[WFTR]

I read an article about this technique about ten years ago, but I don't think the article explained the technical side of the process in any detail. In metallurgy, we've studied the effects of cooling metals from higher temperatures to room temperature extensively. We know about quenching and tempering starting at roughly ambient temperatures and sometimes down to around the freezing temperature of water. I've not heard of studies where they quench metals to crygenic temperatures and then study the microstructure. I think it would be a neat study.

I'm not immediately aware of a microstructural transition that would have a huge effect on a metal's wear characteristics, but if this guy's claims are legitimate, I'm assuming that his technique is affecting the tribological properties of the metals.

The whole subject is interesting, but I don't know whether it's real.

Bill

[ProudVet77]

Quenching and tempering work because the metal is still somewhat viscous (think glass viscosity) and the slower you cool it the structure of the produced material changes.
This stuff is pure silliness. Once the structure of the metal is set, lowering the temperature is certainly not going to change it.