03-31-2018, 10:26 AM
Outstanding! I never would have guessed there would be an actual formula! Super interesting!
Now I can run some tests to see how this pans out. Actually, you can run even better tests with your kiln.
The difference is that I probably start with really fine grain, due to the rate of reduction from a cylinder with diameter 3" x 10" length, forged all the way down to a blade. By careful low temp forging, I don't know how fine the grain is, but it must be awfully fine before I do any exact grain refinement heat cycles in my kiln.
With low temp forging, and so much rate of reduction, wouldn't it be a given that the grain would be very fine, post forging?
One thing I question is the difference in hardness from coarse to fine grain. Fine grain is more difficult to get fully hardened than coarse grain, in my understanding, and it seems like I've run into that. I switched from Park AAA to Park 50, because I was coming up with a full hard HRC 64 with AAA, and 66 with P50.
If I remember, AAA at 180°F is maybe 9-10 second, where P50 at 100°F is 5-6 seconds. That might be another indicator of successful grain refinement. At least I think so.
Now I can run some tests to see how this pans out. Actually, you can run even better tests with your kiln.
The difference is that I probably start with really fine grain, due to the rate of reduction from a cylinder with diameter 3" x 10" length, forged all the way down to a blade. By careful low temp forging, I don't know how fine the grain is, but it must be awfully fine before I do any exact grain refinement heat cycles in my kiln.
With low temp forging, and so much rate of reduction, wouldn't it be a given that the grain would be very fine, post forging?
One thing I question is the difference in hardness from coarse to fine grain. Fine grain is more difficult to get fully hardened than coarse grain, in my understanding, and it seems like I've run into that. I switched from Park AAA to Park 50, because I was coming up with a full hard HRC 64 with AAA, and 66 with P50.
If I remember, AAA at 180°F is maybe 9-10 second, where P50 at 100°F is 5-6 seconds. That might be another indicator of successful grain refinement. At least I think so.