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Hysteresis: is the dependence of the output of a system not only on its current input, but also on its history of past inputs. (Credit Wikipedia) FWIW, I got to that understandable definition after several painful excursions through verbal diarrhea. (..or what others might describe as...

We have lots of people that grind post HT and it's normally with something long and thin like a fillet blade where it's easier to keep it flat when just profiled. While minor warping can be straightened, it is a PITA and folder makers have really tight tolerances to work with, so they don't...

Well, the verdict is in - or at least mostly. The grain on magnified observation is very fine. The break goes from choil to one of the spine filework low spots. Apparently, it appears that the fracture began at the choil and progressed to the spine. The file lines were a bit more coarse at...

Hmmmmm..... 5 gallons of beer at $1.00 a can - just about the same price it costs to get 5 gallons of Parks 50 to Canada. Now, "Heat Treating" has always been code for "going out to the shop for a beer".... Quench the thirst and quench the steel. If the blade survived, it would be a selling...

You had me scratching my head on that one John. I'm a huge advocate of hardness testing because it's not uncommon at all to get surprises - whether from misidentified steel, alternate suppliers, environmental fluctuations, prior HT attempts, and so much more. It finally sunk in what you are...

Let us know how that works out for you. :biggrin: ... as an unscientific guess, I suspect you may be overthinking this. There are tens of thousands of knifemakers dunking their blades in LN or Dry Ice solutions. They aren't breaking and they get harder than a woodpecker's lips. Having...

Oh-oh. We Canadians are a little conflicted. If you ask us the temperature outside, we'll tell you its a balmy 21 degrees. If you ask what temperature to heat treat 154CM at, we'll tell you 1950. So much of our HT information comes from US forums and suppliers, we almost exclusively us...

I'll just agree with everyone else, that on high alloy steels it almost always gains a point or two - which of course, we temper back anyhow. I believe that it is probably beneficial and more importantly, generally meets the test of "do no harm". I don't cryo simple tool or carbon steels. I...

I have to say, I been so wonderfully inspired by a great customer service experience recently. I placed an order with Enco. They have a standing set of instructions on file to ship everything USPS because internationally, the postal service just outshines the couriers. This order slipped...

This board needs a "LIKE" button! :thumbup1:

What was your formula for the AEB-L? Asking because it gets REALLY short soak at the high range.

440C will not be very corrosion resistant without HT. If you are thinking of using it for liners, it also won't have much spring without HT. This next part, I don't know the answer to. but I wonder if you would need 440C pins to pin the bolsters, or if any old pin would be a close match? I...

They come from the States to Canada. The suppliers just aren't stocking them. (yet) When a supplier adds a new line of belts, they have to buy a large quantity of each grit and each size to get their dealer discount. In these tough times, committing a large chunk of cash to a new product...

Thanks Ed and Kevin and everyone. Good learning going on here. Looking for ways to improve my process. First, Kevin's website shows 1500F for austenizing 1084, so I thought I'd already dropped temps a bit. What temp do you guys generally use for 1084? Would I still get full hardness out...

I hear you LRB. While I have only broken and observed a few test samples, I have seen deliberate coarse grain and this doesn't look like it in real life. The blade section is actually only about 1" long, so even the thumbnail represents magnification on my laptop screen. The full pic shown is...

Thanks for the response Kevin Most of what you asked for is in my post above (postings crossed I presume). There is no change in quenchant - been using P50 for a couple years now. I held it in the quench for about 30 seconds - hung a wire through the handle hole and hung it in the tank while...

Don't think it got too hot. 1084 - EvenHeat preheated kiln to 1475 and let it stabilize for 15 minutes before putting the blades (2) in. 10 minutes and out. Turco for decarb protection. Grain is nice and fine - not really even visible to the naked eye. After 30 seconds in the P50, I hooked...

Grrrr.... Was still hanging in the quench tank cooling while I got the second blade out of the kiln.

IMHO, carbon steels don't lend themselves well to multiple blades in the kiln. You take one out and try to get the kiln door closed, wasting precious time on the way to quench. Don't know how long you'll have each blade in the quench, but even without figuring that in, the remaining blades...

I was a skeptic too. We cut a fair bit here - not by industrial standards, but probably way more than most knifemakers. On the 4 x 6, 64.5" saw, we've gone from a blade a week to maybe three a year. The 1 1/2 HP 18" saw showed similar results. The problem is that I found little effect to any...