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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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Having a problem
I am attempting to heat treat a blade of damascus, composition is 1095 and 15n20. I took the blade to 1450 and oil quenched but when I tested the blade it was only coming in at 42 rockwell. So I figured maybe I didn't soak it long enough, so I stuck the blade back in the kiln and again brought it to 1450 , then let it soak at between 1440 and 1460 for about 20 minutes, again immidiately quenched in oil. I tested it again and it was still registering 42 Rockwell. I then tested the tester with my calibaration black and it was fine.
So a couple of questions. Any suggestions as to what is happeninghere? Do I need to anneal the blade before I heat treat again? Should I try taking the blade to 1500, jus in case my thermometer in the kiln is off? Your help is greatly appreciated. Steve __________________ Stephen Vanderkolff Please come on over and check out my website. http://www.vanderkolffknives.com/ Thanks |
#2
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Hi, Steve.
I had the same problem when I tried to make a barlow blade using "Thunderforged Damascus" made in India. It has too much of that pretty nickle content. Nickle won't harden by heat treating. The best I could get was 54Rc, so I threw the blade away and used the rest of that piece as bolsters. Makes right pretty bolsters. |
#3
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You should be able to safely go to 1500F with this mix, the longer soak time is good. What kind of oil are you using? What is the thickness of the steel? 1095 needs to be cooled VERY fast.
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blade, knife |
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