Relationship between metal fatigue and stress hardening

[Ken S]

I don't know how applicable this, however, when a woodworker's hand scraper is sharpened, the burr is added with a burnisher. After the burr becomes dull, the old burr is filed away, being considered as fatigued metal.

I once read or saw where someone filed away a knife edge to start again with unfatigued metal.

This is an interesting topic; thanks for starting it.

Ken