The Secondary Development Of DEFORM Based On The Dynamic And Static Recrystallization Model Of PNM530 Stainless Steel

With the development of science and technology,using the method of numerical simulation of metal plastic deformation and heat treatment is paid close attention to study,all kinds of simulation software emerge in endlessly DEFORM-3D is a kind of analysis can be used to most of the thermal mechanical forming process,and many general method of heat treatment process simulation software is defined in the deformation of the initial workpiece geometry and materials,and then in turn simulation will be applied to each process of workpieces.However,the prediction of microstructure by DEFORM-3D software cannot meet all the requirements of users.However,DEFORM-3D software reserves a secondary development interface,and users can realize the function of predicting the evolution of microstructures through the development of subprograms.This paper is mainly based on the dynamic and static recrystallization model for the secondary development of DEFORM-3D simulation software.By writing the metal dynamic and static recrystallization model subroutine,and then using the interface file to embed the subroutine into DEFORM-3D software,the recrystallization grain evolution can be observed from the post-processing Firstly,through understanding the evolution law of metal microstructure,a flow chart was designed according to the evolution law of metal microstructure,and a subprogram was written in FORTRAN language to generate a data interface file.After the model was embedded,the parameters of PNM530 stainless steel recrystallization model were input in the pre-processing Advanced to observe the evolution law of the microstructure during the post-processing Finally carries on the simulation of PNM530 stainless steel hot compression technology,analyzes the different reduction temperature under different strain rate values,and percentage of dynamic recrystallization and grain size under different deformation heat preservation heat preservation time under different temperature,different percentage of static recrystallization and grain size values The following conclusion is obtained by the simulation results:(1)The grain size of dynamic recrystallization at the center of the workpiece is the smallest,followed by the drum zone.The lower and lower ends of the workpiece minimize the strain rate and increase the temperature,which is more conducive to the occurrence of dynamic recrystallization.(2)The static recrystallization occurs in the small strain region that does not reach the critical strain Extended holding time,increase thermal deformation,raise the temperature,more conducive to the occurrence of static recrystallization(3)use the same as the numerical simulation of the process parameters of testing,metallographic images obtained by the test after grain size measurement,compared with the results of numerical simulation The results show that the experimental grain size is similar to the simulated grain size,which indicates that the secondary development of Deform-3D in this paper is successful.