Robert Dark
Well-Known Member
Scenario..........
CPM 154 finished to 400 grit
Blade double wrapped in H/T foil
Pre-Heat to 1400 F. to equalize - 10 minute hold
Ramp to 1925 F. - Hold for 30 minutes
Quench (while still in the envelopes) between two 1 inch thick X 6 inch X 12 inch (frozen) aluminum plates with compressed air blown between the plates during quench.
Here is the problem....... When I take the blade out of the envelope(s), the envelope wants to slightly stick to the blade in a few places. Then, the blade is sort of "mottled" looking that requires me to either go back to the grinder or start over by hand at 220 grit, then work through the grits again.
Now, I will admit that the H/T foil is some I have had for several years. When I bought it, I didn't pay attention to the temp rating. Could this be the problem, or is my H/T recipe off? I have also had the same problem with S35VN.
As a side note, I have also tried placing a 1/4" square piece of paper towel in the foil pouch on the tang end in order to help consume any oxygen within the pouch. Doesn't seem to make a difference whether I use it or not. The problem still exists.
What "Foil" are you using and where are you getting it? Any suggestions will be appreciated.
Robert
CPM 154 finished to 400 grit
Blade double wrapped in H/T foil
Pre-Heat to 1400 F. to equalize - 10 minute hold
Ramp to 1925 F. - Hold for 30 minutes
Quench (while still in the envelopes) between two 1 inch thick X 6 inch X 12 inch (frozen) aluminum plates with compressed air blown between the plates during quench.
Here is the problem....... When I take the blade out of the envelope(s), the envelope wants to slightly stick to the blade in a few places. Then, the blade is sort of "mottled" looking that requires me to either go back to the grinder or start over by hand at 220 grit, then work through the grits again.
Now, I will admit that the H/T foil is some I have had for several years. When I bought it, I didn't pay attention to the temp rating. Could this be the problem, or is my H/T recipe off? I have also had the same problem with S35VN.
As a side note, I have also tried placing a 1/4" square piece of paper towel in the foil pouch on the tang end in order to help consume any oxygen within the pouch. Doesn't seem to make a difference whether I use it or not. The problem still exists.
What "Foil" are you using and where are you getting it? Any suggestions will be appreciated.
Robert