New video on the way -- requesting feedback
Added 2024-03-20 16:43:17 +0000 UTCNew video coming out very soon -- there are a few changes and updates to make, but it's pretty close to final. Would really appreciate your thoughts!
Thanks,
Petr, on behalf of the whole Ve team.
Comments
I just love your detail in the sponsorship section! It sells the product well.
Jonas
2024-03-26 20:40:25 +0000 UTCAt 10:38 I guess he should have said "steel" instead of "iron"
Jonas
2024-03-26 20:20:27 +0000 UTCI learned about it in school so I don't know proper english terminology... E.g. copper can be hardened by working it cold. It becomes harder, but more brittle. It also loses electrical conductivity. The effect is completely reversible. You can relax the copper by heating it up to almost melting, but not quite. It becomes malleable again and a good electrical conductor. (Yes, I'm electrical engineer, not a material specialist). Because the effect of cold-working is completely undone by heat, I don't believe it comes into play here. When you heat the material up, the impurities on the surface burn off or melt off. When you hit it with a hammer while hot, the impurities just under the surface have a chance to escape. But those deep inside are there to stay. You fold the material ao that purer steel from the outside is buried deep inside while the impurities from the inside are brought closer to the surface.
Bartosz Błaszkiewicz
2024-03-21 10:51:39 +0000 UTCThe amount of carbon in steel comes from the pieces of steel used and is determined during smelting. It doesn't change significantly during later stages of processing (forgin, quenching, polishing...). The quenching changes how the carbon is distributed. You can't see it with naked eye, but the material is made out of grains. The carbon can get dissolved in grains or sit between them. But I knew this before watching the video so you may be right about it being confusing.
Bartosz Błaszkiewicz
2024-03-21 10:42:16 +0000 UTCI found the bit about using different kinds of steel for the blade and spine somewhat confusing. At first I thought he was welding two pieces of different carbon content together, but then you explain how the clay and quenching treatment causes the different types of steel to form in situ.
Chris Mullin
2024-03-20 23:29:04 +0000 UTCYou say that katanas are good because of the care attention that thay give to it. You know who else does that? Homeopaths and other quacks. That's why they still thrive. There are still people who hate that they only have 15minute doctor appointment and they have to be rushed through there. I'm not saying katanas are bad. (Although I do say that homeopathy is bad). But the care and attention does not make it good. Katanas were good for their times considering the materials that smiths had to work with. And I appreciate that there are people who preserve the tradition. But with all our scientific and technological breakthroughs we could make a better sword nowadays and there are people who do it.
Bartosz Błaszkiewicz
2024-03-20 19:44:37 +0000 UTCI googled around and they appear to be used in different context. "Strain hardening" I learned in engineering school and it is a measurable improvement in strength of a ductile material, like steel, as it is permanently deformed. That's the graph shown in the video I linked. This phenomenon occurs even if the steel is never folded. I saw a live demo of a bolt being pull tested to failure and the testing equipment measured the force applied as the bolt was stretched. I saw that graph generated in real time over the course of the test. "Work hardening" seems to be a qualitative description of the processes used to improve the strength of the steel. The folding of the steel is work hardening. Work hardening performs an amount of strain hardening on the steel, but it is not the only way to do so.
Kyle Nishioka
2024-03-20 19:44:23 +0000 UTCThe quenching does curve the sword a little, but it is not required. You could easily forge a sword with a reverse curve and the quenching would straiten it. The curve is ther because they liked it for whatever reason.
Bartosz Błaszkiewicz
2024-03-20 19:35:06 +0000 UTC20:00 where does the carbon escape to? The water? And it comes back from? You could make it clearer, that a blade is not one big crystal, but instead is composed out of a multitude of individual crystals. When you heat the blade the carbon dissolves in steel, but you cool it slowly it escapes to between the crystals. It's still in the steel, just not embedded in the crystal lattice.
Bartosz Błaszkiewicz
2024-03-20 19:32:06 +0000 UTCYes... differential hardening. Cool technique. Not needed on good, spring steel swords.
