Investigation of Surface Crack Types under Axial Compression Loading for a Case-Hardening Steel
During cold-forming operations the formability of the materials can be reached due to the low process temperature, leading to crack initiation. For the investigated case-hardening steel 16MnCrS5 longitudinal cracks and shear cracks are identified as the main crack types. The evolution of both crack types is determined by scanning electron microscope (SEM)-investigations and a simplified finite element method (FEM)-model. The results reveal that the initiation point of shear cracks is located at the surface. In contrast thereto longitudinal cracks emanate from second phase particles in the rim zone.
Akihide Saimoto and Prof. Ferri M.H.Aliabadi
F. Klocke et al., "Investigation of Surface Crack Types under Axial Compression Loading for a Case-Hardening Steel", Key Engineering Materials, Vols. 452-453, pp. 741-744, 2011