[TheForge] Damascus warpage and blade rivets

Mon Feb 23 12:48:00 2004

Duh... mea culpa imbecilicus.

You're referring to a pattern welded material... another cause COULD be
a material bias in your pattern as it is oriented in the blade.  If you
have materials that take on significantly differing levels of stress in
heat treat and the pattern isn't internally symmetrical, I can see that
warping might occur.  I'm not an expert in this, but I would think that
the "cruder" (fewer number of, and therefore larger, layers) the pattern
the greater the possibility of this occurring.  The finer the pattern
is,
the more evenly dispersed the several component materials of the blade
will be.  The larger the layers, the more prone to asymmetry in the
pattern and therefore warping.

In case I'm not being clear, take the trivial case of a two layer
composite of 1018 and D2 wih the materials oriented such that the
D2 is on the right side of the blade and the 1018 on the left.  In
HT the blade is going to warp significantly to the left as the D2
forms some serious martensite and the 1018 just sits there smiling.

If you had four layers, the warpage might be a bit less.  but when
you get to, say, 100 layers, the interspersion of the materials
makes the imbalance very slight and you get far less warping.

Sorry for the brain fart.

Mike McKim wrote:
> 
> I was referring to recovering a previously warped blade.
> 
> > Mike,
> >     Unfortunatley, that would require that I know which way it is going to
> warp
> > before the quench.
> >
> > I think the normalizing idea sounds the most reasonable.  I'll try that
> next
> > time.
> >
> > Danr Katlasmi�r
> > www.irontreeworks.com
> >
> > "Isn't sanity really just a one trick pony, anyway? I mean, all you get is
> one
> > trick, rational thinking! But when you're good and crazy.ooh hoo hoo
> hoo.the
> > sky's the limit!"
> > The Tick
> >
> >
> > Quoting Mike McKim <[email protected]>:
> >
> > > Can it be manually warped in the opposite direction in an equal degree
> while
> > > hot. Upon quenching in water the cooling induced warp would cancel out?
> > >
> > >
> > > > ****This is where it warps*****
> > > > 4. Harden (heat to orange and quench in water)
> > > >    ****This is where it warps*****
> > >
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