Microscale Observation via High-Speed X-ray Diffraction of Alloy 718 During In Situ Laser Melting

Oh, Seunghee A.; Lim, Rachel E.; Aroh, Joseph W.; Chuang, Andrew C.; Gould, Benjamin J.; Bernier, Joel V.; Parab, Niranjan; Sun, Tao; Suter, Robert M.; Rollett, Anthony D.

doi:10.1007/s11837-020-04481-1

Microscale Observation via High-Speed X-ray Diffraction of Alloy 718 During In Situ Laser Melting

Journal Article · Mon Nov 16 23:00:00 EST 2020 · JOM. Journal of the Minerals, Metals & Materials Society

DOI:https://doi.org/10.1007/s11837-020-04481-1· OSTI ID:1762836

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Carnegie Mellon Univ., Pittsburgh, PA (United States); Carnegie Mellon University, Pittsburgh, PA
Carnegie Mellon Univ., Pittsburgh, PA (United States)
Argonne National Lab. (ANL), Lemont, IL (United States)
Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
Univ. of Virginia, Charlottesville, VA (United States)

The laser melting process is accompanied by rapid evolution in temperature, phase, structure, and strain because of its high heating and cooling rates. In this study, the evolution of grains within a thin solid plate of Ni alloy 718 during laser processing was probed with in situ high-energy x-ray diffraction experiments. The high temporal and spatial resolution available in the measurement allowed us to study the rapid evolution of the melted region beneath the surface of the sample. The characterization of the evolution of secondary phases, i.e., Laves and carbide, was captured despite the weak diffracted peaks caused by small volume fractions. Thermal history was estimated based on changes in the lattice spacing from the thermal contraction upon cooling. In conclusion, the temporal variation in 2θ with azimuthal direction revealed the evolution in anisotropy of lattice spacing and thus of the mechanical state during laser processing.

View Accepted Manuscript (DOE)

Research Organization:: Carnegie Mellon Univ., Pittsburgh, PA (United States)

Sponsoring Organization:: USDOE National Nuclear Security Administration (NNSA)

Contributing Organization:: Advanced Photon Source (APS), Argonne National Laboratory

Grant/Contract Number:: NA0003915; AC02-06CH11357

OSTI ID:: 1762836

Alternate ID(s):: OSTI ID: 1775456

Journal Information:: JOM. Journal of the Minerals, Metals & Materials Society, Journal Name: JOM. Journal of the Minerals, Metals & Materials Society Journal Issue: 1 Vol. 73; ISSN 1047-4838

Publisher:: SpringerCopyright Statement

Country of Publication:: United States

Language:: English

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Microscale Observation via High-Speed X-ray Diffraction of Alloy 718 During In Situ Laser Melting

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