Journal
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
Volume 399, Issue 1-2, Pages 72-83Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.msea.2005.02.019
Keywords
neutron diffraction; contour methods; residual stresses; laser engineered net hapin; (LENS (R))
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During manufacturing of components by laser engineered net shaping (LENS). a solid freeform fabrication process. the introduction of residual stresses causes deformation or in the worst case. cracking. The origin is attributed to thermal transients encountered during solidification. In the absence of reliable predictive models for the residual stresses. measurements are necessary. Residual stresses were measured in LENS4 (R) samples of 316 stainless steel and Inconel 718 having simple geometrical shapes by both neutron diffraction and the contour methods. The results by the two Methods are compared and discussed in the context of the growth direction during the LENS process. Surprisingly, the residual stresses are practically uni-axial. with high stresses in the growth direction, (c) 2005 Elsevier B.V. All rights reserved.
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