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- W2801038083 abstract "The aim of the present work was to investigate the precipitation behaviorPrecipitation behavior and mechanism of the sigma (σ) phase in Alloy 925Alloy 925 by employing several complementary techniques of microstructural analysisMicrostructural analysis and thermodynamic calculations. The thermal exposures were performed at 650, 750 and 850 ℃ for different times, after which the thermally exposed specimens were studied and compared in terms of their microstructureMicrostructure and the micro-hardnessHardness of γ matrix. It was found that the chemical compositionComposition of σ phase in Alloy 925Alloy 925 could be represented as (Cr,Mo)6(Ni,Fe)5 with the lattice parameters a = 0.878 nm and c = 0.457 nm. Higher local concentrations of Cr and Mo in the γ matrix caused by the formation of γ′ phase and η phase resulted in the formation of σ phase along the grain boundariesGrain boundaries and in the vicinity of η phase. Higher contents of Cr, Mo, Al, TiTi/Al ratio and Nb in the alloy could accelerate the formation of σ phase. The increase in C content could inhibit the precipitationPrecipitation of σ phase. The formation of σ phase most likely occurred during the thermal exposureThermal exposure at 750 ℃. The amount of σ phase was remarkably increased with the thermal exposureThermal exposure time increasing, which led to the softening of γ matrix." @default.
- W2801038083 created "2018-05-17" @default.
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- W2801038083 date "2018-01-01" @default.
- W2801038083 modified "2023-10-05" @default.
- W2801038083 title "Precipitation Behavior and Mechanism of Sigma Phase in Alloy 925" @default.
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- W2801038083 doi "https://doi.org/10.1007/978-3-319-89480-5_48" @default.
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