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06-23-2008, 09:00 PM #27
- Join Date
- Oct 2006
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- 1,898
Thanked: 995I think eventually if enough abrasive slips in here, we might just get to the pearls.
Just so there isn't any confusion, here is your original statement.
Heating a spine to correct a warp, implies post-heat treatment. And I clearly specified the conditions that required stress relieving a piece. Post heat treatment is neither a normalized or spherodized state. But you did mention stress relief. There is nothing in your original post about heavy machining cold material that would require stress relief. Nothing in the original post mentioned stress relieving the blade before it was heat treated. Straightening a warped blade in this way is not tempering the blade either. So this doesn't qualify as a stress relieving cycle as well. Sadly, it does not serve to "prove your point."
And how did those brainiacs come up with that number? How can you possibly time that? Are they taking photographs of the change and time it that way? I would hate to be the guy with the stop watch trying to get that one right.
Actually it's called a vapor barrier because it causes a barrier. That is why boiler tubes will destroy themeselves from improper cooling if a barrier builds up between the tube wall and the cooling water. The barrier is self sustaining and the only thing the operators can do is correct there actions that caused it. To much heat, to much flow, not enough flow, wrong chemistry, etc...
I think the next time you quench a blade, if you watch carefully, the bubbles grow then pop then regrow and many of them will release from the surface and rise to the top of the quench tank in the convection current caused by the warming of the surrounding water/oil/whatever being warmed by the hot blade, pulling more cooling oil into the proximity of the blade. The fact that the convection current develops shows that the blade is releasing heat into the quenchant, despite the fact that a vapor barrier exists or not. If your theory about vapor barriers being an interference in quenching things was a little more solid, then we'd not be able to harden any kind of steel.
So how does a wooden mallet make it wrong? Oh because you didn't say it.
I'm trying to help you win but you won't see that for a long time I suspect.