Heterogeneous plastic deformation for HPT IF steel disks during compression stage

Abstract

Inhomogeneous distributions of hardness and microstructure of IF steel disks during compression stage of high pressure torsion (HPT) were observed and studied, and the experimental results were verified using simulation approach by ANSYS software. The results indicate that the stress, strain and hardness distributions of the IF steel are inhomogeneous in the compression stage of HPT, exhibiting lower hardness and smaller degree of deformation in center, homogeneous deformation with almost the same hardness in radial medium, higher hardness and bigger degree of deformation in edge. Otherwise, there is a small deformation zone named dead meal zone due to the vertical wall constraint. The experimental results of the hardness and micstructure are strongly supported by the simulation results, it is indicated that the distributions of hardness and microstructure are inhomogeneous due to the heterogeneous deformation of IF steel during the compression stage of high pressure torsion. ? 2017, Editorial Office of Transactions of Materials and Heat Treatment. All right reserved.