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#1
08-25-2003, 06:54 PM
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What caused this?
This is O1, normalised and annealed then polished to 1000 grit before HT.
QUenched in warm peanut oil the tempered x2 at 400 F. THEN placed in the freezer for two days before a final tempering for 2 hrs. I re polished to 1000 grit before etching and could clearly see a hamon line whick looked as if it was slightly raised? WHen I etched , this is what happened...  This is a close up...  ANy ideas why this happened? Thanks Kevin. Last edited by Coutel; 08-25-2003 at 08:08 PM. 
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#2
08-25-2003, 07:51 PM
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Dunno what caused it, but if it's structurally sound, I like it.
 ;D
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#3
08-25-2003, 08:00 PM
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Cannot fathom the reason why, but it sure looks cool.
Ken Beatty __________________ Ken (wwjd) http://www.wacoknives.com "One Nation Under God"
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#4
08-25-2003, 11:27 PM
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alloy banding
Looks like you have alloy banding in your blade. I have seen
another 01 blade someone made with it. Alloy segregation can be induced by various means, but I am guessing in your case, it is due to the thermal cycles of your forging process.
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#5
08-25-2003, 11:31 PM
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Kevin,
In one of my first knifes (O-1), I got the same type of thing at the very tip.  I had been thinking that since this would have been the part of my blade that was the hotest, maybe if O-1 is taken hotter than non-magnetic before quench, it behaves differently. On this blade, the edge seems to be uniformly hard, and it holds a great edge. It would be worth playing with more. By the way, this was finished to 1200 grit, etched, and sanded with 600 grit. Vegtable oil quench, double temper, no freezer. I'm not sure how to repeat it, but I do like the look, maybe we can figure it out. --Carl
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#6
08-25-2003, 11:56 PM
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"Ghosts" in the steel.
I see it when I'm filing a normalized blade. The hardness of the file differentiates between areas in the grain, and it shows up looking like the same grain or banding you have. After I heat treat and finish the blades the "ghosts" disappear. :confused: I have always wondered how to get them to show and figured it might have something to do with the heat treating.
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#7
08-26-2003, 12:46 AM
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Real nice looking blade shape Kevin.
__________________ "Many are chosen, but few are Pict" "The doer alone, learneth" NT Neo-Devo 
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#8
08-26-2003, 12:08 PM
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would this effect be detrimental to the structure of the knife? Enquiring minds need to know.
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#9
08-26-2003, 02:30 PM
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Looks good, whatever it is
 Roger
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#10
08-26-2003, 02:34 PM
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I know Kevin's worried about having over-heated this blade but that doesn't look like O-1 that's been overheated, and I've done that a few times
 O-1 can suffer grain growth, the nice gentlemen in this very forum have explained that to me whan I've shown pictures of the failures, but I have never seen that effect. Besides, that grain growth seems to happen with holding the steel at a high temperature for too long. Now let's hear some more expert opinions instead of mine Roger
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#11
08-26-2003, 06:18 PM
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Perhaps kevin has happened accross the holy grail - a magic heat treatment. Now all we need to hear is that the blade will bend 90deg back on itself, spring back into it's former shape, and cut like a witches tongue.
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| blade, forging, knife |
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