Abstract We report the crystallographic texture and passive behavior of nickel-based superalloys prepared by high-deposition-rate laser solid forming (HDR-LSF) additive manufacturing in deaerated 10 wt.% NaNO3. The HDR-LSF Alloy 718, mainly composed of columnar grains, is detected to be weakly fiber textured due to the direction changed structure. However, passive current densities on horizontal and vertical sections have no difference and both increase linearly with the electrode potential. Furthermore, the identical steady-state passive current density on both sections is attributed to the same film/solution interface energy. Amorphous structure of the bi-layer film induces the electrochemical activity isotropy regardless of matrix texture.

中文翻译：

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高沉积速率激光固体成形增材制造镍基高温合金的被动行为

摘要 我们报告了通过高沉积速率激光固体成形 (HDR-LSF) 增材制造在脱气 10 wt.% NaNO3 中制备的镍基高温合金的晶体织构和钝化行为。主要由柱状晶粒组成的 HDR-LSF 合金 718 被检测到由于方向改变的结构而具有弱纤维织构。然而，水平和垂直截面上的无源电流密度没有差异，并且都随电极电位线性增加。此外，两个截面上相同的稳态无源电流密度归因于相同的薄膜/溶液界面能量。无论基体结构如何，双层膜的非晶结构都会引起电化学活性各向同性。