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Webinar Recording: Powder evolution and its impact on AM production


September 24, 2018

Did you miss the recent webinar featuring UL and LPW Technology entitled, Powder evaluation and its impact on AM production? Not to worry, we recorded it for you!

Click to access this free webinar recording.


As the manufacturing landscape for powder bed AM shifts from R&D and prototyping to serial production, more focus is being placed on the reuse of powder. However, metal powder is not infinitely reusable, and there have already been a number of investigations which demonstrate that powder will evolve with repeated reuse. In this webinar we discuss the mechanisms which drive powder evolution and present results from some of LPW’s own powder evolution investigations. Finally, we review the range of work conducted on powder evolution by other investigators and summarise how powder evolution differs across  materials and platforms.


  • Duration: 1 hour


  • Mechanisms which drive powder evolution
  • Results from 718 evolution study
  • Introduction of new metric for powder evolution
  • Impact of chemistry variance in virgin powder
  • Factors effective powder evolution
  • Observed defects in powder
  • Review of powder evolution studies



Dr. Neil Harrison | LPW Materials Development Manager

Dr. Neil Harrison uses his knowledge of the behaviors of alloys and materials on Laser Powder Bed Fusion (LPBF) systems to provide technical and consultation services.  His expertise in metal additive manufacturing includes the development and design of alloys and powders optimized for LPBF, and spans both research and practical implementation.

Neil’s PhD at the University of Sheffield was on solidification, microstructure and material response of nickel superalloys processed by LPBF.  He has published works on microstructure and solidification theory in LPBF, and reduction of microcracking in nickel superalloys.

Dr. Khalid Rafi | UL AM Lead Development Engineer

Joining UL in 2015, Dr. Khalid Rafi is responsible for the development of AM materials validation and process validation programs at UL’s Global AM Center of Excellence in Singapore. Leveraging his 14 years of experience in teaching and research, Rafi is also engaged in the development and delivery of UL’s AM training program.

Rafi is recognized as one of the few established metallurgists within the AM industry. His research focuses on process optimization, materials characterization and developing structure-property correlations for metallic parts produced using additive manufacturing techniques including selective laser melting (SLM), electron beam melting (EBM) and ultrasonic consolidation (UC).

Rafi holds a Masters and PhD in Materials and Metallurgical Engineering from the Indian Institute of Technology, Madras, India and has earned a post-doctoral fellowship from the University of Louisville, Kentucky, USA and Nanyang Technological University, Singapore.

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