[TheForge] New technique builds super-hard metals from nanoparticles

[Bruce]

No, "closer" would be nearly impossible.  Changes in the volume of steel
grains as they change crystal structure is fairly small, not negligible,
but small.  And martensite (which I believe is the hardest form of steel,
short of cementite = iron carbide) actually occupies slightly *more *space
than ferrite (which I believe is the softest form).  (*Caveat*:  I'm no
metallurgist.)

"More uniform," quite likely.  That may be the point.

Bruce
NJ


On Mon, Jan 25, 2021 at 10:24 PM Rob Fertner <rfertner at cox.net> wrote:

> But aren't the grains packed closer together and more uniform?
>
> -----Original Message-----
> From: theforge-bounces at mailman.qth.net <theforge-bounces at mailman.qth.net>
> On
> Behalf Of Bruce
> Sent: Monday, January 25, 2021 8:19 PM
> To: Blacksmithing List Sponsored by ABANA <theforge at mailman.qth.net>
> Subject: Re: [TheForge] New technique builds super-hard metals from
> nanoparticles
>
> It seemed to me that they were harder not because of density but because of
> control of the individual grains.
> Bruce
> NJ
>
>
> On Mon, Jan 25, 2021 at 4:31 PM Rob Fertner <rfertner at cox.net> wrote:
>
> > I'm assuming they're harder because they are denser. I wonder if this
> > would make them harder to forge?
> >
> > -----Original Message-----
> > From: theforge-bounces at mailman.qth.net
> > <theforge-bounces at mailman.qth.net>
> > On
> > Behalf Of Walter
> > Sent: Monday, January 25, 2021 2:05 PM
> > To: theforge <theforge at mailman.qth.net>
> > Subject: Re: [TheForge] New technique builds super-hard metals from
> > nanoparticles
> >
> > I wonder if these could then become the plastics of tomorrow where
> > they are something we can not reuse or get rid of.
> >
> > On 1/25/2021 2:44 PM, Rob Fertner wrote:
> > > Some interesting metallurgy developments:
> > >
> > > https://phys.org/news/2021-01-technique-super-hard-metals-nanopartic
> > > le
> > > s.html
> > >
> > >
> > >
> > >
> > > Rob
> > >
> > > Wichita, KS
> >
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