no!

Hey Vern, the link has a : on the end, so it might mess some folks up.

Can you tell us what you did and the specifics of your materials, quench, etc. Did you through quench this blade?
 
Ok the link will work.i could of missed this one because there were 7 and this was the only one that did this. boo

learning
vern
 
Did you drop it or try to straighten a warp after quenching without tempering?
 
Hey.... I got one just like that from doing the same thing!!!..lol. You'll only make that mistake once.

Never try to straighten a blade that you just quenched. Its brittle as glass. If it warps when you quench it, heat it up and straighten it out, then heat treat it again.
 
Some of the more experienced makers here can help you more than me, but definitely don't want to straighten a just quenched blade that has cooled to near room temp. You have to heat it up to stress relieve and then re-heat treat.

I've been told by people on this board more knowledgeable than myself that if you interrupt the quench near 400 degrees (oil still smoking a bit off the blade), you can actually straighten any warps that occur pretty much just by hand with gloves. At that temp during quench, the martensite transformation is just about to get started and stresses haven't built in the steel to the extent of a room temp blade, and the steel is very soft. You can straighten any warps with a gloved hand, and set the blade aside to cool unaided to room temp.

The reason I say that others may be able to help more, is that I don't know if ALL steels can benefit from a marquench. Check this thread out. There is a ton of good info here:

http://www.bladeforums.com/forums/showthread.php?t=398842&page=2

--nathan
 
With the carbon steels I have used, it seems that you have about five minutes out of the quench in order to straighten with your hands. Mine are usually well below 400o. I can often hold them bare handed to do this, and have never had one break. YET! 01, 1095, file steel, 5160. However, some of the warp, sometimes, returns in the temper.
 
silver_pilate said:
Some of the more experienced makers here can help you more than me, but definitely don't want to straighten a just quenched blade that has cooled to near room temp. You have to heat it up to stress relieve and then re-heat treat.

I've been told by people on this board more knowledgeable than myself that if you interrupt the quench near 400 degrees (oil still smoking a bit off the blade), you can actually straighten any warps that occur pretty much just by hand with gloves. At that temp during quench, the martensite transformation is just about to get started and stresses haven't built in the steel to the extent of a room temp blade, and the steel is very soft. You can straighten any warps with a gloved hand, and set the blade aside to cool unaided to room temp.

The reason I say that others may be able to help more, is that I don't know if ALL steels can benefit from a marquench. Check this thread out. There is a ton of good info here:

http://www.bladeforums.com/forums/showthread.php?t=398842&page=2

--nathan
Click to expand...

Exactly. I didnt believe it so I tried it on a scrap piece of 1084. I quenched it in oil and while it was barely smoking I put it in the vice and put some real pressure on it. It bent at about a 45 degree angle and then starten stiffening up. I tried to bend it back just a couple minutes later and it broke. It takes a couple minutes to fully harden steel after its quenched. Takes nerves of steel to do this on a blade but try it on scrap first to get the feel for it.
 
Early in the knifemaking, I had some warped blades from heat treating by hand using torches. I heated the entire blade but not the handle. Many came out well but some warped.

I placed a warped dagger into the vise and proceded to straighten it out by pulling on the handle with no gloves or eye protection on.

Anyways it was just not straightening, I kept pulling harder until.... Snap! It was almost explosive, as the jagged edges of the now broken in half dagger handle just sliced into my wrist in a very lucky way- only just below the skin and not quite into the veins and arteries.

At the same time shrapnel from the breaking knife flew around the shop.

Lesson learned, don't try straightening out a knife without eye protection and gloves on, and use a wrench or pipe instead of one's hands to pull on the knife. After I got a proper HT paragon oven most of my warpage problems ended.
 
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