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AEB-L edge thinness before heat treatment.
- Thread starter Cornwallis
- Start date
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- Apr 22, 2022
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- 41
Thanks. Personally, I like the look of a full flat grind with a small thickness behind the edge more than the slack-belt convexed look, and when I get a better grinder that’s how I will do more of my blades in this steel. I also think I pushed it as far as I should with grinding AEB-L before heat treating. Also, maybe I got lucky with a good batch of steel.
- Joined
- Aug 28, 2022
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There may or may not be..? There is if he don't temper again to reset the atomic bonds of the non-stable crystalline structure that is called Body Center Tetragonal from edge and or screw dislocations of BCT martensite which forms in layers, taking a ball carbide hammer to it will disturb the microstructure? In what way exactly I'm not entirely sure. As long as you would temper again depending on what temperature and alloy, I think that it could also increase tenacity?
The microstructure looks really decent so I think your heat treating and batch was annealed properly and you're doing a pretty damn good HT in my opinion from the microstructure. I also like that look better and the performance is not bad enough to justify a infinity grind in my opinion! GJ! I also agree you are at the limit of preheat treatment grinding; luckily AEB-L isn't that terrible to machine!
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DeadboxHero
Knifemaker / Craftsman / Service Provider
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- Mar 22, 2014
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- 5,385
Design a experiment, perform the testing, rule out may or may not with data.There may or may not be..? There is if he don't temper again to reset the atomic bonds of the non-stable crystalline structure that is called Body Center Tetragonal from edge and or screw dislocations of BCT martensite which forms in layers, taking a ball carbide hammer to it will disturb the microstructure? In what way exactly I'm not entirely sure. As long as you would temper again depending on what temperature and alloy, I think that it could also increase tenacity?
- Joined
- Aug 28, 2022
- Messages
- 9
I just plate quench and cryo thick or with angle iron so there are ways to avoid the issue?
Why don't you spend the money and time doing that if it's a problem for you?
Jeez. I wasn't being sarcastic I'm trying to help.
I would do it if it wouldn't just be buried on a forum post, also,.
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- Joined
- Apr 22, 2022
- Messages
- 41
I can thank Larrin Thomas for the data I used to determine heat treatment (and tempering).There may or may not be..? There is if he don't temper again to reset the atomic bonds of the non-stable crystalline structure that is called Body Center Tetragonal from edge and or screw dislocations of BCT martensite which forms in layers, taking a ball carbide hammer to it will disturb the microstructure? In what way exactly I'm not entirely sure. As long as you would temper again depending on what temperature and alloy, I think that it could also increase tenacity?
The microstructure looks really decent so I think your heat treating and batch was annealed properly and you're doing a pretty damn good HT in my opinion from the microstructure. I also like that look better and the performance is not bad enough to justify a infinity grind in my opinion! GJ! I also agree you are at the limit of preheat treatment grinding; luckily AEB-L isn't that terrible to machine!
- Joined
- Aug 28, 2022
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- Feb 16, 2022
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I would be really interested to actually see a test done that can show if there actually would be a problem caused by the carbide ball method of post heat treat straightening.
I know it would take someone with a lot more knowledge than I have, and probably 10 thousand dollars more equipment than I've got to really show with complete certainty that it's either not going to cause problems, or is overall detrimental to the knife, and if so, to what degree?
If someone ends up wanting to devote the time, money, and expertise to finding out, I would certainly be love to see the results.
I know it would take someone with a lot more knowledge than I have, and probably 10 thousand dollars more equipment than I've got to really show with complete certainty that it's either not going to cause problems, or is overall detrimental to the knife, and if so, to what degree?
If someone ends up wanting to devote the time, money, and expertise to finding out, I would certainly be love to see the results.
Britt_Askew
Knifemaker / Craftsman / Service Provider
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- Dec 9, 2010
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I peen to straighten and love it . I have had no problems but I havnt done it enough that would "prove" it works great all the time.
BUT ... JT has heat treated many knives for many makers here ( im guessing thousands of blades) and he peens to straighten. need more proof?
- Joined
- Feb 16, 2022
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- 615
I don't think anyone is saying that method doesn't work to straighten a blade.
What, I was saying I would like to see tested, is what the effects of the impacts from the carbide on the blade would be. If it's going to even have any measurable effect. Maybe it wouldn't make any difference at all for a small warp, and a bigger difference, if used to fix extreme warping. Maybe it doesn't matter at all.
In my understanding, peening with a carbide tip induces residual stresses in the blade that essentially push the blade straight. There should not be any stress risers left when you are finished with the blade because you grind or sand to the bottom of the peening marks. If you want to get an idea what kind of force the stresses from all the peening marks have to add up to in order to straighten the warped blade, put the blade on a surface plate with the concave side down so the middle of the blade does not touch the plate. Then, push on it with your little finger until the middle of the blade touches and ponder whether the force you just used could possibly have a detrimental long-term effect on the performance of the blade.
If you want to measure the effect of peening, you could try X-ray diffraction, but I think it will be a waste of time.
If you want to measure the effect of peening, you could try X-ray diffraction, but I think it will be a waste of time.
- Joined
- Aug 28, 2022
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I have an XRF and have(it's different but works kinda). It creates asperities. I don't believe that it would be much of a problem with low alloys but higher alloys I've personally proven it to myself. Period. I don't know what the effect is due to the tenacity of the steel exactly on low alloys, but anything with about 24.7% carbide or more I know with izod testing rig + JMatPro software. The effect of that without any recrystallization into the secondary hardening phase I don't know exactly but unnoticed izod testing has been all over the place so an educated guess is nothing good and that's with some recrystallization.. Personally, I just use thick enough stock and machine down even if I 100 belts die, but I'm picky. It's my belief that about 65% of all academic papers are.. I Don't know the word in English I want to say sort of like not correct but that isn't what I mean. Partially factual? I guess. Not complete? I think is best. I kind of am a nerd that plays with this stuff for fun. Just trying to help out, as wise men once said "I'm not sure about a God, but I know I am not God". I don't know what I don't know. If someone has an idea for testing better I would like to know please! Apologies for getting off topic OP!
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