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Thread: Thiers Issard grades
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10-26-2006, 02:55 AM #1
I noticed a post in the venders section which has a blurb directly from Dovo about their manufacturing process and according to them they heat the metal to 1300 degrees (C I assume) and then use a special oil to chill the metal. Sorry but no lead hardening there.
No matter how many men you kill you can't kill your successor-Emperor Nero
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10-26-2006, 07:27 AM #2Originally Posted by thebigspendur
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10-26-2006, 08:21 AM #3
I think the heating is done IN the lead...
Nenad
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10-26-2006, 05:57 PM #4Originally Posted by superfly
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10-26-2006, 06:54 PM #5
Joe,
Although it melts at 850 deg. it can still be heated much higher than that. We use aluminum here for castings and although it melts at 1200 deg or so it can easily go far beyond that.
TonyThe Heirloom Razor Strop Company / The Well Shaved Gentleman
https://heirloomrazorstrop.com/
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10-26-2006, 07:09 PM #6
I love it when these threads take a turn into the realm of hard science of chemistry and physics. Whod'a thunk shaving could be so technical.
X
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10-26-2006, 07:52 PM #7Originally Posted by Tony Miller
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10-26-2006, 07:55 PM #8
So how exactly does this process work? Does it realign the structure of the metal?
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10-26-2006, 08:05 PM #9Originally Posted by Joe Lerch
After the blanks are formed, the blades are dipped in graphite oil, to prevent lead to stick to the blades, as mentioned before, and after that the blades are quenched in oil.
The video is showing cool blades dipped in graphite, and put in molten lead bath, which, as Tony mentioned, reach higher temperatures than 850C, which is the temperature the speaker mentioned as the "starting temperature"...
Nenad
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10-27-2006, 01:43 AM #10Originally Posted by Joe Lerch
In normal forging of blades the steel will be heated many times as it is shaped but it may not be at the initial solution temperature needed to start the real tempering process. Those first steps in the video look to me like othing more than the shaping and forging steps. I think the blade is then brought to the initial heat treating temperature in the lead bath as it provides a more stable atmosphere over heating in air. After the lead step the blade is likely quenched where it will have it's ultimate hardness. The temper is then drawn by heating to a lower temperature to add a little ductility to the steel which would otherwise be brittle.
I am sure Joe or Bill or Randy could chome in here with better details but this is it in a nutshell. Oddly though aluminum reacts exactly the opposite of steel. The freshly cast aluminum we make is soft. We solution heat treat it at 1000 deg for 12 hours, quench it in 180 deg water and it is dead soft and can be straightened (steel would now be at it's hardest). We then "artificially age" it in a 335 deg heated air oven for 3 hours after which it is harder and stronger, reaching it ultimate properties (on steel this would draw the temper and make it softer).
TonyThe Heirloom Razor Strop Company / The Well Shaved Gentleman
https://heirloomrazorstrop.com/