Effects of Severe Plastic Bulk and Surface Deformations on Fatigue Performance of cp-Cu

Author:  Sin, Janecek, Wollmann, Wagner
Source:  Conf Proc 2011: ICSP-11 South Bend, IN USA (pgs. 311-316)
Doc ID:  2011052
Year of Publication:  2011
Abstract:  
Abstract The effect of severe plastic surface deformations by shot peening (SP) and ball-burnishing (BB) on high cycle fatigue (HCF) performance of commercially pure (cp) -Cu is compared with that after ambient temperature plastic bulk deformation caused by rotary swaging (SW), equal channel angular pressing (ECAP) and wire-drawing (WD). It is shown that shot peening (SP) and ball-burnishing (BB) result in near-surface microstructures very similar to those after severe plastic bulk deformations. Accordingly, high-cycle fatigue (HCF) performance which is dominated by surface and near-surface properties is much improved by SP and BB and hardly different from that after severe plastic bulk deformation. As opposed to the observed microstructural refinements and work-hardening, residual compressive stresses as also induced by SP and BB are of minor importance in HCF of cp-Cu. Keywords: Cp-Cu, severe plastic deformation, grain refinement, micro-hardness, fatigue performance