iperdrastica quenching

[Aldebaran]

This is' a publication of Giannotti Elio iperdrastica about hardening.

http://www.gianottielio.it/documento.ph ... 1 & lang = eng

Tempering is a technique iperdrastica very interesting, but there are several difficult issues to overcome in the field of cutlery.

First of all, would a tank with an adequate system of agitation, which ensures vigorous movements and homogeneous fluid. In addition to reduced thickness, such as those that are used in cutlery, the heart of steel cooled so fast it cools fast enough and takes martensite structure.

This is, in my opinion, a problem, because it is difficult to be able to create a thermal gradient (between center and surface) to allow tensions to obtain the final overall compression (because, as I wrote, I still would take the heart structure martensite, even for low alloy steels with high hardenability not like C70 or 5160).

A blade subject (such as those Zowada http://www.ilrasoio.com/viewtopic.php?f=8&t=22-) subcooling temperatures of -30 degrees, in this case subira'una break.
Due to strong thermal shock, which should add to the tensions caused by the transformation martensitca and those due to thermal gradients between the heart and surface.

Keep in mind that speed off very fast leading to an increase in the amount of residual austenite.