Journal Article

PUBDB-2026-01872

http://join2-wiki.gsi.de/foswiki/pub/Main/Artwork/join2_logo100x88.png Strain Mapping in the Vicinity of Cracks Using a Conical Slit Setup for Angular Dispersive Synchrotron X-Ray Diffraction

Loebich, F.Extern* ; Möller, N. ; Richter, J. ; Wegener, T.Extern* ; Canelo-Yubero, D. ; Maawad, E.HZG*Hereon* ; Schell, N.HZG*Hereon* ; Gibmeier, J.Extern* ; Niendorf, T.Extern*

2026
Springer Boston, Mass.

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Please use a persistent id in citations: doi:10.1007/s11340-026-01336-9

Abstract: Background Laser-based powder bed fusion (PBF-LB/M) is a manufacturing technique that enables tailoring of the propertiesof components towards the application, provided the process parameters are adjusted. However, the process inducesresidual strain and stresses, influencing, i.e., the fatigue properties. To analyze the residual strain distributions in the vicinityof fatigue cracks in the bulk of specimens a high lateral resolution is necessary, which limits the possible analysis methodsto high-energy synchrotron X-ray diffraction.Objective The objective is to propose a viable strategy to determine the (lattice) strain distributions in the vicinity of fatiguecracks in AISI 316L compact-tension specimens manufactured via PBF-LB/M.Methods An angular dispersive high-energy synchrotron X-ray diffraction setup with conical slits is used, to restrict thegauge volume to the center of the specimens. Complementarily, the residual stress distribution near the surface is investigatedusing the incremental hole-drilling method.Results Along the build direction a compressive residual strain distribution of higher magnitude is found, which is significantlyreduced in the vicinity of the crack. Depending on whether the crack opening direction is aligned with the transverseor the build direction, a tensile lattice strain field or a lattice strain field of reduced magnitude is found ahead of the crack tip.Conclusions The results indicate that the proposed strategy is well suited to determine the (lattice) strain distributions in thevicinity of fatigue cracks in the center of the specimens with a sufficient lateral resolution.

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Contributing Institute(s):

1. DOOR-User (DOOR ; HAS-User)
2. Helmholtz-Zentrum Hereon (Hereon)

Research Program(s):

1. 6G3 - PETRA III (DESY) (POF4-6G3) (POF4-6G3)

Experiment(s):

1. PETRA Beamline P07 (PETRA III)

Appears in the scientific report 2026

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Database coverage:
; Clarivate Analytics Master Journal List ; Current Contents - Engineering, Computing and Technology ; DEAL Springer ; DEAL Springer ; Ebsco Academic Search ; Essential Science Indicators ; IF < 5 ; JCR ; Nationallizenz ; SCOPUS ; Science Citation Index Expanded ; Web of Science Core Collection

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