Bartosz Błaszkiewicz
2024-03-20 19:28:59 +0000 UTC"Some of the purest steel in the world" yeah... nope. Someone already commented on it, but this is just pure bullshido. You're not gonna beat pumping oxygen through molten steel. Industry FTW
Bartosz Błaszkiewicz
2024-03-20 19:23:17 +0000 UTCOh yeah. The iron sand. It is a high quality ore. As long as you collect it with MAGNETS Which they didn't have few hundreds years ago.
Bartosz Błaszkiewicz
2024-03-20 19:15:55 +0000 UTCI'm at 4:37 and I don't yet know what you will say layer but ai have to comment on you praising those swords so much. You should really work with someone more knowledgeable about swords in general. Like Metatron, Shadiversity, Scholagladiatoria, Matt Easton or Skallagrim to name just a few most prominent YouTubers. Japanese swords are impressive in how much they could work considering the poor quality ore that they had access to as well as general lack of resources on an island with isolationist politics. But their ore was of a poor quality and the tatara is a primitive smelting method compared to what we had in Europe at the time. European best quality swords were made out of spring steel (medium carbon content). Japanese catana had a spine of mild steel (low carbon content) and an edge of pig steel a.k.a. tool steel (high carbon content). Tool steel is hard so it retains an edge well, but it's brittle. The job of malleable core is to hold it together under strain. They wouldn't do it if they could reliably profuce satisfactory amounts of spring steel. Also, the mythical 1024 layers was done to purify steel. Europeans didn't need to do it as we had access to good quality ores. Also, bullets are usually made of lead which is relatively soft (for a metal). I'll post more answers to this post if I think of anything better.
Bartosz Błaszkiewicz
2024-03-20 19:12:38 +0000 UTCWonderful piece, with, as you’ve said, an incredible degree of access to the process. Most of my comments address the precise use of vocabulary appropriate to the trades involved. Rather than “mallet,” the correct term is “sledge.” The electric hammer is more properly a “drop hammer” or “power hammer.” The softer steel hammer-welded (a term which wasn’t explicitly used, but should have been) to form the cheeks of the blade which are applied to the outsides of the steel forming the cutting edge, is “cladding,” which is used both as the noun and as the verb which names the process of applying that softer (really, more shock-resistant) steel to the cutting edge. “Wet stone” is unfortunately too close in sound to “whetstone,” where the verb “to whet” is no longer in common use, and is widely confused with other stages of the sharpening process, and the English term that’s used for Japanese sharpening stones of this type is simply “water stones.” From the smelting part of the video, perhaps the vocabulary of “carbides” should be introduced to support the discussion of silicon/carbon inclusions in the repeatedly stretched and folded metal. Also, and this is only because consumers currently have access to high-quality Japanese domestic cutlery that is called “Damascus,” perhaps the difference between the processes might be worth a few moments. Because we are today several generations away from a familiarity with the processes used to make this sort of material, the terms “smelting,” “forging,” and “founding” might be briefly differentiated as well.
Paul Weiss
2024-03-20 19:01:47 +0000 UTCAt 14:48, Petr says "Some of the purest steel you can make in the world". Really? That seems odd to say. By what measure? Surely modern steel makers control the contents down to fractions of a percent of each alloying material, and don't have to toss 2/3 of their product.
Chris Mullin
2024-03-20 18:27:57 +0000 UTCThe YouTube channel "Primitive Technology" has been doing iron smelting for about a year. It's quite interesting & I recommend a quick skim by Veritasium. It dovetails nicely with some of the processes discussed in this new video (lead from waterborne bacteria, charcoal, slag, etc). https://www.youtube.com/@primitivetechnology9550/videos I never knew the reason why katana curve before now, so thanks for that inclusion.
Kimberly Green
2024-03-20 18:27:16 +0000 UTCIs 'work hardening' the same as 'strain hardening''?
Gregor Shapiro
2024-03-20 17:47:26 +0000 UTCI think you should add an explanation of strain hardening. This is related to the folding of the steel and why it makes steel stronger. Here's a clip of a professor going over the relationship of yield stress and the strain from deforming steel. https://youtu.be/UiYogITTl9w?si=aNU3CfFL7F9J2l43&t=99
Kyle Nishioka
2024-03-20 17:17:41 +0000 UTC
