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        Pack-Boriding of Monel 400: Microstructural Characterization and Boriding Kinetics

        Ali Günen,Mourad Keddam,Azmi Erdoğan,Mustafa Serdar Karakaş 대한금속·재료학회 2022 METALS AND MATERIALS International Vol.28 No.8

        Monel 400 was pack-borided in the temperature range of 1173–1273 K for exposure times of 2–6 h. The boride layersproduced on the surface of the alloy were examined by scanning electron microscopy and phase identification was carriedout by X-ray diffraction. The topmost layer on the borided Monel 400 was compact and contained the Ni2Bphase whilethe diffusion zone contained grain boundary precipitates of borides. Boride layers of 35–290 μm thickness and 1002–1476HV0.025hardness were obtained. SEM observations revealed a smooth interface between the boride layer and the diffusionzone. A kinetic model based on the integral method was applied to investigate the kinetics of Ni2Blayer. The boron activationenergy in the Ni2Blayer was estimated as equal to 300.7 kJ mol−1. An experimental validation of the model was madeby comparing the experimental layer thicknesses obtained, after boriding at 1198 K for 1 and 3 h, with predicted values.

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