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Multiphysics coupling in situ measurement method for laser repair of the Inconel 718 alloy structure

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Abstract

As an additive manufacturing technique, the laser-aided direct energy deposition (L-DED) method has been widely used for component repair (also called laser repair). With significant differences from traditional manufacturing techniques, the laser repair process has the characteristics of point-by-point deposition and has a high-temperature gradient in the repair area, resulting in the formation of heterogeneous thermal deformation and residual stress after cooling. High stress may lead to the appearance of cracks in the repair area and may seriously influence the bearing capacity of the repaired parts. Therefore, the characterization of the temperature and deformation fields of the components during laser repair is important for the analysis of the mechanism of damage evolution in the repair area, optimization of the process parameters, and improvement of the mechanical properties of the repaired components. Because of the demand for the simultaneous measurement of the temperature and deformation fields, using a multispectral camera and a self-designed three-peak filter, a temperature-deformation field measurement technique was developed and applied to in situ monitoring during the L-DED manufacturing process. In the actual measurement process, the synchronous measurement of the temperature field of the laser molten pool and the deformation field of the side surface of the repaired component were realized using the images of multiple channels in the multispectral camera. The experimental results verify that a three-peak filter can effectively eliminate the influences of glare and overexposure on the recorded multispectral images. Moreover, the amplitude of the displacement field and the temperature gradient of the repaired component will increase with the increase in laser power, which may affect the final molding of the repaired component. This work extends the function of the multispectral camera to measure the temperature and deformation fields and provides a new measurement method for further optimizing the process parameters of laser repair.

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Authors and Affiliations

  1. School of Aerospace Engineering, Tsinghua University, Beijing, 100084, China

    WenXiong Shi, ChengHao Zhang, Ru Chen, HuiMin Xie & Fei Liu

Authors
  1. WenXiong Shi
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  2. ChengHao Zhang
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  3. Ru Chen
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  4. HuiMin Xie
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  5. Fei Liu
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Corresponding authors

Correspondence to HuiMin Xie or Fei Liu.

Additional information

This work was supported by the National Natural Science Foundation of China (Grant Nos. 12032013 and 11972209) and the National Key Research and Development Program of China (Grant No. 2017YFB1103900).

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Shi, W., Zhang, C., Chen, R. et al. Multiphysics coupling in situ measurement method for laser repair of the Inconel 718 alloy structure. Sci. China Technol. Sci. 66, 2986–2995 (2023). https://doi.org/10.1007/s11431-022-2419-7

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  • DOI: https://doi.org/10.1007/s11431-022-2419-7

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