Non-isothermal Crystallization and Thermal Transformation Behaviors of Plasma Sprayed Fe₄₈Cr₁₅Mo₁₄Cl₅B₆Y₂ Amorphous Coating

Abstract

The non-isothermal crystallization dynamic behavior and mechanism of plasma sprayed Fe₄₈Cr₁₅Mo₁₄C₁₅B₆Y₂ coating were thoroughly studied. The phase transition and crystallization kinetics of the coating were elaborately investigated by differential scanning calorimetry (DSC), X-ray diffraction (XRD), scanning electron microscopy (SEM), and transmission electron microscopy (TEM). The findings reveal that the characteristic temperatures of the coating shift to an elevated temperature at a higher heating rate and the crystallization processes are thermally activated. The 3-rd step of crystallization processes is more susceptible to the continuously increased heating rate while the onset crystallization reaction is less sensitive to the continuously enhanced heating rate. Fe₂₃(C, B)₆ phase is inclined to precipitate than other crystal phases due to the substantial pre-generation of α-Fe. The onset nucleation and growth of α-Fe crystals is tough due to a higher onset apparent activation energy. Meanwhile, the transformation from Fe₂₃(C, B)₆ to FeB is harder in comparison with the precipitation of other crystals. The most parts of the three crystallization processes are dominated by three-dimensional diffusion model due to the fact that most values of local Avrami exponent are higher than 2.5.

Keywords

plasma spraying / non-isothermal crystallization / phase transition / diffusion mode

References

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