I bought some HSS stub drills, and treated half of them with liquid nitrogen, which improved their wear resistance dramatically. I also look at the change in microstructure with an electron microscope.
Performance of cryogenically treated M35 HSS drills -
Performance of cryogenically treated HSS tools -
Effects of Cryogenic Treatment on the Strength
Properties -
LN2 generator video:
Heat treatment of steel video:
Source of drill bits:
Temperature logger (discontinued, unfortunately):
3M fine polishing pads: /
Delorean patent on cryogenic torsion bar:
Steel grain structure inspection, and overall great channel for material analysis:
Steel grain structure video:
Applied Science on Patreon:
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