Hydrogen Embrittlement of 409 Stainless Steel
MrETS
I have a quantity of 409 Stainless steel sheet, .0015" thickness.
I want to employ Hydrogen Embrittlement to be able to crush these sheets
into small particles.
Does anyone in this group have any empirical experience about:
What Pressure, Temperature and Duration the Stainless Steel
should be exposed to the hydrogen to cause severe embrittlement.
It seems natural to assume that the thinner the SS, the more readily
Hydrogen Embrittlement should occur, however I have not performed
any tests yet, and am eager to learn whether someone in this group
has had any first hand experience.
Thanks in Advance for any reply
Rocky, Salt Lake City
MrETS
Rocky, Salt Lake City
tux lover
2. no, thin sheet makes it easier for hydrogen to diffuse out as well
as in.
so, please be more specific about your purpose, and maybe someone can be
more helpful. thanks.
Pittsburgh Pete
> I have a quantity of 409 Stainless steel sheet, .0015" thickness and
> want to employ Hydrogen Embrittlement to be able to crush these sheets
> into small particles.
>
> should be exposed to the hydrogen to cause severe embrittlement.
>
>
------------------------
Rocky:
The problem with what you propose is that in hydrogen embrittlement of
steel the maximum effect will occur at slow strain rates, so you would
have to very slowly crush or crummple the sheets. There are some
papers on hydrogen embrittlement of ferritic stainless - do a search
on www.ingenta.com and you'll find some stuff done at U of Illinois
(Alstetter & students) and Case Western Reserve (Troiano &
students)among others.
Have you considered just lowering the temperature below the
ductile-brittle transition? Maybe just try some liquid nitrogen.
Titanium can be powdered by using hydrogen embrittlement,but that
process is different and involves hydriding and then dehydriding.
Pittsburgh Pete
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MrETS
Liquid Nitrogen works very well, but the sheet is so thin
that it warms up in a few seconds after removing it from the
LN2, hence you don't have enough time to break it up
on the anvil. Also the Anvil and Hammer are relatively warm
to the cold Stainless, and they heat up the thin metal quickly.
Rocky
"Pittsburgh Pete" <meta...@hotmail.com> wrote in message
news:a905fe32.03021...@posting.google.com...
MrETS
The thin 409 stainless sheets are coated with a very thin layer
of refractoy cordierite. I remove the cordierite by balling, then
magnetically separate the tiny pieces of stainless from the
cordierite.
I have found that the tinier the pieces, the easier it is to separate
the cordierite, because the stainless steel then won't 'fold' over
the cordierite, thus 'hiding' it from my extraction process.
Rocky
"tux lover" <u...@ftc.gov> wrote in message
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tux lover
expense?????
i'm more mechanical than chemical, but i'd have thought chemical
separation more effective for material as thin as this.