Unveiling the transpassive film failure of 3D printing transition alloys
Unveiling the transpassive film failure of 3D printing transition alloys
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DOI：
10.1016/j.corsci.2022.110412
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发表时间：
2022-06
影响因子：
8.3
通讯作者：
Pengfei Guo;Xin Lin;D. Macdonald;B. Ter-Ovanessian;Jianrui Liu;Guangling Song;Yufeng Zhang;
中科院分区：
文献类型：
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作者：
Pengfei Guo;Xin Lin;D. Macdonald;B. Ter-Ovanessian;Jianrui Liu;Guangling Song;Yufeng Zhang;
研究了过渡金属合金过钝化膜的失效。结果表明：3D打印镍基高温合金过钝化膜在流动NaNO 3溶液中的失效主要是由于金属/阻挡层界面上的阳离子空位凝聚导致的膜层自致开裂和腐蚀诱导的膜层退化。二次钝化引起过钝化膜的形成，其性质已经争论了几十年。这些发现与双层结构一致，该双层结构包括生长到基底合金中的点缺陷阻挡层和沉淀的外层。
The failure of transpassive films on transition metal alloys was investigated. The results show that the failure of the transpassive film on 3D printing nickel-based superalloy in flowing NaNO3solution is dominated by self-induced cracking of the film on niobium-segregated phases and the erosion-induced degradation on the film assisted by cation vacancy condensation at the metal/barrier layer interface. Secondary passivation induces the formation of a transpassive film, the nature of which has been debated for decades. The findings are consistent with a bi-layer structure comprising a point-defective barrier layer that grows into the substrate alloy and a precipitated outer layer.