A Simultaneous Method Of Impart.compres.stresses On Var.substrates While Maint.surface Integrity

Author:  Joersch, J. F. and Neal, J. W.
Source:  Conf Proc: ICSP-1, (p.649-662)
Doc ID:  1981002
Year of Publication:  1981
Abstract:  
The investigations include the equipment and processes developed for the purpose of imparting compressive stresses in substrates while maintaining smooth surface finishes, particularly on gas turbine engine titanium airfoils. The equipment utilizes gravitational forces as an accelerant in a peening process. The kinetic energy contained in the peening media is closely controlled by requiring the media to pass through a labyrinth prior to falling on the substrate from specified heights. By using large (1mm to 2mm) hardened and polished steel balls as a peening media, surface finishes of less than 15AA microinches are obtained while peening in the range of 0.25mm to 0.38mm Almen "N" shot peening intensities. Descriptors: Shot peening; Finishing; Titanium; Airfoils; Compressive stresses; Fatigue life