Abstract
In hot precision forging helical gears, the dynamic recrystallization phenomena will occur, which affect the microstructure of the formed part and in turn decide their mechanical properties. To investigate the effect of deformation temperature on the dynamic recrystallization in hot precision forging helical gears, a three dimensional (3D) finite element (FE) model was created by coupling the thermo-mechanical model with the microstructure evolution model developed based on the hot compressive experimental data of 20CrMnTiH steel. The hot precision forging process was simulated and the effect laws of the deformation temperature on the microstructure evolution the formed part were investigated. The results show that the dynamic recrystallization volume fraction and the average grain sizes increased with the increasing deformation temperature and the higher deformation temperature is beneficial to dynamic recrystallization and grain refinement.
Highlights
Helical gears are the most widely used transmission component in many industrial fields such as machine, automobile, aeronautics and astronautics due to their high contact ration, smooth transmission [1]
The results show that the dynamic recrystallization volume fraction and the average grain sizes increased with the increasing deformation temperature and the higher deformation temperature is beneficial to dynamic recrystallization and grain refinement
During hot precision forging helical gears, the deformed metal workpiece will subject to some phenomena of microstructure evolution such as dynamic recrystallization (DRX), dynamic recovery (DRV) and grain growth owing to deformation temperature, strain rate and deformation degree [2]
Summary
Helical gears are the most widely used transmission component in many industrial fields such as machine, automobile, aeronautics and astronautics due to their high contact ration, smooth transmission [1]. During hot precision forging helical gears, the deformed metal workpiece will subject to some phenomena of microstructure evolution such as dynamic recrystallization (DRX), dynamic recovery (DRV) and grain growth owing to deformation temperature, strain rate and deformation degree [2]. These phenomena will affect the microstructure of the formed part and play an important role in determining the mechanical properties of the deformed product. The deformation temperature is a very significant factor that affects the distribution and evolution of the microstructure during hot metal forming process.
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