Investigation of the effect of Laser Shock Peening in Additively Manufactured samples through Bragg Edge Neutron Imaging
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Investigation of the effect of Laser Shock Peening in Additively Manufactured samples through Bragg Edge Neutron Imaging. / Morgano, M.; Kalentics, N.; Carminati, C.; Capek, J.; Makowska, M.; Woracek, R.; Maimaitiyili, T.; Shinohara, T.; Loge, R.; Strobl, M.
In: Additive Manufacturing, Vol. 34, 101201, 08.2020.Research output: Contribution to journal › Journal article › Research › peer-review
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TY - JOUR
T1 - Investigation of the effect of Laser Shock Peening in Additively Manufactured samples through Bragg Edge Neutron Imaging
AU - Morgano, M.
AU - Kalentics, N.
AU - Carminati, C.
AU - Capek, J.
AU - Makowska, M.
AU - Woracek, R.
AU - Maimaitiyili, T.
AU - Shinohara, T.
AU - Loge, R.
AU - Strobl, M.
PY - 2020/8
Y1 - 2020/8
N2 - Additive manufacturing is a promising and rapidly rising technology in metal processing. However, besides a number of key advantages the constitution of a part through a complex thermo-mechanical process implies also some severe issues with the potential of impacting the quality of products. In laser powder bed fusion (LPBF), the most applied metal additive manufacturing process, the repetitive heating and cooling cycles induce severe strains in the built material, which can have a number of adverse consequences such as deformation, cracking and decreased fatigue life that might lead to severe failure even already during processing. It has been reported recently that the application of laser shock peening (LSP) can counteract efficiently the named issues of LPBF through the introduction of beneficial compressive residual stresses in the surface regions mostly affected by tensile stresses from the manufacturing process. Here we demonstrate how lattice strains implied by LPBF and LSP can efficiently be characterized through diffraction contrast neutron imaging. Despite the spatial resolution need with regards to the significant gradients of the stress distribution and the specific microstructure, which prevent the application of more conventional methods, Bragg edge imaging succeeds to provide essential two-dimensionally spatial resolved strain maps in full field single exposure measurements.
AB - Additive manufacturing is a promising and rapidly rising technology in metal processing. However, besides a number of key advantages the constitution of a part through a complex thermo-mechanical process implies also some severe issues with the potential of impacting the quality of products. In laser powder bed fusion (LPBF), the most applied metal additive manufacturing process, the repetitive heating and cooling cycles induce severe strains in the built material, which can have a number of adverse consequences such as deformation, cracking and decreased fatigue life that might lead to severe failure even already during processing. It has been reported recently that the application of laser shock peening (LSP) can counteract efficiently the named issues of LPBF through the introduction of beneficial compressive residual stresses in the surface regions mostly affected by tensile stresses from the manufacturing process. Here we demonstrate how lattice strains implied by LPBF and LSP can efficiently be characterized through diffraction contrast neutron imaging. Despite the spatial resolution need with regards to the significant gradients of the stress distribution and the specific microstructure, which prevent the application of more conventional methods, Bragg edge imaging succeeds to provide essential two-dimensionally spatial resolved strain maps in full field single exposure measurements.
KW - Laser shock peening
KW - Neutron Imaging
KW - Diffraction Contrast
KW - powder bed fusion
KW - MECHANICAL-PROPERTIES
KW - RESIDUAL-STRESSES
KW - MICROSTRUCTURE
KW - BEHAVIOR
KW - PARTS
U2 - 10.1016/j.addma.2020.101201
DO - 10.1016/j.addma.2020.101201
M3 - Journal article
VL - 34
JO - Additive Manufacturing
JF - Additive Manufacturing
SN - 2214-8604
M1 - 101201
ER -
ID: 247155749