Abstract
In order to study the changes of precipitate phases in TMT-strengthened high-chromium ferritic/martensitic steels under high-temperature irradiation conditions, TMT-strengthened P92 steel was irradiated with 3.5 MeV Fe13+ ions at 700 °C up to 0.74 dpa, and precipitate phases in the steel before and after irradiation were observed and analyzed using transmission electron microscopy and energy dispersive spectroscopy. As dominant phases in the steel, Nb-rich MX carbonitride, Cr-rich M23C6 carbide and Cr-rich M2X carbonitride were still present in the steel after the irradiation. Irradiation-induced formation of six new precipitate phases occurred in the steel during the irradiation. Two irradiation-induced Cr-rich precipitates were identified as Cr-rich M3C2 carbides with the same simple orthorhombic crystal structure and completely different lattice parameters. Three irradiation-induced Fe-rich precipitates were determined to be Fe-rich M3C carbide with a simple orthorhombic crystal structure, and two Fe-rich M2C carbides with the same simple orthorhombic crystal structure and completely different lattice parameters. Irradiation-induced Laves phase (Fe2Nb type) with a hexagonal crystal structure was also identified in the irradiated steel. These irradiation-induced phases are discussed.
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