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Heat Treating and Metallurgy Discussion of heat treatment and metallurgy in knife making. |
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#1
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Carbon Absorbtion
Could anyone tell me at what temperature pure iron would absorb carbon?
Thanks __________________ I am smiling |
#2
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Carbon Absorbtion
Carburizing is normally carried out in the temperature range of 1500-1750F, depending on the alloy and the desired case depth. Key to getting the carbon going into the iron instead of coming out of the iron (decarburization) is maintaining a high carbon potential around the iron. In commercial applications, it us usually done with a carbon rich atmosphere that is created inside the furnace. Bladesmiths and blacksmiths usually use pack carburinzing. I assume you are using this technique and are familiar with how to do it. Carbon diffuses at the rate of about .006" per hour at 1700F.
__________________ Which is worse; ignorance or apathy? Who knows? Who cares? |
#3
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What packing media would you suggest Bob? I'm thinking about using coal dust or maybe graphite. Anybody have a box of fullerenes laying around?
__________________ I am smiling Last edited by Mark Williams; 07-18-2004 at 10:20 AM. |
#4
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Quench said: "I assume you are using this technique and are familiar with how to do it"
Mark probably is, but I'm not, would like to hear about it. Also, I recently bought some 4600 powder, and was told to get the carbon content up in it, to add some graphite. This powder will be used in a canned mosaic process. Is this along the same lines? |
#5
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Pack Hardening -
Quote:
To increase carbon add bone meal - availabel at any garden/hardware store. Bob/Quench - in the previous post I made on color case hardening they specifically state to stay below 1350F????? __________________ Chuck Burrows Hand Crafted Leather & Frontier Knives dba Wild Rose Trading Co Durango, CO chuck@wrtcleather.com www.wrtcleather.com The beautiful sheaths created for storing the knife elevate the knife one step higher. It celebrates the knife it houses. Last edited by Chuck Burrows; 07-18-2004 at 10:47 AM. |
#6
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Pack Carburizing
I gotta plead ingnorance here. My experience with carburizing is entirely limited to gas carburizing in an industrial application. I cannot give good information on pack carburizing with bone meal in a home furnace. I will see what some of my books have to say about it but this may be one of those technologies that is mastered only by a few diehard smiths.
Pay no attention to man behind the curtain....! -The Wizard of Oz. __________________ Which is worse; ignorance or apathy? Who knows? Who cares? |
#7
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I've done some pack carburizing before. Powdered charcoal or graphite will work. We used a box with a removable lid that we sealed with a clay/satanite type mixture. First we put a layer of the charcoal in the box, then the parts to be carburized, then more charcoal. Main thing is that the piece is entirely covered by carbon rich material. Put the lid on and seal it. Heat the whole thing to 1700 degrees and hold it there. We were shooting for a penetration of about .070 inches, so it was held for about 10 hours.
Jamie __________________ Jamie Boley Polar Bear Forge - Custom Blades www.polarbearforge.com jamie@polarbearforge.com |
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