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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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Fig. 1. Roughness and waviness profiles, description of parameters.Table 1
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. 3. Focus variation and interferometric microscope views of surface topography on the (XZ) plane: (a) as-built LBM surface, (b) as-built EBM surface, and (c) wrought P600-ground (similar to EBM and LBM samples 100% P600-ground).
Fig. 5. Isothermal oxidation kinetics of the three 718 alloys (LBM, EBM and wrought) at 850 °C for 48 h, 100 h and 1000 h (the 48 h and 100 h experiments were conducted in TGA under synthetic air flow, others in static lab air).
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