2019年8月1日 · LAM techniques can be broadly classified as powder bed fusion (LAM-PBF) and directed energy deposition (LAM-DED) based on material feeding. In LAM-PBF, a thin layer of powder (20–100 μm) is spread on the surface of a substrate or previously deposited layer.

Metal additive manufacturing technologies, such as powder bed fusion process, directed energy deposition (DED) process, sheet lamination process, etc., are one of promising flexible manufacturing technologies due to direct fabrication characteristics of a metallic freeform with a three-dimensional shape from computer aided design data.

通过镍基高温合金IN718的原位和操作同步加速器X射线成像和衍射研究揭示了定向能量沉积增材制造（DED-AM）的控制机理行为。 使用独特的DED-AM工艺复制器，真实空间成像可以量化凝固过程中的熔池边界和流动动力学。 这种成像知识还用于在100μm的空间分辨率下，在转变和应力发展过程中对时间分辨的微观结构相进行精确的衍射测量。 衍射量化的热梯度能够预测树枝状凝固微观结构并将其耦合到应力状态。 快速冷却速度完全抑制了二次相的形成或固态的再结晶。 凝固 …

2019年5月30日 · Direct Energy Deposition - Laser Additive Manufacturing (DED-LAM) is an additive manufacturing (AM) process that uses laser to selectively deposit metal powder, layer-by-layer, to shape three dimensional components, directly from the CAD model [1].

摘要 在这项新颖的研究中，直接能量沉积 - 激光增材制造 (ded-lam) 工艺用于沉积 β 型钛钼 (ti-15mo) 生物医学合金。通过 ded-lam 工艺在基材上成功沉积合金粉末的主要挑战是形成具有最小轨道稀释度的强冶金结合。

2024年11月29日 · Additive manufacturing (AM), specifically Direct Energy Deposition (DED), is efficient in fabricating high-entropy alloys (HEA) owing to its fast-cooling rates, which promote uniform microstructures and reduce defects. This study involved the fabrication of the Ti33Nb28Cr11V11Ni17 (Ti-Nb-Cr-V-Ni) RHEA utilizing DED.

在本文中，我们比较了两种主要的金属3D打印工艺： 激光粉末床熔合 (L-PBF) 和 定向能量沉积 (DED)。 我们将研究每种技术的特性、最常见的应用和领先的制造商，突出它们的异同。 首先简要介绍一下，PBF 包含几种涉及使用粉末床的增材制造工艺，无论是塑料、陶瓷还是金属。 您可能已经猜到了，今天我们将重点关注金属。 这个过程可以使用激光或电子束作为能源，例如 电子束熔化 （EBM），由制造商Arcam于2002年推出。 但是，为了更直接地比较，我们将只关注以 …

2020年5月15日 · In this work, the track dilution generated in single track deposition of Ti-15Mo alloy using the laser additive manufacturing – direct energy deposition (LAM-DED) process is accurately modeled and predicted, using the Matlab …

A major challenge in the successful deposition of an alloy powder on the substrate by the DED-LAM process is the formation of a strong metallurgical bond with minimum track dilution. Targeting a crack-free and dense multi-layer deposition, a detailed investigation of the effect of three key process paramete

2023年8月21日 · This review focuses on the mechanical properties of the LAM, common defects, important processing factors, and its applications, particularly direct energy deposition (DED) and powder bed fusion (PBF), and examines its capacity to create parts with properties that are better than or even on par with those of parts produced using traditional ...