[TheForge] cryogenics

Mon Apr 1 10:10:05 2002

In some steels, cryogenic treatments convert the last remaining austentite
to martensite, allowing, sometimes, a point or 2 of hardness (Rc) increase
with no loss of toughness.

----- Original Message -----
From: "northwoods" <[email protected]>
To: <[email protected]>
Sent: Monday, April 01, 2002 6:26 AM
Subject: [TheForge] cryogenics

> I've heard a lot over the years on the subject of freezing knife blades,
gun
> barrels, and other assorted parts in an attempt to make them...better in
> some way I guess. What is exactly going on at the molecular level in a
piece
> of metal when this treatment is used? People have told me that they have
> done this to brake drums on vehicles and it has increased the wear
> resistance.
> Does freezing a piece relieve stress, also what else does it do and has
> anyone ever had any experience with the process?
>
> T. Clark
>
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