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Tool Talk Discussion Forum

Re: School me on Quench Temper

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Author  [Modern View]

03-16-2013 14:22:52

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I posted a link to some basics....some of the fault with using water to quench is that it creates steam bubbles around the piece you are quenching and doesn't cool as quick as is preferred....I usually use water and keep the piece moving quickly while immersed. Metallurgy is quite a vast subject and you should cover some of it in your welding classes. Quenching will harden the work and tempering is an additional process to relieve the brittleness created while hardening. When you temper, you will be watching the colors as they change in the piece you working on. Different colors for different functions of your finished piece. I will look for a color chart and post that link in another post.

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Eric in IL

03-16-2013 15:27:19

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 Re: School me on Quench Temper in reply to Rickieblue, 03-16-2013 14:22:52  
An old timer once told me to quench moving the workpiece briskly in a "figure 8".

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03-16-2013 14:33:55

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 Re: School me on Quench Temper in reply to Rickieblue, 03-16-2013 14:22:52  
Here is a color chart link....when making a chisel I would run the colors until the cutting edge was purple..if tempering a lathe bit, I would run the colors until it was straw colored. Everything will be tempered to a different color, just depends on the hardness desired. The really hard things like a lathe bit will shatter if it is smashed and of course a chisel you don't want to shatter as you are using it. The brittleness goes away with the higher temperatures you temper it at...and as you look at the chart..the further you go past the yellow and towards the blue. One thing I noticed on the last link I posted is that they were not quenching after running the colors..I always quench at that step to stop the running colors. When you run the colors, use minimal heat, as it is easy to go past the color you want!

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Brad Buchanan

03-17-2013 09:16:25

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 Re: School me on Quench Temper in reply to Rickieblue, 03-16-2013 14:33:55  
Great link.

Lots of interesting stuff on that site.


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