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Solubility of carbon in nanocrystalline α-iron

: Kirchner, A.; Eymann, K.; Quadbeck, P.; Strauß, A.; Kieback, B.


MRS online proceedings library. Online resource 1526 (2013)
ISSN: 1946-4274
Materials Research Society (Fall Meeting) <2012, Boston/Mass.>
Journal Article, Conference Paper
Fraunhofer IFAM, Institutsteil Pulvermetallurgie und Verbundwerkstoffe Dresden ()

By using a thermodynamic model of nanocrystalline alloys the grain size effect on the solubility of carbon in α-iron is calculated. More specifically the enrichment at grain boundaries is predicted to result in a solubility enhancement. An experimental setup is devised to measure carbon solubility in nanocrystalline iron powder in equilibrium with graphite. At 390 °C a solubility of 0.514 at% is determined for nanocrystalline iron with a grain size of 23 nm.