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Phase Field Simulation of Grain Evolution during Hot Extruding of Steel Aermet100

Author: TangNing
Tutor: ZuoMuFu
School: Harbin Institute of Technology
Course: Materials Science
Keywords: Aermet100 steel Hot extrusion Grain evolution Phase field simulation
CLC: TG371
Type: Master's thesis
Year: 2008
Downloads: 103
Quote: 1
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Abstract


This paper , based on comprehensive analysis of the existing phase-field model to study polycrystalline plastic deformation and dynamic recrystallization microstructure evolution law in the process . Based on the Ginzburg - Landau theory of phase transitions (Ginzburg-Landau) , deformation dynamic recrystallization mechanism based on the theory , and consider the interaction between the double-well potential functions and field variables , constructed with a variation of constant method to characterize the deformation Reserve free energy functional expressions and dynamic recrystallization nucleation and growth , and numerical methods to solve this equation . The thermodynamic and kinetic theory , the the hot extrusion analog process phase field quantitative expression of the semi-empirical phenomenological parameters and deformation temperature , strain and strain rate . Establish this relationship and re - crystalline phase field free energy equation based on the phase-field model applies in Aermet100 steel hot extrusion dynamic recrystallization . The multiscale preparation phase field simulation software Based on the model , using object-oriented program development tools , macro parameter input and microscopic results output , storage , display, statistics automatically run dynamic recrystallization process Aermet100 steel indirect synchronization coupled modeling to create the conditions . The evolution of the hot extrusion process different points on the workpiece grain simulation forecast . The simulation results show that the plastic deformation caused by grain boundary stretched and kink promote recrystallization nucleation . In the deformation process, the average grain size of the workpiece With the increasing volume fraction of recrystallization decreases rapidly , have slowly increased after completion of the recrystallization . Simulation results and experimental results are basically consistent . On this basis , the actual piece forging process grain phase field simulation of the evolution of the forecast .

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CLC: > Industrial Technology > Metallurgy and Metal Craft > Metal pressure processing > Extrusion > Extrusion principle
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