If you liked this, you'd probably also enjoy this video[1] where a guy tests cryogenically frozen drill bits and explains (and shows via microscope) why they are so much stronger.
- It makes the drills harder, but as a result likely also more brittle, so they may only be "stronger" for certain applications
- Using the bit properly is much more important than what it's made of/whether it's cryo treated - he got an entire plate of steel with one bit with 30 m/min (and the bit was still good at the end) and then destroyed 7 bits, included some treated ones, on fewer holes than that using 40 m/min (I assume that's surface speed).
- This also means he didn't test how much longer the bit would last under good conditions, only that it was able to withstand non-optimal conditions longer. While it's likely that this transfers, it's not guaranteed.
That could have been interesting non-destructive scan with microfractured elements like this drill. They had them at uni. They had a third wire to ground after the test and some strange holding grip to prevent the whole setup from becoming a capacitor. One run took hours and you needed the 3d model of the object and thorough cleaning and sometimes sanding of the surface.