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High temperature oxidation of IN 718 manufactured by laser beam melting and electron beam melting: Effect of surface topography

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Academic year: 2021

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Figure

Fig. 1. Roughness and waviness pro fi les, description of parameters.
Fig. 2 shows the optical views of the microstructure of 718 alloys made by the three different processes after being polished and etched by Kalling ’ s reagent
Fig. 4. Roughness and waviness pro fi les along the (XZ) plane parallel to the build direction, and determination of the arithmetical mean height (Ra); and the maximum height (Rz) of the pro fi le: (a) as-built LBM surface, (b) as-built EBM surface, and (c)
Fig. 6. Apparent and parabolic oxidation rate fi tting of the three 718 alloys (LBM, EBM and wrought) at 850 °C for 1000 h: (a) Linear fi tting (Δw/s)² = f(t), (b) Linear fi tting (Δw/
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