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Shot Peening

To prevent stress cracking corrosion and fatigue

Shot peening results in compressive stress in a surface layer of about 200 µm. This stress can be quantified using X-ray diffraction.

In the figure an example has been given for stainless steel 316. The compressive stress is clearly visible with the expected relaxation at the outermost surface layer.

Many corrosion phenomena like stress induced corrosion cracking and corrosion fatigue are initiating due to tensile stress in the surface.

It is clear that a compressive stress as a result of micropeening will strongly diminish these corrosion phenomena.