In situ observation of crystal rotation in Ni-based superalloy during additive manufacturing process

Dongsheng Zhang, Wei Liu, Yuxiao Li, Darui Sun, Yu Wu, Shengnian Luo, Sen Chen (), Ye Tao () and Bingbing Zhang ()
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Dongsheng Zhang: Chinese Academy of Sciences
Wei Liu: AECC Beijing Institute of Aeronautical Materials
Yuxiao Li: The Peac Institute of Multiscale Sciences
Darui Sun: Chinese Academy of Sciences
Yu Wu: AECC Beijing Institute of Aeronautical Materials
Shengnian Luo: The Peac Institute of Multiscale Sciences
Sen Chen: China Academy of Engineering Physics
Ye Tao: Chinese Academy of Sciences
Bingbing Zhang: Chinese Academy of Sciences

Nature Communications, 2023, vol. 14, issue 1, 1-11

Abstract: Abstract Understanding the dynamic process of epitaxial microstructure forming in laser additive manufacturing is very important for achieving products with a 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 the rapid laser remelting process. In situ synchrotron radiation Laue diffraction characterises the crystal rotation behaviour and stray grain formation process. With a complementary thermomechanical coupled finite element simulation and molecular dynamics simulation, we identify that the crystal rotation is governed by the localised heating/cooling heterogeneity-induced deformation gradient and recognise that the sub-grain rotation caused by rapid dislocation movement could be the origin of granular stray grains at the bottom of the melt pool.

Date: 2023
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DOI: 10.1038/s41467-023-38727-8

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