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HRAES characterization of various chromium carbide compounds in steel X20CrMoV121
Skobir, Danijela Anica ...
The X20CrMoV121 steels, intended for high temperataure components in power plants, show during thermal and creep exposure in the range of 550 to 800°C a pronounced change in microstructure. This ...means that during use in this temperature range virtually all carbon is bound to carbide precipitates. The large particles that at first appear on subgrain boundaries are mainly cementite (▫$Fe_3C$▫). When the chromium concentration in cementite rises above the solubility limit, the carbide of type M23C6 is formed with chromium,iron and molybdenium in cation position M. The precipitates of type MX and M2X consist mainly of V, Nb and N. They grow slower than other carbides and are found to precipitate inside subgrains. The change of chemical composition of carbide phases was investigated by high resolution Auger Electron Spectroscopy (HR AES).
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