Ultrasonic Cold forging?!

I don't know about you but, I haven't really thought I had enough electricity at my disposal to vibrate steel a decent quantity with enough force to actually change the crystal structure and cause it to have plastic deformation. maybe you do?
 
65535 said:
I don't know about you but, I haven't really thought I had enough electricity at my disposal to vibrate steel a decent quantity with enough force to actually change the crystal structure and cause it to have plastic deformation. maybe you do?
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Huh? I guess maybe YOU think someone would do this at home. I would think you would only do this process at home after you got your bedroom friction forging machine completed.
 
"plastic deformation to a material SURFACE " This is akin to shot peening which also strengthens the surface layer.And they've got the right buzz word NANO-crystal .
 
Yes, in the sense that it decreases grain size through plastic or steady-state deformation it is similar to friction forging, though friction forging uses a much more radical deformation. Would it be logical to assume that the ultrasonics would penetrate deeper into the material than traditional shot peening? Since it was used on an industrial knife edge I assume the ultrasonic "peening" can penetrate to a level sufficient to allow its use for knife edges. The question is if the improvement to the mechanical properties justifies the expense of the process. I assume it would first have to be accepted for other practical uses in industry before it would be available to the knife mfg's.
 
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