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Modeling and Characterization of Mechanical Properties in Laser Powder Bed Fusion Additive Manufactured Inconel 718

机译：激光粉末床熔融添加剂制造的Inconel 718的力学性能建模和表征

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摘要

Laser powder bed fusion (L-PBF) is a promising additive manufacturing process capable of manufacturing near net shaped components directly from digital computer-aided-design (CAD) data. Lack of consistency in mechanical properties of L-PBF printed parts prevent widespread adaptation of this technique in industry. To understand the factors that cause variability and inconsistency in mechanical properties two plates each of tensile and compression samples were L-PBF printed in various orientations using Inconel 718 alloy. One plate each of compression and tensile samples was subjected to solution annealing and double aging heat treatment. Tensile, compressive and hardness properties were measured in as built and heat-treated condition. Compressive properties were also characterized in the machined condition to understand the influence of all post-processing activities on mechanical properties. Porosity of compression samples was characterized with X-ray micro computed tomography to understand the influence of porosity on mechanical properties.;Apart from build orientation, factors such as shape, thickness and laser scanning path were found to cause variation in mechanical properties. Anisotropy in mechanical properties that developed because of build orientation and laser scanning path was retained after heat treatment. Hardness increased by 58% after heat treatment. More than 50% of porosity by volume was found to be removed after machining compression samples from 2mm nominal diameter down to 1.5mm diameter. The samples also showed higher yield and Young's modulus after machining. An attempt has been made to explain the observed variability in mechanical properties across orientation and part position on the build plate using machine learning algorithms. Although the regression approach could not explain the variability, the classification technique seems to be a plausible approach. Orientation and position could not completely explain the variability in mechanical properties. This suggests that more variables are involved in determining the final mechanical properties of L-PBF printed parts.
机译：激光粉末床熔合（L-PBF）是一种很有前途的增材制造工艺，能够直接从数字计算机辅助设计（CAD）数据制造接近净成形的组件。 L-PBF印刷零件的机械性能缺乏一致性，阻碍了该技术在工业中的广泛应用。为了理解导致机械性能变化和不一致的因素，使用Inconel 718合金以不同方向在拉伸和压缩样品中分别对两块板进行了L-PBF印刷。分别对压缩和拉伸样品的一块板进行固溶退火和双时效热处理。在制造和热处理条件下测量拉伸，压缩和硬度性能。在加工条件下还对压缩性能进行了表征，以了解所有后处理活动对机械性能的影响。通过X射线计算机断层扫描对压缩样品的孔隙率进行了表征，以了解孔隙率对力学性能的影响;除构造方向外，还发现形状，厚度和激光扫描路径等因素会引起力学性能的变化。热处理后，由于构造方向和激光扫描路径而产生的机械性能各向异性得以保留。热处理后硬度增加了58％。在加工压缩样品（从2mm公称直径到1.5mm直径）后，发现去除了超过50％的体积孔隙。样品在加工后还显示出较高的屈服强度和杨氏模量。已经尝试使用机器学习算法来解释所观察到的跨过构造板上的方向和零件位置的机械性能变化。尽管回归方法无法解释变异性，但分类技术似乎是一种可行的方法。方向和位置不能完全解释机械性能的可变性。这表明在确定L-PBF印刷零件的最终机械性能时涉及更多变量。

著录项

  • 作者

    Moorthy, Senthamilaruvi.;

  • 作者单位

    Colorado School of Mines.;

  • 授予单位 Colorado School of Mines.;
  • 学科 Mechanical engineering.;Mechanics.;Materials science.
  • 学位 M.S.
  • 年度 2018
  • 页码 89 p.
  • 总页数 89
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

  • 入库时间 2022-08-17 11:53:05

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