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Fracture morphologies of the AISI-4340 alloy structural steel specimen at high and low magnifications when the shot type is S230 and the diameter of the projectile is 0.58 mm: (a,b) fracture morphologies without shot peening, (c,d) fracture morphologies with a shot peening pressure of 3.0 bar and a nozzle movement velocity of 125 mm/min, and (e,f) fracture morphologies with a shot peening pressure of 1.0 bar and a nozzle movement velocity of 125 mm/min.
