In situ X-ray imaging of defect and molten pool dynamics in laser additive manufacturing

In situ X-ray imaging of defect and molten pool dynamics in laser additive manufacturing

The laser–matter interaction and solidification phenomena associated with laser additive manufacturing (LAM) remain unclear, slowing its process development and optimisation. Here, through in situ and operando high-speed synchrotron X-ray imaging, we reveal the underlying physical phenomena during the deposition of the first and second layer melt tracks. We show that the laser-induced gas/vapour jet promotes the formation of melt tracks and denu…

Using X-ray lasers, researchers can reconstruct the structure of nanoparticles and biomolecules using so-called single-particle imaging (SPI). However, the technique often requires up to several billion nanoparticles to produce an image, which limits the clarity and sharpness of the image. ...

Effect of laser powder bed fusion parameters on solidification, microstructure evolution and defects in IN718: Experimental investigations and analytical formulations

This study investigates the effect of selective laser melting (SLM) based powder bed fusion (PBF) process parameters on the solidification dynamics and microstructure of IN718 using a Non-Dimensional Heat Input (NDHI) parameter. NDHI accounts for both material properties and process variables,...