Microstructure and mechanical property connections for a punched non-oriented electrical steel lamination

摘要: Abstract Secondary manufacturing processes used on electrical steels, such as mechanical or laser cutting, have a detrimental effect the magnetic properties and increase losses for electric motors. When process is mechanical, there both work hardening, residual stress induced near cut edge. The knowledge of type deterioration edge degree important designing machines in terms field loss calculations. present paper evaluates punching microstructure non-oriented steel. Scanning Electron Microscopy (SEM) backscattered diffraction (EBSD) analysis was performed cross section punched steel to study evolution crystallographic texture whereas nanoindentation determine hardness profile. observed were related edge, which highly heterogeneous. consisted elongated grains shear bands with ultrafine size smaller than 500 nm. maximum region where value obtained 4.54 GPa. This increase, respect average undamaged (3.15 GPa), attributed various factors grain refinement, hardening stress. Finally, pop-in done extent due its hardness. zero extended distance 200 µm from fracture it 50 µm roll over section.