Abstract The influence that complex component geometries can have on microstructure formation is investigated in a rocket engine impeller fabricated of a Ti-6Al-4V alloy by selective laser melting (SLM). The SLM melt pool monitoring, indicative of the component's thermal history during processing, is linked to the bulk mapping of martensite decomposition obtained by high energy synchrotron X-ray diffraction. In addition to the martensitic and lamellar microstructures typically obtained during SLM of Ti-6Al-4V, spheroidization is identified to take place in the component's down-skin regions. Grain boundary migration may contribute to the latter effect. Small recrystallized grains form along grain boundaries.

中文翻译：

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绘制 Ti-6Al-4V 的几何形状：从马氏体分解到选择性激光熔化过程中的局部球化

摘要 在由 Ti-6Al-4V 合金制成的火箭发动机叶轮中，通过选择性激光熔化 (SLM) 研究了复杂部件几何形状对微观结构形成的影响。SLM 熔池监测表明部件在加工过程中的热历史，与通过高能同步加速器 X 射线衍射获得的马氏体分解的整体映射相关联。除了通常在 Ti-6Al-4V 的 SLM 过程中获得的马氏体和层状微观结构之外，还确定在部件的下皮区域发生球化。晶界迁移可能有助于后一种效果。沿晶界形成小的再结晶晶粒。