Quench Problem

Hi, Dave. The program looks fine to me, except for the fact I think I would eliminate the 10 minute hold at the end of segment 3. You can just let it continue but at the slower rate. You'll still have a long enough time climbing to 1475 to get nice even environment at final temp.
Just my opinion, of course. YMMV.
 
Okay, well that worked guys, thanks! When I broke the test pieces, it took some hellish pounding, and finally the steel shattered rather than bending. I tried to get a pic of the grain, which looks really fine, but my cheapo digital microscope has bitten the dust for some reason and I couldn't get one. But to my ancient eyes it looks pretty dang good. I'm happy. Next of course will be edge testing, but I'm confident again.

You folks are really invaluable. :thumbup:
 
What I've read (and believe and use) is not preheating O1. I don't think it is necessary for a knife blade/thin section/high surface to volume ratio piece. I definately keep blades out of the radiant heating path and depend on the slowed rate of temperature gain at small delta-T to accomplish easing up to final temperature. I feel the short amount of time the coils are on when a kiln is at temp and in equilibrium, as well as the internal controller program minimizing swing, should disallow over heating.

I set-temp for austenizing temperature, heat kiln to equilibium, stick the blades in and count 10 to 15 minutes after kiln returns to equilibrium, then quench.

Mike
 
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