| Abstract Scope |
The recent, rapid development of ultra-high speed imaging, with diffraction, of the melting, vaporization, resolidification and transformation of metals under laser melting is reprised. Phenomena as diverse as keyhole instability, schlieren imaging of plumes, defect formation, beam steering, phase competition during solidification, hot cracking, residual strain development and solid state transformation are briefly reviewed. The impact on metals additive technology will be discussed. The ways in which such data support computational modeling is reviewed. |