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Post by Deleted on Sept 14, 2008 1:21:09 GMT
hi, maybe I just forgot it in the overwhelming quantity of new information I learned in the few days I've been here, but I still don't understand... what is the difference between DH and TH? is it quenching? or forging? I don't remember...
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Post by Deleted on Sept 14, 2008 2:02:50 GMT
It's in the quenching. TH = through hardened, DH = differentially hardened.
Hope this helps!
Cris
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Post by Deleted on Sept 14, 2008 2:33:38 GMT
just to go into a little more detail.... DH is when clay is applied and to the back and spine of the blade then heated and quenched ( this produces a hamon, harder edge and softer spine). though harden is the blade is the same hardness all the way through... hope this helps
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Post by Deleted on Sept 14, 2008 3:27:00 GMT
ok, so in DH, clay is applied to back only, in TH no clay is applied
furthermore, DH, visible hamon, TH not much of a hamon
right?
also, what are the practical differences? DH seems to be more resistant to stress of impact, but there must be advantages to TH too, no?
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slav
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Post by slav on Sept 14, 2008 3:34:36 GMT
Yes. DH blades have a real hamon, while TH blades usually have a fake hamon that is either wire-brushed or etched (frosted) into the edge.
The practical differences all depend on the actual blade, and really can't be quantified. Originally (in the old days), blades were DH because a TH blade is too brittle and shatter-prone. With DH, only the edge is brittle, but the body of the blade is still soft and somewhat flexible.
Nowadays, our steels are much more improved. And especially with silicon alloy/spring steels, general consensus is that TH are stronger overall (while still being flexible to-boot) while DH blades tend to bend and take a set more easily.
But it all depends on the particular blade, and the skill of the user.
I prefer DH because it is more traditional, and I like real hamons.
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Post by Deleted on Sept 14, 2008 5:58:54 GMT
I prefer DH because it is more traditional, and I like real hamons. Me too slavia =). Your James Raw blade for example...incredibly beautiful. Hopefully my knives (and swords, one day) will begin to develop a more visible pattern. Could have been the etchant though...I need to pick up some ferric chloride. To the original poster, if you look on my 'first knife' thread below this one, you'll see how I used a clay (more like mud...but it had clay in it!) coating to draw a pattern on my knife. You can also see the crappy hamon it produced lol (not the fault of the process...call it, operator error coupled with crappy steel). Also, sorry for the 'post and run' earlier...the wife was on me about getting to the grocery store lol. Cris
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Post by Deleted on Sept 14, 2008 13:49:04 GMT
I prefer DH because it is more traditional, and I like real hamons. As long as we are talking japanese blades atleast, because Europeans had been through hardening steelfor just as long.
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slav
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Post by slav on Sept 14, 2008 16:16:58 GMT
True, true.
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Post by Deleted on Sept 14, 2008 18:28:58 GMT
I prefer DH because it is more traditional, and I like real hamons. As long as we are talking japanese blades atleast, because Europeans had been through hardening steelfor just as long. True...so traditional doesn't quite cover it. Guess we just like hamons lol. I mean, take a look at this: I know it's a yari, but the smith could easily have drawn out a tang, and voila: Western longsword. Functionally, well...as has been said, with todays steel TH are generally stronger and more durable. But imagine the above 'sword' if it were forged as a Howard Clark style martinsite/bainite blade? Best of both worlds =). Cris
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Post by Deleted on Sept 14, 2008 18:49:28 GMT
wow that is nice! i really dont care if something has a hamon or not im all about functionality.
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Post by randomnobody on Sept 14, 2008 21:09:55 GMT
Depending which angle you're coming from, a hamon plays a huge role in functionality.
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Post by Deleted on Sept 14, 2008 23:59:34 GMT
Depending which angle you're coming from, a hamon plays a huge role in functionality. Please elaborate?
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Post by randomnobody on Sept 15, 2008 0:08:07 GMT
It was a light toss to the idea behind the differential hardening, to provide a harder edge for "superior" edge holding and retention, while maintaining the softer spine et cetera you know the routine. Depending on one's preferences this lends a good deal to whether a sword "functions" the way it should, and if we're discussing Asian blades, a good many were historically DH for the whole "functional" aspect of the treatment. Euro swords are different stories, granted, thus if you're looking at it from the European angle, it really doesn't matter. Likewise a number of modern samoorye like their samoorye sordz TH because they're afraid of them breaking or something, which they inevitably do anyway. Hence, "depending which angle you're coming from." I personally feel that certain blade types benefit from being DH, and others don't. In my mind, also, the simple aesthetics of a hamon play a large role in the "function" of being pretty. Again, "depending which angle." Am I clear yet? I tried.
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Post by Deleted on Sept 15, 2008 1:01:22 GMT
yup, to the point
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