Eigenstrain Analysis of Residual Stress Relaxation due to Heat Treatment of Additively Manufactured Bodies

In this study, highly accurate experimental data obtained from post printing heat treated LPBF additively manufactured body using the strain tomography technique, that was developed using the measurements in ESRF in 2006, will be used for the determination of creep properties, the eigenstrain reconstruction of full-field residual strains, strain relaxation and creep strain, and the analysis of PPHT parameters. The proposed experiment is the continuation of previous successful experiment that was performed using as-printed LPBF additively manufactured body at the beam-time of Proposal MA5208 awarded by ESRF. Full field eigenstrain reconstruction of residual stresses will be conducted after diffraction data collected from 5 planes and processed using the strain tomography technique. The data collection of this technique is similar to the conventional absorption tomography, but the set-up used for strain tomography quantifies lattice spacing rather than density.