Quote Originally Posted by Frank S View Post
The Beilby layer is sometimes formed by air or work hardening due to heat, friction or percussion. The use of a sharp prick punch on the surface of a sample can also be used as a way to determine fatigue areas even where no apparent cracks are yet visible on the surface, where constant flexing has occurred over a long period of time.
Yes. I am well familiar with the concept, it was the name that I didn't know until today, thanks again.