July 28, 2003
Carbon Nanoparticles Make Stronger Longer-Lasting Steel

By using carbon particles which are more than an order of magntude smaller than what is typically used to add to steel of researchers at the National Institute for Materials Science in Tsukuba Japan have produced a much stronger steel

By adding just 0.002% carbon to martensitic steel that already contains 9% chromium, Sawada and colleagues were able to increase the time-to-rupture at 923 Kelvin by a factor of 100 over the strongest creep-resistant steel currently available (which contains about 0.08% carbon).

From the original paper in Nature:

Under constant low-stress loading, and over extended time periods, many materials undergo creep, a permanent deformation that is particularly marked at elevated temperatures. Incorporation of fine particles into metals and alloys, also called dispersion strengthening, is used to impart creep-resistance at high temperatures. A team from Japan's National Institute for Materials Science, Tsukuba, has developed a dispersion strengthening technique that incorporates nanometre-scale carbonitride particles into a martensitic stainless steel (a chromium-containing steel hardened by heat treatment) for improved creep performance.

Share |      Randall Parker, 2003 July 28 12:52 PM  Materials Advances


Comments
Patrick said at July 28, 2003 7:51 PM:

That was carbonitride rather than carbon itself, which would simply disolve at that temperature.

More significantly, that should raise the efficiency of the "old fashioned" coal powered electricity by another 5% or so. Giving another 10% more Megawatthours/dollar, making the bar for any alternative that much higher. Well except those alternatives that ALSO use steam boilers, so Nuclear, burning garbage, solar thermal... they are all raised by an equal amount relative to wind, photovoltaic, gas turbine...

Randall Parker said at July 28, 2003 8:19 PM:

Pat, highly excellent. Check out this post on Arnold Kling's blog where they are arguing about my skeptical attitude toward hydrogen.

Patrick said at July 29, 2003 3:45 PM:

Same old arguments.

One thing that might get hydrogen cars happening would be the development of home electrolysis systems. That way you could use your home electricity to refuel your car. This does not increase efficiency, the efficiency would be terrible.

BUT.... in those countries with 100-300% fuel taxes it offers an end run around the tax man. And people will do all sorts of things to avoid paying tax.

Neil Farbstein said at May 20, 2005 12:35 PM:

Vulvox is seeking investors in high strenth materials and metallurgy projects. Our URL is shown above.

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