[TheForge] Harden & temper

[peter fels]

Quenching in a pressurized vessel to rise the boiling temperature?
 
On Jun 17, 2011, at 10:32 AM, Jerry Frost wrote:

> Salts and caustics also raise the boiling temp of water.
> 
> As I read the part of the article I could, I gathered the benefit of this 
> type of heat treat process is it yields a tough yet malleable result.
> 
> Of course I could've missed something, I skimmed the article and got 
> distracted by graphenes. <sigh>
> 
> Jer
> ----- Original Message ----- 
> From: "David E. Smucker" <davesmucker at hotmail.com>
> To: "Blacksmithing List Sponsored by ABANA" <theforge at mailman.qth.net>
> Sent: Thursday, June 16, 2011 6:29 PM
> Subject: Re: [TheForge] Harden & temper
> 
> 
>> All quenching with a water based quenchent above 212 F is based on the
>> physics of flashing water to steam.  For this to be really fast we must
>> prevent a stable steam film insulating the surface.  This is what brine
>> does, this is what a caustic solution does, this is what "super" quench 
>> does
>> (there is nothing "super" about super quench), this is what high velocity
>> sprays do.  All of the above are very close to twice as fast as still 
>> water
>> with limited movement of the part.
>> 
>> In sheet applications, (continuous web moving in a process line), plain
>> water sprays are hard to beat on an effective cost bases.  If we are 
>> making
>> auto sheet -- there is no other bases than cost.
>> 
>> Dave Smucker
>> 
> 
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