crook in blade

S

skilldust

Joined
Mar 13, 2007
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278
This was my first heat treat of ss in my new sugar creek. It is a 3/32 x 8" fish knife in cpm-154, I clamped it between 2 pcs of 1/4"x 3/4" brass. When cooled I looked at it and it has a bend in it right at the ricasso.
This is my first dealings with cpm 154, and I wonder if I could re-heat treat it and this time use thicker plates to hold it?
Jerry
 
you can redo the heat treat but its advised to anneal the blade first to return to orginal state. You can use the plate quench to about 400f and then check the blade to see if its straight and do some correction at that time. Seem like your plates are pretty small for plate quench. Look at brians post he shows a plate quench set up that will give you and idea of how much surface you need. You need enough mass to cool the knife from 1900 to 400 in a few seconds and I dont think your plates have that much heat sink ability.

Good luck
 
Usually aluminum plates, 3/4" -1" thick are used.Blade remains in the foil .That should do it. If not you could stress relieve at 1200 F before hardening.
 
Patrick,
Annealing CPM154 is not an easy task. Air hardening steels need a very controlled and special anneal.
On complex alloy stainless steels, sub critical stress relief is much better, and easier.

Jerry, You need larger and more efficient quench plates. Most folks use plates made from aluminum, 2" thick by 3" wide is a good size.
Shop around on ebay and find a piece that you can get and cut in half. Something like a bar that is 34"X3"X1.7" (just an example size) will work well. It is important that both plates used be the exact same size.
Stacy
 
Thanks guys, yesterday- I ordered a pc of alum 9x11x1".
Maybe that will do the trick, If not I'll get a bigger pc.

Now, about that stress relief, how do I do that on air hardening steel-1200 for 20 min then cool slow?[my little brain gets sooo confused]
Thanks again guys for all the help-Jerry
 
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