The oxidation behaviour of IN 718 alloys produced by laser beam melting and electron beam melting was compared to that of the wrought alloy at 850 °C in laboratory air. Oxide scales of all alloys were similar in nature and morphology with small differences due to powder particles sintered on the surface of additive manufacturing parts. Nevertheless, major differences in surface topography were noticed, these could affect surface area estimations and consequentlymass gain estimations. A quantitative correlation was determined between apparent parabolic rate constant and surface area.

中文翻译：

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激光束熔化和电子束熔化制造的 IN 718 的高温氧化：表面形貌的影响

通过激光束熔化和电子束熔化生产的 IN 718 合金的氧化行为与 850 °C 在实验室空气中的锻造合金的氧化行为进行了比较。由于粉末颗粒烧结在增材制造零件的表面，所有合金的氧化皮在性质和形态上都相似，只有很小的差异。然而，注意到了表面形貌的主要差异，这些差异可能会影响表面积估计并因此影响质量增益估计。在表观抛物线速率常数和表面积之间确定了定量相关性。