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• W2890917900 abstract "Substrates of pure α-Fe were laser alloyed with Ni2B powder, which was injected into the molten bath created by the irradiation of the substrate with a CW-CO2 laser. A 50 % overlap between successive laser passes allowed a larger amount of Ni2B to react with the α-Fe melt. Solidification of the Fe-Ni-B melt produced an off-eutectic microstructure of γ-FeNi and orthorhombic (Fe, Ni)3B in the ∽ 650 μm thick surface-alloyed layer. Its matrix consists of the γ-FeNi phase, which contains about 60 at.% Fe and 40 at.% Ni, the relatively large amount of Ni stabilizing the fcc γ-phase. Between the γ-FeNi dendrites, which are up to ∼80 μm long, a fine lamellar microstructure of γ-FeNi, and (Fe, Ni)3B solidifies. The γ-FeNi and (Fe, Ni)3B lamellae are about 200 nm wide and extend over several μm. Since only a small amount of the injected Ni2B particles are discernible by optical microscopy and X-ray diffraction studies, it is assumed that the nearly complete dissolution of the Ni2B particles in the melt results in the off-eutectic γFeNi and (Fe, Ni)3B microstructure, which in tum causes the improved surface hardness of ∼680 Hvo.1 compared with ∼160 Hvo.1 of the α-Fe substrate.Substrates of pure α-Fe were laser alloyed with Ni2B powder, which was injected into the molten bath created by the irradiation of the substrate with a CW-CO2 laser. A 50 % overlap between successive laser passes allowed a larger amount of Ni2B to react with the α-Fe melt. Solidification of the Fe-Ni-B melt produced an off-eutectic microstructure of γ-FeNi and orthorhombic (Fe, Ni)3B in the ∽ 650 μm thick surface-alloyed layer. Its matrix consists of the γ-FeNi phase, which contains about 60 at.% Fe and 40 at.% Ni, the relatively large amount of Ni stabilizing the fcc γ-phase. Between the γ-FeNi dendrites, which are up to ∼80 μm long, a fine lamellar microstructure of γ-FeNi, and (Fe, Ni)3B solidifies. The γ-FeNi and (Fe, Ni)3B lamellae are about 200 nm wide and extend over several μm. Since only a small amount of the injected Ni2B particles are discernible by optical microscopy and X-ray diffraction studies, it is assumed that the nearly complete dissolution of the Ni2B particles in the melt results in t..." @default.
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• W2890917900 date "1997-01-01" @default.
• W2890917900 modified "2023-09-28" @default.
• W2890917900 title "Microstructure of laser-induced surface-alloyed α-Fe" @default.
• W2890917900 doi "https://doi.org/10.2351/1.5059697" @default.
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