The Influence of the Velocity of a Peening Medium on the Almen Intensities and Residual Stress States of Shot Peened Specimen

Author:  Zinn, Schulz, Kopp, Scholtes
Source:  Conf Proc: ICSP-8 Sept. 16-20, 2002 Garmisch-Partenkirchen, Germany
Doc ID:  2002022
Year of Publication:  2002
Abstract:  
Authors Wolfgang Zinn*, Jorgen Schulz**, Reiner Kopp**, Berthold Scholtes* *Institute of Materials Technology, University of Kassel, Kassel, Germany **Institute of Metal Forming, Aachen University of Technology, Aachen, Germany Introduction Up to now, the properties of shot peened components and the reproducibility of the peening process have been assessed by the aid of the Almen test. The bending height of the Almen strip is a measure of the peening intensity, taking all peening parameters into account in an integral way. The Almen test, however, can only be applied offline and it is not unambiguously correlated with the resulting properties like, e.g. residual stress. Therefore, a system for direct measurement of peening medium velocity was used to determine the correlation between peening parameters including the mean shot velocity and the Almen intensity. For that purpose, specimens, made of the German steel grade 42CrMo4 were shot peened under different conditions and velocity distributions as well as resulting residual stress distributions were analyzed.