Published March 2, 2023 | Version v1
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Dynamic crystal rocking of nickel-based single crystal superalloy during the epitaxial growth of the additive manufacturing process

  • 1. Institute of High Energy Physics, Chinese Academy of Sciences, 19B Yuquan Road, Beijing, China
  • 2. 3D Printing Research and Engineering Technology Center, Beijing Institute of Aeronautical Materials, Beijing, China
  • 3. The Peac Institute of Multiscale Sciences, Chengdu, Sichuan, China
  • 4. Institute of High Energy Physics, Chinese Academy of Sciences, 19B Yuquan Road, Beijing, China
  • 5. Institute of Fluid Physics, China Academy of Engineering Physics, Mianyang, Sichuan 621900, China

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Description

The understanding of dynamic process of epitaxial microstructure forming in laser additive manufacturing is of vital importance for achieving products with single crystalline texture. Here, we perform in-situ, real-time synchrotron Laue diffraction experiments to capture the microstructural evolution of nickel-based single-crystal superalloys during rapid laser remelting process. In-situ synchrotron radiation Laue diffraction characterizes the crystal rotation behavior and stray grains formation process. With complementary thermo-mechanical coupled finite element simulation and molecular dynamics simulation, we identify that the crystal rotation is governed by the localized heating/cooling heterogeneity induced deformation gradient, and that the subgrains rotation caused by rapid dislocation movement and complex stress field could be the major mechanism in the generation of granular stray grains at the bottom of the melt pool.

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References

Journal reference (Paper where the data is discussed)
Zhang, D., Liu, W., Li, Y. et al. In situ observation of crystal rotation in Ni-based superalloy during additive manufacturing process. Nat Commun 14, 2961 (2023)., doi: 10.1038/s41467-023-38727-8

Preprint (Preprint where the data is discussed)
D. Zhang, W. Liu, Y. Li, D.Sun, Y. Wu, S. Luo, S. Chen, Y. Tao and B. Zhang (submitted), doi: DOI: 10.21203/rs.3.rs-2009907/v1