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Study of Residual Stresses in Additively Manufactured Ti-6Al-4V by Neutron Diffraction Measurements
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Study of Residual Stresses in Additively Manufactured Ti-6Al-4V by Neutron Diffraction Measurements
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Journal Article
Study of Residual Stresses in Additively Manufactured Ti-6Al-4V by Neutron Diffraction Measurements
2020
Overview
Neutron diffraction is a powerful non-destructive volumetric evaluation method for the analysis of the internal stress state in components processed by laser powder bed fusion (LPBF). High cooling rates and heterogeneous distribution of temperature during additive manufacturing lead to large residual stress fields. Residual stresses developed during the building process have unquestionably an important influence on the mechanical performance and potentially lead to delamination from the support structures, shape distortion but also crack formation. In the present work, neutron measurements have been carried out on cube-shaped samples prepared by LPBF from a Ti-6Al-4V powder bed. A series of miscellaneous positions (center, edge, and corner) over three different depths (close substrate, middle, and close surface) have been analyzed by neutron diffraction so as to systematically characterize the full stress tensor. The influence of shear stresses and second-order residual stresses on the stress tensor analysis is also discussed in this work.
