Abstract Laser additive manufacturing offers a unique way of tuning microstructure to improve alloy properties with a high degree of freedom by modifying the process parameters such as energy density. This work focuses on the energy density dependence of texture anisotropy and mechanical properties processed by selective laser melting (SLM) of IN 718 superalloy at different laser scanning speeds. It was found that strong columnar grains and 〈001〉 fiber texture become insignificant due to insufficient epitaxial growth as energy density decreases. The discrepancies in Taylor factor distributions induced by texture anisotropy are mainly responsible for the difference in tensile mechanical properties for samples built at different orientations. High Taylor factors lead to the increased strength of diagonally built testing samples. In addition, grain refinement enhances the strengthening effect as energy density decreases.

中文翻译：

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能量密度对选择性激光熔化 Inconel 718 织构和机械各向异性的影响

摘要 激光增材制造提供了一种独特的微结构调整方式，通过修改能量密度等工艺参数，以高自由度改善合金性能。这项工作重点研究了 IN 718 高温合金在不同激光扫描速度下通过选择性激光熔化 (SLM) 处理的织构各向异性和机械性能的能量密度依赖性。研究发现，随着能量密度的降低，由于外延生长不足，强柱状晶粒和〈001〉纤维织构变得不显着。由织构各向异性引起的泰勒因子分布的差异是造成不同取向样品拉伸力学性能差异的主要原因。高泰勒因子导致对角构建的测试样本的强度增加。此外，