Surface Residual Stress Optimization
The generation of compressive residual stresses in the material surface to improve resistance to cracking and corrosion. This is achieved through mechanical work-hardening methods.
Physical-chemical mechanism of action
Surface residual stress optimization creates compressive residual stresses in the material surface by altering the material structure through mechanical hardening methods. These stresses can be generated by processes such as cold treatment, forming, or heat treatment.
Metallurgical relevance & welding risks
Surface residual stress optimization increases the toughness and crack resistance of the material. This prevents stress cracking and improves corrosion resistance. However, improper handling can lead to unwanted stress distributions, resulting in cracks or deformation in the material.
Workshop practice & action items
To implement surface residual stress optimization in the welding shop, take the following steps:
• Cold treatment before welding: This creates compressive residual stresses and improves crack resistance.
• Forming the material: Mechanical stretching hardens the surface and creates stresses.
• Control the temperature during welding processes: Too rapid cooling can lead to unwanted stress distributions, posing a crack risk.