Cryogenic treatment of drill bits: tested 2X lifetime and microstructure analysis

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:


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