The synchronously periodic re-melting of molten pool was firstly introduced in additive manufacturing to promote the epitaxial growth of columnar structure using a novel quasi-continuous-wave (QCW) laser. The epitaxial growth of columnar structure was intensified and the single-crystal-like sample with highly oriented “zigzag” columnar grains was produced. The modified molten-pool geometry and the synchronously high-frequency re-melting of the molten pool contribute to the formation of single-crystal-like structure. This work reports a new route to promote the continuously epitaxial growth of dendrites for fabrication of single-crystal-like sample.

中文翻译：

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使用准连续波激光增材制造技术直接制造类单晶结构

熔池的同步周期性重熔首先在增材制造中引入，以使用新型准连续波（QCW）激光器促进柱状结构的外延生长。增强了柱状结构的外延生长，并生产了具有高度取向的“之字形”柱状晶粒的单晶状样品。修改后的熔池几何形状和熔池的同步高频重熔有助于形成单晶状结构。这项工作报告了一条新的途径，以促进树枝状晶体的连续外延生长，以制造类单晶样品。