Why Shot Peening Extends Spring Fatigue Life
Fatigue cracks start at the surface. Shot peening introduces compressive residual stress that delays crack initiation.
Shot peening plastically deforms the surface layer to create compressive residual stress, refine the structure and reduce stress concentrations — significantly extending fatigue life of compression springs, disc springs and leaf springs. It is done after heat treatment, followed by low-temperature tempering, presetting and rust protection.
