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 - http://sci-hub.tw/10.1007/s00170-011-3616-8 Performance of cryogenically treated HSS tools - http://sci-hub.tw/10.1016/j.wear.2006.01.017 Effects of Cryogenic Treatment on the Strength Properties - http://sci-hub.tw/10.1088/1757-899X/229/1/012014 LN2 generator video: /watch/s8DhqWSEWP7Eh Heat treatment of steel video: /watch/oWTVsDxCfluCV Source of drill bits: https://www.mcmaster.com/catalog/125/2508 Temperature logger (discontinued, unfortunately): https://www.adafruit.com/product/3081 3M fine polishing pads: https://www.amazon.com/Tri-M-Ite-Polishing-Abrasive-Assorted-Sheets/dp/B07CP9CCH4/ Delorean patent on cryogenic torsion bar: https://patents.google.com/patent/US4378658 Steel grain structure inspection, and overall great channel for material analysis: /watch/wY04WNfoHuUo4 Steel grain structure video: /watch/4AxHBs2rIS0rH Applied Science on Patreon: https://www.patreon.com/AppliedScience

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