Talk about a double Hammond

blgoode

blgoode

Joined
Oct 3, 2003
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This was too neat! Steel is 0-1 done with a torch :)
 

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Nice! Never really tried for hamons with O-1! What would that look like if you polished that blade now?

I had one like that I did in 1095 and interrupted the quench, but torch heating is different, so im sure different factors are in play...
 
I heat treated it 2 or 3 times in a row....to me this proves 1 thing.....

That your first hardened steel isnt totally ruined by the second round of hardening......hence the faint transition zone STILL reable through the etch.

I can tell a big difference by cycling the knives through more than 1 heat treat.
 
Can that be true if you bring it back up to critical? Shouldnt it have zero "memory" of hardening at that point, hence the ability to anneal from that point without an etchable hamon after annealing?

Does the structure of the steel inside actually change orientation, and would require normalization to "erase' that memory that the steel has?

Funny how I feel like I know few of the real nitty gritty details about pretty much the most important aspect of the process.....I know "hard steel, hamon" but in reality there is a whole world of things going on, all of which affect the outcome....

Any books on this stuff? I am a sponge!
 
?? Got me...I know annealing comes from controlled cooling I believe :)

There are loads of books but they all make my noggin hurt :)
 
Maybe it is grain refinement. Seems like i read Mete say if you heat to critical and quench it refines the grain, and if you do it a couple times it refines it more. So if Brian is heating then quenching just the edge maybe the edge is getting finer grain than the spine, so it would show up even after a couple cycles like that. What ya think?? :D
 
so how exactly do you heat-treat? Fully harden, then torch the spine?
 
If you call it a hammond one more time, I'm gonna come down there and put a whoopin on ya boy :D

Just kidding B~. That's one heck of a sharp transition line.
 
oopps..I mean Hammon :)

I think I can get that sharp transition line because I am doing the HT process more than once. It takes twice the amount of time to reach temp on the first go around. The 2nd or 3rd time the steel wants to "snap" back to temp real quick so I can try to have better control at that point. Its tricky to do but fun now. Just dont get the the thing too hot.... I still want to get an oven so I can heat treat the "right" way but then again......it sure is fun getting that transition line! ;)

What I find the most fun is doing chopping tests and having the blades hold an edge WELL. My EDC knife is heat treated just as this knife was. After putting a "toothy" edge on it, I have used it weekly to open boxes, shrink wrap, wire ties, and I havent resharpened it once. That has been maybe 3 months ago. The knife will still schread paper and cut my toenails :) Just kidding......maybe :D
 
Good lookin line(s) Brian.

I have quenched blades 4 and 5 time, not liking the hamon and redoing the clay quench, every time the previous hamon was wiped out. I think what you are seeing there is a transition zone created from temp, time and thickness of blade. It may be bainite in-between the two lines. I can get two or three lines by doing an interupted quench, in and out two or three times quickly. Just some thoughts from my experience, I may be wrong here. Multiple quench does refine the grain and bring more aloy into play, it also reduces hardenablity which creats neat effects in hamons.
 
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