Shot peening is a specialized cold-working surface engineering process designed to enhance the fatigue life and mechanical durability of metal components. By bombarding a metal part with thousands of spherical particles—known as shot—under strictly controlled kinetic conditions, shot peening introduces a layer of beneficial high-magnitude compressive residual stress at the component's surface.

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In demanding mechanical environments like aircraft engines, automotive transmissions, and industrial power generation, cyclical stress leads to micro-cracking and eventual structural failure. Shot peening acts as a primary defense mechanism against fatigue failure, stress corrosion cracking (SCC), fretting fatigue, and erosion, significantly extending the operational lifespan of critical load-bearing parts.

1. Shot Peening vs. Shot Blasting

While shot peening and shot blasting share similar machinery and delivery mechanisms, their fundamental metallurgical objectives, media standards, and process controls are entirely distinct.

                 TYPICAL RESIDUAL STRESS PROFILE

    Tensile (+)  |-----------------------------

                 |  \                         /  (Internal Tensile Balance)

   Stress (MPa)  |---\-----------------------/-------------------

                 |    \                     /

  Compressive (-)|     \___________________/

                 |   Depth below surface (mm)

• Shot Blasting is primarily a chemical-free cleaning, deburring, or surface preparation technique. Its goal is material removal, rust/scale removal, or roughing a substrate prior to painting or coating. The media used is often angular (grit) to scour the surface.

• Shot Peening is a precise metallurgical surface-enhancement process. Its goal is plastic deformation without material removal. The media used must be strictly spherical to prevent surface notch formation, and every process parameter—including velocity, media size, exposure time, and impact angle—is calibrated to induce a predictable compressive stress profile.