Shot Peening
Shot peening is a mechanical surface treatment where compressive residual stresses are generated by bombarding with shot. This increases fatigue strength and prevents cracks.
Physical-Chemical Mechanism of Action
Shot blasting is a mechanical surface treatment process where a liquid or solid is bombarded with shot media (e.g., spherical hydrocarbon). This bombardment creates compressive residual stresses in the material surface, which affect the material structure.
Metallurgical Relevance & Welding Risks
Creating compressive residual stresses increases the fatigue strength of the material and prevents crack formation. However, too high stress levels can lead to surface wear or overloading the material, causing further defects.
Workshop Practice & Action Guidelines
To apply shot blasting successfully, precisely adjust the shot pressure and blasting speed. Excessive shot or too high speed can cause surface wear. Recommended compressive residual stresses are approximately 500 to 1000 MPa, depending on the material used.