Overheated 80crV2

[McDaniel]

I put a couple 80crV2 knives, and a few cpm154 knives in the oven. With the intent to pull the 80crV2 out when it reaches temp.
Unfortunately I stepped away from the oven, and came back to find all the knives soaking at 1950.
Is the 80crV2 ruined??
Once they cooled to around 1400 I let them slowly cool down.

 

[Stacy E. Apelt - Bladesmith]

You will need to cycle them down to get the grain reduced.
Try this -1700°F and air cool to black,
1600° and air cool to black,
1500° and Quench,
1450°Quench,
then a 1250° soak for an hour and air cool.

 

[McDaniel]

Thank you Stacy! Is the 1250° for an hour the only tempering I should need?

 

[McDaniel]

You will need to cycle them down to get the grain reduced.
Try this -1700°F and air cool to black,
1600° and air cool to black,
1500° and Quench,
1450°Quench,
then a 1250° soak for an hour and air

Thank you Stacy! Is the 1250° For an hour the only tempering I should need?

 

[Stacy E. Apelt - Bladesmith]

The 1250° soak is to anneal it. You will have to give it a sanding to remove the surface decarb before a new HT. Do the HT as normal once the blade is refurbished.

 

[Blankblank]

The 1250° soak is to anneal it. You will have to give it a sanding to remove the surface decarb before a new HT. Do the HT as normal once the blade is refurbished.

Using some stainless steel foil, or anti scale with all that cycling seems like a good idea.

 

[Stacy E. Apelt - Bladesmith]

The decarb is already there from the earlier over-temp and time soak, so itis too late to prevent it.

 

[Blankblank]

The decarb is already there from the earlier over-temp and time soak, so itis too late to prevent it.

Yeah. Good point.


On that topic. I put some a2 in my kiln at a very high temp (i was going to try some thermal cycling, for a certain reason thats pretty off topic for this thread though).

And i forgot to put antiscale on it. It needed to sit for 30 minutes if i remember. Half way into the soak i remembered, and decided to just go ahead and let it finish, and deal with whatever comes out.

When i took it out, i had never seen so much scale, or scale quite like what occured. Im guessing because of the chromium it was a very shiny silvery scale, and i lost an insane amount of material, i didnt trust that what was left was even useable anymore so i threw it away.