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Post by mrstabby on Jun 7, 2024 20:18:24 GMT
Not sure, how many of you saw this, just thought that some might not have seen it.
Pretty much as expected, but the T10 DH did fare better vs copper but worse vs the steel rod than the TH blade, I wonder how hard all of these were. Especially since Lancelot mentioned that many of his monotemper sinoswords actually had a softer spine - Sinosword having heat tret inconsistencies would explain why the DH sowrds did somewhat differently on the edge damage test.
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Post by toddstratton1 on Jun 7, 2024 22:08:44 GMT
Shadiversity posted this video recently as well. Testing the durability of a 3000 dollar differently hardened Katana, versus much cheaper monosteel blades. He is pretty controversial for swordtubers for various reasons, but there was interesting data in this video.
I am in Japan right now as well practicing with my Kenjutsu school in Tokyo, I used a Nihonto for cutting in class and on my bad cuts for the tatami the sword took noticeable bends which had to be fixed each time after. Easy to bend back, but that was the dojo beater nihonto which was bent many times before so metal fatigue kicked in.
Made me realize though that if I had my own Nihonto id be more reluctant to want to cut with it because I dont want to worry about bending it too many times, on top of the usual worries of a chipped or rolled edge.
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Post by mrstabby on Jun 8, 2024 9:18:14 GMT
I saw it as well, but I think Shad came in with a wrong idea. I always thought it was like this: A DH with a maximum hardness edge (60-65HRC depending on steel) but soft spine is tougher than a sword that's maximum hardness all the way through, not that the DH is tougher than TH in every situation. The TH Katana is only 53HRC while the 3k one is 65HRC edge and 35HRC spine. I think we would see a different result if the TH blade was 65HRC - but who would make such an abomination a frag grenade? ![:D](//storage.forums.net/forum/images/smiley/grin.png)
I think something you can see in both videos, the DH will break where the edge has a defect, and they all broke on spine hits, that would force open a crack from the edge.
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Post by Cottontail Customs on Jun 8, 2024 17:38:27 GMT
Shadiversity posted this video recently as well. Testing the durability of a 3000 dollar differently hardened Katana, versus much cheaper monosteel blades. He is pretty controversial for swordtubers for various reasons, but there was interesting data in this video. I am in Japan right now as well practicing with my Kenjutsu school in Tokyo, I used a Nihonto for cutting in class and on my bad cuts for the tatami the sword took noticeable bends which had to be fixed each time after. Easy to bend back, but that was the dojo beater nihonto which was bent many times before so metal fatigue kicked in. Made me realize though that if I had my own Nihonto id be more reluctant to want to cut with it because I dont want to worry about bending it too many times, on top of the usual worries of a chipped or rolled edge. videos like this are for entertainment value only, imho. I would take anything they say or claim with an enormous grain of salt.
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Post by larason2 on Jun 8, 2024 20:58:03 GMT
I agree that the harder the edge, the better DH would do to an impact that tends to crack a brittle blade. TH would otherwise be better though, all things considered.
It's true metal fatigue is an issue, but I think it depends on carbon content as well. Steel that's basically mild steel doesn't really work harden very easily (at least compared to materials like brass or aluminum), but it does depend on the thickness and the type of stress. The silicon containing spine of wrought iron/probably tamahagane also seems to help prevent failures when being bent. As soon as the steel gets any significant carbon in though, my understanding is that its easier to work harden when its still soft. So a sword made of carbon steel that is differentially hardened should be a bit less resistant to being bent back to shape many times. In practice though, I don't think this matters much. At least for my DH blades, I've bent them into shape a lot, and they still seem to hold together well.
There does seem to be a difference between tamahagane and carbon steel though. Tamahagane feels softer, and is much easier to bend and work with (in particularly to saw, it kind of flakes away). Hardened tamahagane is a bear though, it's super hard and very abrasion resistant. It seems to resist diamond tooling abrasion even better than hardened tool steel (takes longer to cut it). I feel like it heats up faster though, must be absorbing more of the kinetic energy somehow. Makes me want to get one of those really abrasion resistant steels to compare it to.
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