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首页> 外文期刊>Journal of Manufacturing Processes >Investigating microstructure and defects evolution in laser deposited single-walled Ti6Al4V structures with sharp and non-sharp features
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Investigating microstructure and defects evolution in laser deposited single-walled Ti6Al4V structures with sharp and non-sharp features

机译：用尖锐和非尖锐特征研究激光沉积单壁Ti6Al4V结构中的微观结构和缺陷演化

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摘要

The laser directed energy deposition (laser-DED) Additive Manufacturing (AM) has unique capability of being able to deposit functional geometries on existing components. Many times the required geometries contain sharp features such as abrupt turns. During deposition such features introduces heterogeneity in the build-part and adversely the structural integrity of the part. The slower deposition speeds due to the deceleration and acceleration of the motion controller around sharp features in a geometry leads to defects such as variable wall thickness, porosity, lack of fusion, and cracks. In many cases, the functional geometries are single-walled and there is not enough material volume to machine the deposited material. Such cases pose a unique challenge to the laser-DED techniques capabilities. In this work, single walled cubical Ti6Al4V structure with sharp and rounded corners were fabricated using laser Directed Energy Deposition (DED). Cross sectional and build plane coupons were extracted from each sample for microstructure and defect analysis. Results show that inclusion of small rounded corners (radii of 0.5 and 1.0 mm) leads to consistent deposition speeds. Defect density measurements, using optical microscope, showed reduction of defects from 6.8 +/- 0.35 % to a virtually defect-free structure for samples with the rounded corners. The results also indicated that consistent deposition speed around rounded corners improved homogeneity in the resulting microstructure as compared to the geometry with sharp corners when processed under identical parameters.
机译：激光定向能量沉积（激光 - DED）添加剂制造（AM）具有能够在现有部件上沉积功能性几何形状的独特能力。许多次所需的几何形状包含尖锐的特征，例如突然转弯。在沉积期间，这些特征在构建部分中引入了异质性，并且对部件的结构完整性产生了不利的。由于围绕几何形状的尖锐特征的运动控制器的减速和加速度导致的较慢的沉积速度导致诸如可变壁厚，孔隙率，熔化和裂缝的缺陷。在许多情况下，功能性几何形状是单壁的，并且没有足够的材料体积来加工沉积的材料。这种情况对激光专用技术能力构成了独特的挑战。在这项工作中，使用激光定向能量沉积（DED）制造具有尖锐和圆角的单壁立方体Ti6A1V结构。从每个样品中提取横截面和构建平面优惠券，以进行微观结构和缺陷分析。结果表明，包含小圆角（半径为0.5和1.0mm），导致一致的沉积速度。使用光学显微镜，缺陷密度测量显示，从6.8 +/- 0.35％的缺陷降低，对于具有圆角的样品的几乎缺陷的结构。结果还表明，与在相同参数下处理时的几何形状相比，圆角周围围绕圆角的一致沉积速度提高了所得微观结构的均匀性。

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