Research on Cogging Simulation of Large GH4169 Superalloy Cast Ingot
In order to solve the problem that the forging penetration of the GH4169 cast ingot becomes worse as the ingot size increases during cogging,in this paper,the finite element simulation method was adopted to reveal the distribution and evolution law of the billet temperature,equivalent strain and grain microstructure during cogging,so as to scientifically design the cogging process.By means of the finite element numerical simulation,the influence of different initial temperature and deformation rate on the strain field and temperature field in the upsetting process was studied,and the influence of different reduction rate,reduction in pass and entering amount on the temperature field and strain field in the drawing-out process was also studied.The equivalent strains at 1000℃,1050℃ and 1100℃ were compared,and it was found that as the temperature increased,the amount of metal deformation strain also increased.Comparing the reduction rates of 50 mm/s,100 mm/s,and 150 mm/s,it was found that the increase in deformation rate leads to the increase in deformation resistance,resulting in a significant increase in surface and core strain of the material.After comparing the drawing-out processes at initial temperatures of 1020℃,1050℃,and 1080℃,the evolution laws of equivalent strain,temperature field and strain field were obtained.The changes in strain were similar to those in the upsetting process,and the evolution of temperature field and strain field was influenced by the selected drawing-out conditions.The results show that during the upsetting process,the higher the initial temperature,the better the fluidity and the more uniform the deformation.The increase of the reduction rate will increase the internal temperature rise and will also enlarge the internal strain.The deformation process of billet during drawing-out process is similar to that of upsetting process,the evolution of temperature field and strain field is different from the time and heat of deformation during the whole drawing-out process.
GH4169 superalloyDEFORM simulationcoggingtemperature fieldstrain field
万方数据
维普
