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首页> 外文会议>THERMEC 2011;International conference on processing manufacturing of advanced materials >Effect of Energy Density of Incident Beam on Mechanical Property of Titanium Alloy Products Fabricated by Electron Beam Melting (EBM) Method
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Effect of Energy Density of Incident Beam on Mechanical Property of Titanium Alloy Products Fabricated by Electron Beam Melting (EBM) Method

机译：入射光束的能量密度对电子束熔化（EBM）法制备的钛合金制品力学性能的影响

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Electron beam melting (EBM) is a promising fabrication technique for directly producing metal products from powder as the starting material. Powders are provided as a thin layer (～100 μm) and melted layer by layer with an electron beam. In this study, the effects of the energy density of the incident beam on the mechanical properties of Ti-6 mass% Al-4 mass% V alloy products fabricated through EBM were examined. The products were fabricated using an electron beam at various energy densities depending on the electron beam current. The microstructures and crystallographic orientations were observed using optical microscopy and electron backscatter diffraction (EBSD), respectively. Compression tests were carried out in 2 loading directions using a mechanical testing machine equipped with strain gauges, one perpendicular (x-y direction) and the other parallel (z direction) to the stacking direction. In principle, the microstructure consisted of an acicular-shaped a phase (hep lattice) and a small-volume β phase (bcc lattice). In addition, columnar grains elongated toward the z direction appeared during the repeated melting and solidification that occurred during the EBM process. An increase in the beam current of the incident beam enlarged the α grains and increased the relative density, resulting in the related Young's modulus of the products. The energy density caused by the beam current also introduces anisotropy in the deformation behavior depending on the loading axis toward the stacking direction. This is closely related to the cast defect arranged along the stacking layers. It was concluded that the mechanical properties of the Ti-6 mass% Al-A mass% V alloy products formed through EBM were very sensitive to the incident beam current and stacking direction, resulting in the exhibition of anisotropic deformation behavior within a limited range of energy density.
机译：电子束熔化（EBM）是一种有前途的制造技术，可以直接从粉末作为起始原料生产金属产品。粉末以薄层（〜100μm）的形式提供，并通过电子束逐层熔化。在这项研究中，研究了入射束的能量密度对通过EBM制造的Ti-6质量％Al-4质量％V合金产品的机械性能的影响。使用取决于电子束电流的各种能量密度的电子束来制造产品。分别使用光学显微镜和电子背散射衍射（EBSD）观察了微观结构和晶体学取向。使用配备有应变仪的机械测试机在两个加载方向上进行压缩测试，一个垂直于（x-y方向），另一个平行于（z方向）堆叠方向。原则上，微观结构由针状a相（hep晶格）和小体积β相（bcc晶格）组成。另外，在EBM过程中发生的反复熔化和凝固过程中，出现了沿z方向伸长的柱状晶粒。入射光束的光束电流的增加会增大α晶粒并增加相对密度，从而导致产品的相关杨氏模量。由束电流引起的能量密度还根据朝向堆叠方向的加载轴在变形行为中引入了各向异性。这与沿堆叠层布置的铸件缺陷密切相关。结论是，通过EBM形成的Ti-6质量％Al-A质量％V合金产品的机械性能对入射光束电流和堆叠方向非常敏感，从而导致在200nm的有限范围内表现出各向异性变形行为。能量密度。

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