Discussion:
Case harden 316l?
(too old to reply)
Peter Fairbrother
2020-03-04 23:08:15 UTC
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Possible? Easy?

thx
Richard Smith
2020-03-09 20:09:42 UTC
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Post by Peter Fairbrother
Possible? Easy?
thx
Wouldn't it form carbides everywhere, especially on the grain
boundaries, particularly with Chromium, serving zero useful purpose
and thereby "robbing" the metal matrix of the solute metals which make
it stainless?
ie. you'd get a brittle material which corrodes badly?

There's extremely high-carbon stainlesses made by powder metallurgy,
giving a pocket knife costing about US$100 and where you can both do
any normal task and shave with it.
Peter Fairbrother
2020-03-11 07:20:43 UTC
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Post by Richard Smith
Post by Peter Fairbrother
Possible? Easy?
thx
Wouldn't it form carbides everywhere, especially on the grain
boundaries, particularly with Chromium, serving zero useful purpose
and thereby "robbing" the metal matrix of the solute metals which make
it stainless?
ie. you'd get a brittle material which corrodes badly?
There's extremely high-carbon stainlesses made by powder metallurgy,
giving a pocket knife costing about US$100 and where you can both do
any normal task and shave with it.
I don't know whether a carbon-rich layer would work, but if not maybe
nitrogen or something?

I am looking for an easy(-ish) home workshop process if possible.

Peter F
RustyHinge
2020-10-22 10:01:44 UTC
Permalink
Post by Peter Fairbrother
Post by Richard Smith
Post by Peter Fairbrother
Possible? Easy?
thx
Wouldn't it form carbides everywhere, especially on the grain
boundaries, particularly with Chromium, serving zero useful purpose
and thereby "robbing" the metal matrix of the solute metals which make
it stainless?
ie. you'd get a brittle material which corrodes badly?
There's extremely high-carbon stainlesses made by powder metallurgy,
giving a pocket knife costing about US$100 and where you can both do
any normal task and shave with it.
I don't know whether a carbon-rich layer would work, but if not maybe
nitrogen or something?
I am looking for an easy(-ish) home workshop process if possible.
coat with stellite and regrind?
--
Rusty Hinge
To err is human. To really foul things up requires a computer and the BOFH.
Richard Smith
2020-10-25 21:17:53 UTC
Permalink
Post by RustyHinge
Post by Peter Fairbrother
Post by Richard Smith
Post by Peter Fairbrother
Possible? Easy?
thx
Wouldn't it form carbides everywhere, especially on the grain
boundaries, particularly with Chromium, serving zero useful purpose
and thereby "robbing" the metal matrix of the solute metals which make
it stainless?
ie. you'd get a brittle material which corrodes badly?
There's extremely high-carbon stainlesses made by powder metallurgy,
giving a pocket knife costing about US$100 and where you can both do
any normal task and shave with it.
I don't know whether a carbon-rich layer would work, but if not
maybe nitrogen or something?
I am looking for an easy(-ish) home workshop process if possible.
coat with stellite and regrind?
--
Rusty Hinge
To err is human. To really foul things up requires a computer and the BOFH.
Useful properties are obtained by giving a high-carbon layer to
stainless steels. This was being looked at 20 years ago as I met it.
They were aiming for around 6.5%C. Can't remember the method used.
Cannot be "case-hardening" with time at temperature in a carbon-source
material, as the carbon would react with the alloying elements and give
carbides (?)

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