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Elastic residual strain and stress measurements and corresponding part deflections of 3D AM builds of IN625 AM-Bench artifacts using neutron diffraction, synchrotron X-ray diffraction, and contour method

Published

Author(s)

Thien Q. Phan, Maria Strantza, Michael R. Hill, Thomas H. Gnaupel-Herold, Jarred C. Heigel, Christopher D'Elia, DeWald Adrian, Bjorn Clausen, Darren C. Pagan, J. Y. Peter Ko, Donald W. Brown, Lyle E. Levine

Abstract

One of the primary barriers for acceptance of additive manufacturing (AM) has been the uncertainty in the performance of AM parts due to residual stresses/strains. The rapid heating and cooling rates, along with the thermal history of the laser melting process, result in residual stresses/strains over a range of length scales. Efforts to mitigate residual stresses using post process heat treatments can significantly impact the microstructures of the AM part which may lead to further issues. Therefore, the ability to accurately predict the residual stresses in as-built AM parts is crucial, and rigorous benchmark measurements are needed to validate such predictions. To fill this need, the AM Bench aims to provide high fidelity residual stress and strain benchmark measurements in well-characterized AM bridge-shape parts. The measurements reported here are part of the residual elastic strain benchmark challenge CHAL- AMB2018-01-RS. These measurements were performed as parts of the larger AMB2018-01 set of measurements that are aimed to investigate the residual stresses within the structure. Residual strains and stresses in this work were measured using neutron diffraction, synchrotron X-ray diffraction, and the contour method. Part deflection measurements were performed using a coordinate measurement machine (CMM) after the part was partially separated from the build plate. These independently measured results show a high degree of agreement between the different techniques.
Citation
Integrating Materials and Manufacturing Innovation
Issue
8

Keywords

additive manufacturing, residual stress, neutron diffraction, X-ray diffraction, contour method

Citation

Phan, T. , Strantza, M. , Hill, M. , Gnaupel-Herold, T. , Heigel, J. , D'Elia, C. , Adrian, D. , Clausen, B. , Pagan, D. , Ko, J. , Brown, D. and Levine, L. (2019), Elastic residual strain and stress measurements and corresponding part deflections of 3D AM builds of IN625 AM-Bench artifacts using neutron diffraction, synchrotron X-ray diffraction, and contour method, Integrating Materials and Manufacturing Innovation (Accessed December 2, 2021)
Created July 28, 2019, Updated October 12, 2021