Subject: Hard Data from Robb Gunters Magic Quench

From: [email-masked] (MR WILLIAM A HOCHELLA)
Date: Sat, 13 Jul 1996 11:34:58, -0500

To All,
Please read "Tool Steel - Seriously" first.
Being a Metallographer by first love, I have not come across the term 
"racked".
10% brine is not supposed to be used in a state resembling a slush 
puppie. Most heat treating refrences will actually say to heat up the 
brine to 60-70*F if it is cold. If you begin to freeze the water out 
of a solution what liquid remains is now higher in concentration of 
the solute. Has anyone had an "ice beer"?  Brine works best at 10%, 
not 20% or whatever in ice.
What was interesting about the test results was the increased 
resulting tensile of the Gunter quench over the brine quench. As I 
have previously stated the action of the wetting agents and 
detergents probably help when the solution wets the work. Austenite 
decomposition is a continous process. The surface of the work is 
cooled and transformed first. The faster you can get the heat out of 
the center of the work the harder the decomposition product you 
generate. The harder the average decomposition product is the highr 
the resulting tensile strength will be. The same thing happens with 
water vs oil vs air.

Hochewa

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From: "Steven O. Smith" <[email-masked]>
Date: Mon, 15 Jul 96 9:09:28 MDT

> puppie.  

> If you begin to freeze the water out of a solution what liquid
> remains is now higher in concentration of the solute. 

Excellent point. Franklyn--were there any results given comparing
Super Quench (the name I've heard) to room temp. brine?

--
Steven O. Smith
[email-masked]