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.