Spatially resolved acoustic spectroscopy for selective laser melting
Spatially resolved acoustic spectroscopy for selective laser melting
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DOI：
10.1016/j.jmatprotec.2016.05.005
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发表时间：
2016-10
影响因子：
6.3
通讯作者：
Richard J. Smith;M. Hirsch;Rikesh Patel;Wenqi Li;A. Clare;S. Sharples
中科院分区：
文献类型：
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作者：
Richard J. Smith;M. Hirsch;Rikesh Patel;Wenqi Li;A. Clare;S. Sharples
增材制造（AM）是一种通常逐层构建部件的制造技术，例如，在选择性激光熔化（SLM）材料的情况下，通过熔合金属粉末层。这允许构造复杂几何形状的部件，在某些情况下，这些部件无法通过传统制造路线制造。复杂零件可能难以检查材料一致性和缺陷，这限制了广泛采用，特别是在高性能领域。空间分辨声光谱（SRAS）是一种基于声表面波速度测量的材料表征技术。在这里，SRAS技术被应用于制备增材制造材料，以测量材料特性并识别缺陷。结果跟踪的选择性激光熔化机的建立功率的测量速度的增加。表面和亚表面缺陷测量（深度为1.24 μm）与电子显微镜和X射线计算机断层扫描进行了比较。已经发现，对于140 W至190 W的熔化功率（平均值：115-119 μm光学和134-137 μm速度），孔尺寸保持相同，但是孔的数量随着较低的熔化功率而显著增加（70-126光学，95-182速度），从而降低总体材料密度。
Additive manufacturing (AM) is a manufacturing technique that typically builds parts layer by layer, for example, in the case of selective laser melted (SLM) material by fusing layers of metal powder. This allows the construction of complex geometry parts, which, in some cases cannot be made by traditional manufacturing routes. Complex parts can be difficult to inspect for material conformity and defects which are limiting widespread adoption especially in high performance arenas. Spatially resolved acoustic spectroscopy (SRAS) is a technique for material characterisation based on robustly measuring the surface acoustic wave velocity. Here the SRAS technique is applied to prepare additively manufactured material to measure the material properties and identify defects. Results are presented tracking the increase in the measured velocity with the build power of the selective laser melting machine. Surface and subsurface defect measurements (to a depth of ∼24 μm) are compared to electron microscopy and X-ray computed tomography. It has been found that pore size remains the same for 140 W to 190 W melting power (mean: 115–119 μm optical and 134–137 μm velocity) but the number of pores increase significantly (70–126 optical, 95–182 velocity) with lower melting power, reducing overall material density.