[TheForge] Re: You can always tell a Yankee...

[Chuck Robinson]

Dan,
Right the light hammering also refines the grain slightly.
 As long as you don't overdo it.
 Hammering with metal movement of more than 3 to 5 % at red heat is an
invitation the develop micro stress cracks that will eventually ruin the
tool.
Chuck
----- Original Message -----
From: "Dan Tull" <dantull at numail.org>
To: "Sponsored by ABANA" <theforge at mailman.qth.net>
Sent: Friday, January 14, 2005 9:29 AM
Subject: Re: [TheForge] Re: You can always tell a Yankee...


> Chuck,
> If our final heats are "finishing" as they should be ( removing hammer
> marks, flattening,etc.) at a red heat,
> I believe that would be close to critical.
> Again for hot work tools.............
>
>
> dan tull
> georgia
> abba, afc, S.C. psba, obg,sofa
> ----- Original Message -----
> From: "Chuck Robinson" <robi5515 at bellsouth.net>
> To: <mspencer at tallships.ca>; "Sponsored by ABANA"
<theforge at mailman.qth.net>
> Sent: Thursday, January 13, 2005 11:53 PM
> Subject: Re: [TheForge] Re: You can always tell a Yankee...
>
>
> > When you normalize carbon steel you bring it to about 50 degrees F above
> > critical and let it air harden in still air, to black heat.
> > It is a thermal  grain refining process.
> > If you bring the steel to forging temperature much over critical you
will
> > get grain growth and consequently brittle steel. the thickness of the
> > metal
> > will affect how fast the metal cools and consequently how hard the
cooled
> > metal will be.
> > The less carbon and other alloys in the steel the less effect  the
cooling
> > rate will change  the hardness.
> > Chuck
> > ----- Original Message -----
> > From: "Mike Spencer" <mspencer at tallships.ca>
> > To: <theforge at mailman.qth.net>
> > Sent: Thursday, January 13, 2005 5:55 PM
> > Subject: [TheForge] Re: You can always tell a Yankee...
> >
> >
> >>
> >> > For our use, I wonder what the real difference is between
> >> > "normalized" and "as forged"?  As long as the last heats you don't
> >> > beat stresses into it.
> >>
> >> I dunno, Dan.  Sam Allen, the prof at MIT who is also a blacksmith and
> >> has a forge shop in the basement of the main building there, wrote a
> >> first-year textbook for materials science.  I keep meaning to order it
> >> but it keeps getting put off.  I'm not completely clear on the
> >> difference, at the crystal or grain level between annealing and
> >> normalizing.  (Hence the scare quotes around those words in my post.)
> >>
> >> - Mike
> >>
> >> --
> >> Michael Spencer                  Nova Scotia, Canada       .~.
> >>                                                            /V\
> >> mspencer at tallships.ca                                     /( )\
> >> http://home.tallships.ca/mspencer/                        ^^-^^
> >>
> >> --
> >>
> >>
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