Re: stress

[don hall <drhall@iglou.com>]

Garage Metallurgy: Lifetime is not enough to become perfect at this stuff ----
Heat needs to be at dark yellow to avoid crystalline rearrangement into an
annealed, or soft, condition.
Stick metal into Room Temp water, soon after loosing glow.
Here are some basic colors and hardness factors:
Faint Yellow
Deep Straw - stop here for chisels, etc.
Bronze turns to Brown spotted with purple -- correct color for axes
Then to Blue.
A long slow parade of colors shows the best results on HighCarbon Steel.

DonHall




"VanDerWal, Peter" wrote:

> >Maybe less than "scientific"... weld a bit and grab a hammer and beat the
> >stress out of it!!  (I realise this is a "rough" method...but it sure
> >reduces warpage!)
> >
> -snip-
> >> If you are going for the absolute top strength, you must heat treat the
> >> entire completed structure in a tempering oven. This relieves all the
> >> thermally-induced stress in the heat-effected zones, but also converts
> all
> >> the martensite back to austenite to restore the full toughness of 4130.
>
> Hammering 'might' relieve the stress, but it won't return the temper lost
> during welding.  Heat-treating it is the only method I know of that will do
> that, though I'd love to hear about a simpler method that could be done in
> the garage.

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