X-ray characterization of the micromechanical response ahead of a propagating small fatigue crack in a Ni-based superalloy

Naragani, Diwakar P.; Shade, Paul A.; Kenesei, Peter; Sharma, Hemant; Sangid, Michael D.

doi:10.1016/j.actamat.2019.08.005

Title: X-ray characterization of the micromechanical response ahead of a propagating small fatigue crack in a Ni-based superalloy

Journal Article · Thu Aug 08 00:00:00 EDT 2019 · Acta Materialia

DOI:https://doi.org/10.1016/j.actamat.2019.08.005· OSTI ID:1563914

Naragani, Diwakar P. ^[1]; Shade, Paul A. ^[2]; Kenesei, Peter ^[3]; Sharma, Hemant ^[3];

^[1]

Purdue Univ., West Lafayette, IN (United States). School of Aeronautics and Astronautics
Air Force Research Lab. (AFRL), Wright-Patterson AFB, OH (United States). Materials and Manufacturing Directorate
Argonne National Lab. (ANL), Argonne, IL (United States). Advanced Photon Source (APS)

The small fatigue crack (SFC) growth regime in polycrystalline alloys is complex due to the heterogeneity in the local micromechanical fields, which result in high variability in crack propagation directions and growth rates. Here in this study, we employ a suite of techniques, based on high-energy synchrotron-based X-ray experiments that allow us to track a nucleated crack, propagating through the bulk of a Ni-based superalloy specimen during cyclic loading. Absorption contrast tomography is used to resolve the intricate 3D crack morphology and spatial position of the crack front. Initial near-field high-energy X-ray diffraction microscopy (HEDM) is used for high-resolution characterization of the grain structure, elucidating grain orientations, shapes, and boundaries. Cyclic loading is periodically interrupted to conduct far-field HEDM to determine the centroid position, average orientation, and average lattice strain tensor for each grain within the volume of interest. Reciprocal space analysis is used to further examine the deformation state of grains that plasticize in the vicinity of the crack. Analysis of the local micromechanical state in the grains ahead of the crack front is used to rationalize the advancing small crack path and growth rate. Specifically, the most active slip system in a grain, determined by the maximum resolved shear stress, aligns with the crack growth direction; and the degree of microplasticity ahead of the crack tip helps to identify directions for potential occurrences of crack arrest or propagation. The findings suggest that both the slip system level stresses and microplasticity events within grains are necessary to get a complete description of the SFC progression. Further, this detailed dataset, produced by a suite of X-ray characterization techniques, can provide the necessary validation, at the appropriate length-scale, for SFC models.

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Research Organization:: Argonne National Laboratory (ANL), Argonne, IL (United States)

Sponsoring Organization:: USDOE Office of Science (SC), Basic Energy Sciences (BES)

Grant/Contract Number:: AC02-06CH11357

OSTI ID:: 1563914

Alternate ID(s):: OSTI ID: 1562979

Journal Information:: Acta Materialia, Vol. 179, Issue C; ISSN 1359-6454

Publisher:: ElsevierCopyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 25 works

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36 MATERIALS SCIENCE
Fatigue crack growth
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