Shot peening (Shot Peening) and old began in 19 century steel plate with a small hammer, made strong, plates of the vehicle was conducted more in the spring, etc..And then hardened in projecting a stiff Hardball to the product surface treatment (put the hardened and case-hardened), will have a higher residual compressive stress.Improvement of residual compressive stress improves durability and fatigue fracture.
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