally,the accuracy of CA cellular automata was verified by EBSD analysis of hot extrusion tube.The results show that the thermal deformation resistance of Inconel 600 alloy decreases significantly with the increase of deformation temperature and the decrease of strain rate,and the curve dynamic recrystallization characteristic is obvious at low strain rate.Suitable processing area in the thermal processing diagram of the material:minor strain:1060?1140?,0.01?0.1 s^-1and 1180?1200?,0.05?0.1 s^-1;The major strain was 1060?1140?,0.01?0.1 s^-1and 1180?1200?,0.05?0.1 s^-1.as the hot compression processing is concerned,the optimal parameters for Inconel 600 pipes is the following:the extrusion ratio is 5.65,the extrusion rate is250mm/s and the extrusion temperature is 1150?,which has been applied in factory and the yield of the pipes has been improved by 34%;As the microstructure is of Inconel 600 pipes concerned,the primary chain-like grains change to recrystallized equiaxed ones at last during the hot extrusion processing.The microstructure enhances the performance of pipes for the service in future.The simulation data is consistent with experimental results,which will be the basis for the production of hot extruded pipes of Inconel 600 super alloy.