Influence of burnishing condition on static recrystallization of an iron sheet

Abstract

Abstract This paper intends to study an effect of burnishing and annealing on static recrystallization. The result is expected to be used for a new technology to control only material surface microstructure in a steel plate. In this process, the stored strain energy by burnishing and the thermal energy by annealing lead to static recrystallization and grain growth in a material, which improve the microstructure of the material. In this paper, roller burnishing is employed to introduce the shear strain into the surface of the pure iron sheet. And effects of burnishing and annealing on static recrystallization in the finished surface layer are investigated utilizing Electron Back Scattering Diffraction (EBSD) analysis technique. The generation of shear deformation was confirmed by Kernel Average Misorientation (KAM) values at the surface layer. By conducting a series of the annealing and EBSD analyses, the static recrystallization process is observed. Since enough strain energy is accumulated by the burnishing in a specimen with large shear deformation zone, the static recrystallization occurs on the burnished surface preferentially after the annealing.