Latest development in the high performance 52100 blade

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The image below shows a wootzy pattern below the quench line in my latest bowie. You can click through the picture to view higher-resolution image.



Further pictures of the knife are available for viewing in the following directory: (link)

Oftentimes, when a crack in the edge forms, it propagates up the blade towards the spine. It is hoped that the band of wootz in the knife may slow or stop this propagation.
 
There needs to be a little drooling smilie face. That is singularly one of the most beautiful pieces of steel I have ever seen. I hope it gives the performance you are looking for out of it too!
 
I'm glad to see the crack fairy visits legends also. :)

So what does the crack mean in relation to the steel itself. Have you reached the performance plateau with the 52100?
 
Ed Fowler said:
The image below shows a wootzy pattern below the quench line in my latest bowie.
O.K. this part is pretty cool and I understand...

Ed Fowler said:
It is hoped that the band of wootz in the knife may slow or stop this propagation.

...but now I am confused (not too hard to do ;) ), is this a complete 52100 blade with banding, or did you weld a band of actual wootz in there? It would indeed make an interesting pattern if one did.
 
Mark: the cracks we are working on are the ones that come after several (4 to 12) 180 degree flexes. Sometimes these hardened edge cracks raise to the first transition zone and bifurcate, with some splitting along the internal martensitic cone. This wootz area should stop that. I kept pretty close records of the thermal cycles and how it was accomplished.

Since this one was the first one to demonstrate this complete wootz like form of steel from ricasso to tip, I decided to let her stand as my best effort to date.

She has stolen my heart and since we do not have a laboratory to help read the blade at this time, destructive testing seemed rather impractical. If I can do it again, we will experiment further.

This blade was capable of over 1,000 cuts on the rope and did 10 edge flexes without a chip. I know she would have done plenty of 180's, just did not have the heart for it.

I do not know if there is a plateau, we have tried to find the limit, I strongly believe the only limit this steel knows is our ingenuity and effort.

Djolney: I have no information on 52100b, if I ever learn this steel I will try others.

Roughedges: Thank you for the kind words, there has been a lot of time and effort on the part of over nine men that all contributed to bring this blade to life. The more who join the high performance team, the greater our potential.

I took her to the Blade Show and will have her at Blade Show west for those who are interested to get to meet her.
 
Kevin: Evidently we were both posting at the same time, I did not mean to ignore your post.

The wootz zone was developed via many thermal cycles, it is a natural event developed out of one homogenous piece of our 52100. I have seen the wootz in our blades before hardening, but always lost it in hardening. This time I walked a thermal tight rope on the hardening cycles and aced it. At least that is the way it looks at this time.
 
Ed that is awsome! That has got to be the most beutiful piece of steel I've ever seen.
 
Ed, what more can you tell us of your thermal cycling? Beauty of a blade....
 
Neat. It looks kinda wootzy but... is it wootz?

I guess I'm still a little unsure as to what exactly that pattern reveals.
 
Ed Fowler said:
Kevin: Evidently we were both posting at the same time, I did not mean to ignore your post.

The wootz zone was developed via many thermal cycles, it is a natural event developed out of one homogenous piece of our 52100. I have seen the wootz in our blades before hardening, but always lost it in hardening. This time I walked a thermal tight rope on the hardening cycles and aced it. At least that is the way it looks at this time.

No problem, thank you for trying to clear up my confusion. But I am still a little lost, I think it is just the wording and terminology that is throwing me here. "Wootzy looking" and "Wootz like" are great descriptions that I understand. That stuff can be great fun to play with, and 52100 has the alloys and carbon to get all kinds of banding when you play with heat. You can even manipulate the pattern enough to make designs or write your initials in the structure, as I did in this example that has been well used on other forums over the years:
funwooz1.jpg

funwooz3.jpg


It was a piece of scrap 52100 bearing race that I was messing with one afternoon, I never took the pains that you have to make it into a well made knife. It is indeed wootzy looking since many of the underlying causes of the patterns are similar to the patterning in real wootz, but wootz would be an entirely different product of a specific crucible manufacturing process, whereas alloy banding occurs in almost any alloy-rich hypereutectoid (and even some hypoeutectoids) when temperature allows enough carbon to get grabbed by those alloys (not that I am breaking any news to you, but I thought it good information for others interested in the process.)

When you referred to it as "wootz", instead of "wootz-like" or alloy banding, I became confused as to whether you had folded in a bar of the real thing (wootz) or simply thermal cycled the 52100 until it banded. Thank you for the clarification, I didn't want to draw entirely false conclusions about the beautiful work you have shared images of here. Well done. :)
 
I have a bar of wootz like steel that was sent to me to work with, it was made from 52100 bal bearings just like the wootz of history. Still contemplating how to work it up, waiting to get ahold of the man who made it.
Without our Lab. it is hard to tell what we have other the visual effects.
I will try to write it up, it will take some time and we have another seminar coming up tomorrow, but I will write up the entire process.

Kevin: thanks for the compliment, I have been wanting to get where this blade is for over 30 years.
 
ZDP-189 said:
I have a bar of wootz like steel that was sent to me to work with, it was made from 52100 bal bearings just like the wootz of history.

They had 52100 ball bearings in Persia during the seventeenth century? Sweet! No wonder their blades performed so well! :D
 
Wulf said:
They had 52100 ball bearings in Persia during the seventeenth century? Sweet! No wonder their blades performed so well! :D


BAHAHAHAHAHAHAHAHA!!!! ROTFLMAO!

