Hot Cracking Susceptibility (DXR) for Al alloys and Ni alloys Measured by Dynamic X-ray Radiography

Multi-kHz DXR is a characterization technique underpinned by large X-ray flux afforded by synchrotron radiation sources. The strong penetration of high energy x-ray allows in depth imaging of the sample. We used this technique to characterize the post-solidification hot cracking formation in Laser Powder Bed Fusion (L-PBF) process. The established dataset contains a series of DXR images capturing the post-solidification hot cracking distribution for 10 kinds of alloys processed by two different laser processing conditions (520W-0.3m/s and 520W-0.4m/s). Analyzing to the DXR images allows a quantification to the hot cracking susceptibility of the surveyed 10 alloys. In the end, a hot cracking susceptibility ranking of these alloys was obtained based on this analysis.

多kHz DXR（Multi-kHz DXR）是一种依托同步辐射光源提供的强X射线通量的表征技术。高能X射线具备极强的穿透能力，可实现样品的深层成像。本研究采用该技术对激光粉末床熔融（Laser Powder Bed Fusion, L-PBF）工艺中凝固后热裂纹的形成过程进行表征。本数据集包含一系列DXR图像，用于记录在两种不同激光加工参数（520W-0.3m/s与520W-0.4m/s）下制备的10种合金的凝固后热裂纹分布情况。通过对上述DXR图像开展分析，可实现对所调研的10种合金热裂纹敏感性的量化表征。最终，基于该分析得到了这批合金的热裂纹敏感性排序结果。