CONTROLING SURFACE ROUGHNESS THROUGH SHOT MEDIA SIZE DISTRIBUTION

Author:  David Bahr1 and Siavash Ghanbari1 1 Center for Surface Engineering and Enhancement, School of Materials Engineering, Purdue University, West Lafayette IN USA
Source:  ICSP14 Milan
Doc ID:  2022092
Year of Publication:  2022
Abstract:  
Abstract A simulation has been developed to predict the surface roughness profile and residual stresses as a function of media size distribution and shot velocity on steel samples. The simulation was validated by direct comparison to Almen strip tests. The simulation probed shot peening tests with different shot sizes and peening conditions such as individual impacts, sequential impacts, and mixed (i.e. concurrent) impacts. The simulation results are compared with experimental outcome measured by optical profilometer and x-ray diffraction in published experimental tests. Using a mixed size distribution of shot, rather than sequentially peening with larger and then smaller shot, appears to provide a smaller surface roughness than peening with larger shot alone, while providing a surface roughness similar to that with a finer peening size. Keywords Roughness, hardness, shot size.