Abstract
The friction between the die and workpiece plays an important role in determining the quality of the finished products during the hot deformation. Based on the experimental results, a rigid-viscoplastic finite element model was made to study the effects of friction conditions on the strain distribution and microstructural evolution in high strength low alloy steel during hot upsetting process. Also, the effects of friction conditions on the forging loadings and shape geometry of the deformed specimen were also investigated. The results show that: (1) the deformation of specimen is inhomogeneous, and the degree of deformation inhomogeneity decreases with the increase of friction coefficient; (2) the dynamic recrystallization volume fraction decreases with the increase of friction coefficient; (3) the distribution of the average grain size is inhomogeneous in the deformed specimen, and the average grain size increase as the friction coefficient is increased; (5) the effects of friction conditions on the peak forging loading and shape geometry of the deformed specimen are significant.
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