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SUMMARY:Alloy Design for Laser Additive Manufacturing –  Challenges and 
 Opportunities
DTSTART:20161121T131500
DTEND:20161121T141500
DTSTAMP:20260510T185745Z
UID:3112fd0c24dc83fe95c5217822e2918d38eb99e7fe18e37c71ff7ddf
CATEGORIES:Conferences - Seminars
DESCRIPTION:Dr. Christian Leinenbach\, Empa – Swiss Federal Laboratories
  for Materials Science and Technology Alloy Design for Advanced Processing
  Technologies Group (ADAPT)\nMetal additive manufacturing (AM) techniques 
 are powder-based\, layer by layer methods which can directly build 3D stru
 ctures onto substrates with complex geometries. They offer a unique abilit
 y to dynamically mix materials during the deposition process and produce f
 unctionally graded structures\, new composite microstructures and perhaps 
 even new material classes. An important benefit lies also in the possibili
 ty of repairing components. For the additive manufacture of metals and all
 oys\, selective laser melting (SLM) and laser direct metal deposition (LMD
 ) are usually applied. However\, there have been only a limited number of 
 more or less easily processable alloys used in SLM so far\, and the proces
 sing parameters are usually obtained from a trial-and-error approach. In o
 rder to exploit the advantages of SLM\, novel alloys and composites those 
 are adapted to the special processing conditions during SLM need to be dev
 eloped. This requires a deep understanding of the materials science of met
 al additive manufacturing\, which is currently still lacking. Some of the 
 challenging issues related to the energy beam based process are the very h
 igh heating and cooling rates\, leading to non-equilibrium microstructures
 \, which are usually harder\, less ductile\, and often exhibit high residu
 al stresses\; the strongly textured\, anisotropic microstructures inherite
 d from the solidification conditions\; or the pronounced residual stresses
  resulting from the large thermal gradients in the AM fabricated parts. Ho
 wever\, the very rapid consolidation of the material in a small material v
 olume and the achieved high solidification rates allow for the manufacture
  of components containing meta-stable materials\, as for example metal-dia
 mond composites or new types of oxide dispersion strengthened (ODS) alloys
 \, which are difficult or even impossible to manufacture using conventiona
 l casting or sintering processes. This talk will give an overview of the c
 hallenges and opportunities in metal additive manufacturing from a materia
 ls scientist’s perspective and some relevant results of the AM related r
 esearch at Empa with a particular emphasize on alloy design will be presen
 ted. References:\n\n\n	C. Kenel\, D. Grolimund\, J.F. Fife\, V.A. Samson\,
  S. Van Petegem\, H. Van Swygenhoven\, C. Leinenbach\, Combined in situ sy
 nchrotron microXRD and high-speed imaging on rapidly heated and solidified
  Ti-48Al under additive manufacturing conditions\, Scripta Materialia 114 
 (2016) 117-120\n	C. Kenel\, C. Leinenbach\, Influence of cooling rate on m
 icrostructure formation during rapid solidification of binary TiAl alloys\
 , Journal of Alloys and Compounds 637 (2015) 242-247\n	A.B. Spierings\, C.
  Leinenbach\, C. Kenel. K. Wegener\, Processing of metal-diamond-composite
 s using selective laser melting\, Rapid Prototyping Journal 21(2) (2015) 1
 30-13\n\n\nBio: CL received his M.Sc. in Materials Science and Engineering
  from the University of Saarbrücken (DE) in 2000 and his PhD from the Uni
 versity of Kaiserslautern (DE) in 2004. He has been working at Empa since 
 2005\, currently in the position of a Senior Scientist and Head of the All
 oy Design for Advanced Processing Technologies (ADAPT) Group in Dubendorf 
 and Thun. He was adjunct lecturer for materials science and engineering at
  the University of Kaiserslautern (2005-2014) and currently teaches at ETH
  Zurich. CL’s R&D work has been focusing on the simulation-assisted deve
 lopment/optimization and microstructure design of structural alloys and me
 tal-matrix composites\, mainly for beam-based additive manufacturing and j
 oining processes\, as well as on the experimental characterization of the 
 influence of advanced processing technologies on the microstructure and (t
 hermo-)mechanical properties of complex structural materials. His work has
  received several distinctions at international conferences (e.g. CALPHAD 
 Award 2012 and 2015\, Best Paper Award of the Alloy Phase Diagram Internat
 ional Commission (APDIC) 2013\, Best Paper Award at the Solid Free Form Fa
 brication Symposium (SFF) 2014). Other awards include the Mechanical Engin
 eering Faculty Award 2005 of the University of Kaiserslautern for the exce
 llence of his Ph.D. dissertation and the Empa Innovation Award 2014. He is
  member of the directory board of the Swiss Association for Materials Scie
 nce and Technology and member of the Expert Group “Additive Manufacturin
 g” of the Swiss Academy for Technical Sciences\n
LOCATION:MXF 1 https://plan.epfl.ch/?room==MXF%201
STATUS:CONFIRMED
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