More proof why it's so senseless to use modern technology in the bladesmithing shop.
 
I got to see that one at Blade and it is a beauty - the action of the banding in the blade is quite mesmerizing. I was a bit confused by the description of a "wootz band" - but I think that has now been clarified. Once again - really beautiful knife.

Roger
 
Kevin R. Cashen said:
No problem, thank you for trying to clear up my confusion. But I am still a little lost, I think it is just the wording and terminology that is throwing me here. "Wootzy looking" and "Wootz like" are great descriptions that I understand. ...It is indeed wootzy looking since many of the underlying causes of the patterns are similar to the patterning in real wootz, but wootz would be an entirely different product of a specific crucible manufacturing process, whereas alloy banding occurs in almost any alloy-rich hypereutectoid (and even some hypoeutectoids) when temperature allows enough carbon to get grabbed by those alloys (not that I am breaking any news to you, but I thought it good information for others interested in the process.)

When you referred to it as "wootz", instead of "wootz-like" or alloy banding, I became confused as to whether you had folded in a bar of the real thing (wootz) or simply thermal cycled the 52100 until it banded. Thank you for the clarification, I didn't want to draw entirely false conclusions about the beautiful work you have shared images of here. Well done. :)


Okay, just a comment from the peanut gallery... I was, like Kevin, kinda confused by the terminology as I understood "Wootz" to be an actual form of steel formed through a particular process as Kevin pointed out.

However, in this case, maybe what Ed has done is the same thing many early Japanese swordsmiths did through their manipulation of the forging and heat treating processes... The Japanese then developed a rather refined set of terms to describe each of the different effects that were achieved in the smithing process... Which exact term is appropriate for what Ed has encountered, though, is way beyond me.

Which term is appropriate might be better answered by the likes of Michael(?) Bell in Oregon who makes traditional style Japanese blades in the original manner of the traditional Japanese swordsmiths - He may know the correct term for this effect, if there is one Japanese term for it...

Otherwise, I have several plain carbon steel blades from several makers that show more than just the simple transition between two crystaline structures (the hamon) - I've got shadow hamons (kind of like the false rainbows that exist on either side of the most visible rainbow) and several different grain patterns, both above and below the hamon, that are characteristic of several of the effects that the Japanese have named... none, however, show as distinctive a marking as what Ed has produced...

All that being said, I don't really care what the correct term is... That blade is just plain beautiful and I would really like to see it close up to truly appreciate the life that Ed has breathed into that piece!!! :eek: :D

Ed, even though we haven't formally met (your table is always three and four deep when I swing by in Eugene! LOL!!!,) I've read most of the threads you've been involved in that go into your pursuit of totally understanding the life of one particular kind of steel; I've read your articles in the mag's about your philosophy, (heck, you even invited me to stop by on my cross country trip last year!!)... I may never be able to afford one of your blades, but I have learned way more than I could in any book from you about your style of knives, your way of approaching knifemaking, and, what actaully happens in the steel itself from your totally unselfish sharing of your experiences and knowledge... And I think most of the folks on this thread (and on this forum) seem to be cut from some of the same cloth - everytime one of you shares with the public like this, you demonstrate the true values of this community...

Thank you.
 
The term or word band was a bad choice, zone would maybe fit better. I would love to take her apart and see what happened and how strong and tough she is. I don't want to destroy her until I have a few like her or better and we have Rex back in the Lab.

I most sincerely thank you for your kind comments and today feel a stronger sense of community building.
Thanks Friends

The log on stuff is Dan's, this message was written by
Ed Fowler, as soon as I can figure how to get back to my own name I will do so.
 
I just had to jump in here. I love that effect on the blade, primarily because it looks interesting. I have been getting similar effects with my current method of heat treating on 1095 and 1084 steels. I have been TOLD that the pattern is some sort of structure similar to bainite and is a really good thing in terms of blade toughness and strength. However, I have not tested the blades myself to see if it offers any performance advantage in the bend tests, and my entire purpose of doing this was entirely to produce what looked like grain activity normally associated with folded steel Japanese blades. Here is a closeup of one of my recent blades - the patterning is less dramatic than on Ed's blade but I think it may be the same thing ...

orig.jpg


Just a little research of my own, on the side, I might add... inspired by Ed's constant search for the Holy Grail of steel performance. Jason.
 
Ed,
Thanks for posting the pictures on your dream knife. What a beautiful lady you've made! Seeing her is like climbing the mountain to find what's on top. As I said before, she's the pinnacle of all the Bowies I've ever seen. A gift to behold! Thanks, and best wishes to you my friend. ;)

Jason,
When I took a good look, there was a refined and separate grain flow within the ~1/4" band of wootz.
David
 
ZDP-189 said:
The term or word band was a bad choice, zone would maybe fit better. I would love to take her apart and see what happened and how strong and tough she is. I don't want to destroy her until I have a few like her or better and we have Rex back in the Lab.

I most sincerely thank you for your kind comments and today feel a stronger sense of community building.
Thanks Friends

The log on stuff is Dan's, this message was written by
Ed Fowler, as soon as I can figure how to get back to my own name I will do so.

I was thinking........ who is that masked bandit :confused:
I like that Ed.. wootzever it's called.. :) thanks for showing it...
 
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