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SUMMARY:Hybrid Additive Manufacturing of metal parts with 3D control of in
 ternal stresses and microstructures
DTSTART:20190506T131500
DTEND:20190506T141500
DTSTAMP:20260916T153723Z
UID:ce09fc4f46e746996ea15cb13414e38e0a1c7e6c59fb3788edf2915f
CATEGORIES:Conferences - Seminars
DESCRIPTION:Prof. Roland Logé\, Laboratory of Thermomechanical Metallurgy
 \, EPFL\nA new hybrid additive manufacturing process is introduced\, combi
 ning Laser Shock Peening (LSP) with Selective Laser Melting (SLM)\, and ca
 lled 3D LSP. LSP is a well-known surface treatment introducing plastic def
 ormation and Compressive Residual Stresses (CRS) over a certain penetratio
 n depth into the material. By repeatedly applying LSP during the part fabr
 ication\, 3D LSP can efficiently strain harden a metal and convert SLM ind
 uced Tensile Residual Stresses (TRS) into CRS\, in the bulk of the part. T
 his strategy opens a range of new possibilities such as increased fatigue 
 life or geometrical accuracy\, 3D design of grain structures\, and improve
 d processability. Examples are provided for each of these effects\, lookin
 g at fatigue life and grain structure design of 316L steel samples\, geome
 trical accuracy of Ti-6Al-4V samples\, and processability of a Ni-based su
 peralloy. In the latter case\, 3D LSP brings a new efficient crack healing
  mechanism.   ·        References :   -        N. Kalen
 tics\, E. Boillat\, P. Peyre\, S. Ćirić-Kostić\, N. Bogojević\, R.E. L
 ogé (2017)\, “Tailoring residual stress profile of Selective Laser Melt
 ed parts by Laser Shock Peening”\, Additive Manufacturing 16\, 90-97. -
         N. Kalentics\, E. Boillat\, P. Peyre\, C. Gorny\, C. Kenel
 \, C. Leinenbach\, J. Jhabvala\, R. E. Logé (2017)\, 3D Laser Shock Peeni
 ng – a new method for the 3D control of residual stresses in Selective L
 aser Melting\, Materials & Design 130\, 350–356. -        N. Kal
 entics\, A. Burn\, M. Cloots and R.E. Logé (2018)\, “3D laser shock pee
 ning as a way to improve geometrical accuracy in selective laser melting
 “\, Int. J. Advanced Manufacturing Technology\, https://doi.org/10.1007
 /s00170-018-3033-3. -        N. Kalentics\, K. Huang\, M. Ortega V
 arela de Seijas\, A. Burn\, V. Romano and R.E. Logé (2019)\, “Laser sho
 ck peening: A promising tool for tailoring metallic microstructures in sel
 ective laser melting”\, J. Materials Processing Tech. 266\, 612–618.\n
 \nBio: Roland Logé is an associate professor at EPFL\, with a primary aff
 iliation to the Materials Institute\, and a secondary affiliation to the M
 icroengineering Institute. He is the head of the Laboratory of Thermomecha
 nical Metallurgy\, and active in the field of processing of metals and all
 oys in the solid state\, focusing on the ability to tailor microstructures
 \, and the associated material properties. Thermal and mechanical paths an
 d the resulting microstructures are analyzed and simulated both experiment
 ally and numerically. While most of the activities were so far related to 
 recrystallization\, precipitation\, grain growth\, textures and grain boun
 dary engineering\,  extensions of the microstructure design approach prog
 ressively include phase transformations\, internal stresses and cracking p
 henomena\, with applications to bulk metal forming and additive manufactur
 ing.
LOCATION:MXF 1 https://plan.epfl.ch/?room==MXF%201
STATUS:CONFIRMED
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