.182" thick samples:
Stress Relief - 1300F for 2 hours, oven cooled overnight
Max ramp speed to 1600F, placed knives in oven at 1200F (so the blade coating properly bakes.), held at 1600 for 30 minutes for preheat.
Max ramp to 2050F, held 20 minutes, quenched in oil, interrupting at 1000F. Oil was175F
Air cool to (near) room temperature, then soaked in LN2 for 60 minutes.
2 hour temper at 300F, quenched in water, then soaked in LN2 for another 60 minutes
2 hour temper at 350F
I did this process with 2 samples, plus 2 others I plate quenched with compressed air to compare. The oil I used was Citgo Quenchol 521, a medium speed oil. In my testing, it took about 14 seconds to get down to 1000F.
To get as accurate as possible with my 1000F timing, I used a few samples to gauge their glow in the dark, and then quenched them until I had the timing down.
I used Condursal Z1100 compound for the oil quenching (Though I steel foil wrapped them for the stress relief.), and of course steel foil wrapped the plate quench samples.
My results with the Condursal were sadly disappointing, and there was a good deal of decarb.
The hardness on the plate quenched samples were 61.5-63RC, testing multiple times on each sample in multiple locations. The oil quenched samples were 61.5-64RC, so pretty much equal. Unfortunately, because the decarb was so bad, I am going to call it a failure. The anit-scale compound is rated at 2013F max temp, so it just didn't hold up.
I am going to do another round of tests to determine how quickly it will quench if in a steel foil pouch (Instead of using anti-scale compound).
Stress Relief - 1300F for 2 hours, oven cooled overnight
Max ramp speed to 1600F, placed knives in oven at 1200F (so the blade coating properly bakes.), held at 1600 for 30 minutes for preheat.
Max ramp to 2050F, held 20 minutes, quenched in oil, interrupting at 1000F. Oil was175F
Air cool to (near) room temperature, then soaked in LN2 for 60 minutes.
2 hour temper at 300F, quenched in water, then soaked in LN2 for another 60 minutes
2 hour temper at 350F
I did this process with 2 samples, plus 2 others I plate quenched with compressed air to compare. The oil I used was Citgo Quenchol 521, a medium speed oil. In my testing, it took about 14 seconds to get down to 1000F.
To get as accurate as possible with my 1000F timing, I used a few samples to gauge their glow in the dark, and then quenched them until I had the timing down.
I used Condursal Z1100 compound for the oil quenching (Though I steel foil wrapped them for the stress relief.), and of course steel foil wrapped the plate quench samples.
My results with the Condursal were sadly disappointing, and there was a good deal of decarb.
The hardness on the plate quenched samples were 61.5-63RC, testing multiple times on each sample in multiple locations. The oil quenched samples were 61.5-64RC, so pretty much equal. Unfortunately, because the decarb was so bad, I am going to call it a failure. The anit-scale compound is rated at 2013F max temp, so it just didn't hold up.
I am going to do another round of tests to determine how quickly it will quench if in a steel foil pouch (Instead of using anti-scale compound).
