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SUMMARY:IMX Seminar Series - High Energy x-ray Microscopy Insights into Ad
 ditive Manufacturing
DTSTART:20211115T131500
DTEND:20211115T141500
DTSTAMP:20260928T193442Z
UID:8daa60fdc58e370f6e6c94322ef3f4e6d9500f7ae3e60b0833364665
CATEGORIES:Conferences - Seminars
DESCRIPTION:Prof. Anthony D. Rollett\, Carnegie Mellon University\, USA\nA
 dditive manufacturing\, aka 3D printing is a relatively new technology tha
 t has given rise to the “maker culture” and an intense interest in des
 ign. That has carried over into metals additive\, which has jumped almost 
 immediately into manufacturing of actual parts in a variety of alloys. In 
 doing so it has liberated thinking about part design albeit within certain
  constraints and complex components have been deployed that were previousl
 y inaccessible\, e.g.\, high temperature heat exchangers. Nothing is ever 
 as simple as it seems\, however\, and the reliability of parts that must c
 arry load depends on the internal (micro-)structure\, especially with resp
 ect to fatigue loading. This motivates detailed study of all aspects of ma
 terials microstructure ranging from defect structures to strain\, all of w
 hich is ideally suited to the use of intense sources of high energy x-rays
  as only third generation light sources can deliver. Computed tomography (
 CT) has revealed the presence of porosity in all additively manufactured m
 etals examined to date and confirmed that appropriate process control can 
 limit it. CT has also provided data on surface condition that we are tryin
 g to link to fatigue performance.  High speed radiography reveals even mo
 re crucial details of how laser light generates vapor cavities that can de
 posit voids past a critical instability point. “Hot” cracking has been
  imaged as it happens during the solidification process\, which offers the
  possibility finding printing recipes for alloys previously considered off
 -limits to 3D printing. High speed\, high resolution diffraction in stainl
 ess steel\, alloy 718 and Ti-6Al-4V reveals unexpected solidification and 
 precipitation sequences. Diffraction microscopy reveals the highly straine
 d nature of printed metals and how microstructure and internal strain stat
 e evolves during subsequent annealing. In all of these activities\, machin
 e learning is an invaluable tool and aid to the researcher.\n\nSupport fro
 m multiple agencies is gratefully acknowledged\, including DOE/BES\, DOE/N
 NSA\, ONR\, NSF\, OEA\, AFOSR\, Northrop-Grumman\, Boeing\, America Makes\
 , Commonwealth of Pennsylvania\, and Ametek.\n 
LOCATION:https://epfl.zoom.us/j/63529996287
STATUS:CONFIRMED
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