论文标题
来自CT测量结果的径向孔隙率曲线和激光粉末床融合的融化池信号强度的边缘效应
Edge effects in radial porosity profiles from CT measurements and melt pool signal intensities for laser powder bed fusion
论文作者
论文摘要
有限的过程控制会导致冶金缺陷形成和激光粉末融合制造零件的相对密度不均匀。在这项研究中，通过计算机断层扫描研究了圆柱形15-5 pH不锈钢样品。它显示边缘增强的相对密度曲线。此外，考虑通过记录熔体池的热辐射获得的轴监测信号。在建筑过程的整个持续时间内分析数据会导致统计上增加的熔体池签名，接近与密度曲线相对应的边缘。 ON轴信号中的边缘特定模式通过无监督的时间串联聚类发现。使用有限元方法建模来解释观测值：对于中心和边缘的示例点，它显示了归因于所选激光扫描模式的不同局部热历史。结果激发了具有本地依赖材料参数的组件的未来设计途径。
Limited process control can cause metallurgical defect formation and inhomogeneous relative density in laser powder bed fusion manufactured parts. In this study, cylindrical 15-5 PH stainless steel specimens are investigated by computer tomography; it shows an edge enhanced relative density profile. Additionally, the on axis monitoring signal, obtained from recording the thermal radiation of the melt pool, is considered. Analyzing data for the full duration of the building process results in a statistically increased melt pool signature close to the edge corresponding to the density profile. Edge specific patterns in the on axis signal are found by unsupervised times series clustering. The observations are interpreted using finite element method modeling: For exemplary points at the center and edge it shows different local thermal histories attributed to the chosen laser scan pattern. The results motivate a route towards future design of components with locally dependent material parameters.
