Mukherjee Saptarshi, Benavidez Edward, Crumb Michael, Calta Nicholas P
Lawrence Livermore National Laboratory, Livermore, CA 94550, USA.
Sensors (Basel). 2024 Jan 15;24(2):523. doi: 10.3390/s24020523.
With the growing interest in metal additive manufacturing using laser powder bed fusion (LPBF), there is a need for advanced in-situ nondestructive evaluation (NDE) methods that can dynamically monitor manufacturing process-related variations, that can be used as a feedback mechanism to further improve the manufacturing process, leading to parts with improved microstructural properties and mechanical properties. Current NDE techniques either lack sensitivity beyond build layer, are costly or time-consuming, or are not compatible for in-situ integration. In this research, we develop an electrical resistance diagnostic for in-situ monitoring of powder fused regions during laser powder bed fusion printing. The technique relies on injecting current into the build plate and detecting voltage differences from conductive variations during printing using a simple, cheap four-point electrode array directly connected to the build plate. A computational model will be utilized to determine sensitivities of the approach, and preliminary experiments will be performed during the printing process to test the overall approach.
随着人们对使用激光粉末床熔融（LPBF）进行金属增材制造的兴趣日益浓厚，需要先进的原位无损评估（NDE）方法，这些方法能够动态监测与制造过程相关的变化，可用作反馈机制以进一步改进制造过程，从而生产出具有改善的微观结构性能和机械性能的零件。当前的无损检测技术要么缺乏超出构建层的灵敏度，成本高昂或耗时，要么不适合原位集成。在本研究中，我们开发了一种电阻诊断方法，用于在激光粉末床熔融打印过程中原位监测粉末熔合区域。该技术依靠将电流注入构建板，并使用直接连接到构建板的简单、廉价的四点电极阵列检测打印过程中由于导电变化而产生的电压差。将利用计算模型来确定该方法的灵敏度，并在打印过程中进行初步实验以测试整体方法。
