Re: [EVGRAY] Dotto Ring

Body

Hello Mick my friend, from what I have learned of the difference is, quenching is when you cool a solution treated steel quickly enough that carbides do not precipitate out of solution in a stable way.The work hardened metal is heated to a temperature which is about half its melting point. The grains within the structure re-crystallise into many fine grains. The temperature at which the new grains begin to grow is called the re-crystallisation temperature. In the new structure dislocations can move more easily. The metal therefore becomes softer and more malleable and ductile. When a metal is being shaped by cold working, it may be necessary to anneal it several times during the process. Tempering is when you take that quenched steel and heat it enough to begin precipitating the carbides but not enough to put everything back into solution. Quenched steels are brittle and tempering toughens and hardens them. The reason and process of re-heating work hardened steel and other metals is to make it more malleable and ductile ... hope this helps.
 

    On Friday, March 23, 2018, 5:25:45 PM PDT, Mick [email protected] [EVGRAY] <[email protected]> wrote:  
 
     
 

Darrell,
 
Isn't quenching for hardening or is it also used in anealing?
 
 
 On 3/23/2018 1:28 PM, [email protected] [EVGRAY] wrote:
  
    
Hi Norman my friend, It's been my experience in the past when I was into heat treating metals, that you really don't need to go cherry red, just heat it up ( propane torch) until it turns a nice solid gray color. Then quench it, No need to cool it slowly either. Worked for me.
  
 
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