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

Description

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.

Steps to reproduce

The experiments to collect the images in the dataset described in this document is realized via Dynamic X-ray Radiography (DXR) hosted by Advanced Photon Source (APS) at Argonne National Laboratory. DXR technique allows the characterization of the post-solidification hot cracking morphology in the format of 2D static image. Using this technique, we surveyed 10 different alloys: Al7075, Al6061, Al2024, Al5052, Haynes 230, Haynes 160, Haynes X, Haynes 120, Haynes 214, and Haynes 718. Two processing conditions (520W-0.2m/s and 520W-0.3m/s) were evaluated. It’s generally ensured that each test sample at each test condition can have at least 2 measurement to reduce the randomness (Except for Haynes 230, which only had one measurement per test condition). The experiment yielded 49 DXR images in total. Using the software ImageJ, we were able to isolate the hot cracking affected area in each of the DXR image and measure the pixel count for each image. The total pixel count value for each image represents the overall 2D size of the formed hot crack and indicates the hot cracking susceptibility. This method allows the direct measurements of the hot cracking susceptibility for all 10 alloys evaluated here.

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