>
> Both wustite and fayalite have very very weak magnetic properties, and do
> not respond eg to magnets
>
> hammerscale is (normally) highly magnetic, comprising magnetite, possible
> some small percentage of metallic iron, the oxides fused by a
> 'glasy/fayalitic' phase. Two types of hammerscale, flake breaking from
> the surface of the piece being worked, spheroidal expelled during fire
> welding. Hammerscale can be readily plotted using magnetic
> susceptibility.
> If you need more please contact me
>
> Dr Gerry McDonnell
I have noticed "spheroidal" during the working of the coarser grades
of wrought iron at high temperatures as well as during welding. It seems
to be extruded along the edges normal to the axis of hammer impact.
Thomas Powers
Columbus Ohio
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
|