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Effect of Laser Beam Oscillation Process on the Interlaminar Region of Inconel 625 Alloy Thin-Walled Structure Fabricated by Oscillating Laser Additive Manufacturing

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Abstract

In the multilayer thin-walled Inconel 625 alloy structures fabricated by the laser additive manufacturing (LAM) process, the poor plasticity of the interlaminar region often leads to structural fractures. In this paper, an oscillating LAM (O-LAM) technology using a transverse linear beam oscillation (LBO) process was proposed, and the effect of laser scanning speed on the forming accuracy, microstructure, crystallographic texture, and mechanical properties of interlaminar region was studied. The results show that the LBO process refined the grains and increased the number and length of high-angle grain boundaries in the interlaminar region. In addition, the LBO process with high laser scanning speed weakened the preferential orientation along the directions of laser scanning and deposition build-up. In particular, the dominant crystallographic textures of {\(\overline{1 }10\)} <\(\overline{1 }\overline{1 }1\)> and {\(\overline{2 }21\)} <\(\overline{1 }\overline{1 }0\)> in the interlaminar region were significantly reduced. The analysis of the Schmidt factor and the results of nano-indentation test show that the LBO process with high laser scanning speed reduced the stress concentration, and the elastic modulus and dislocation density in the interlaminar region. Therefore, the LBO process with high laser scanning speed can improve the plasticity and relieve the stress concentration of the interlaminar region, which is conducive to improving the overall mechanical properties of the Inconel 625 alloy multilayer thin-walled structure.

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Data Availability

The data used to support the findings of this study are available from the corresponding author upon request.

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Acknowledgements

This work was supported by Natural Science Foundation Project of Chongqing Science and Technology Bureau of China (Grant No. cstc2021jcyj-msxmX0189), Science and Technology Research Program of Chongqing Municipal Education Commission of China (Grant No. KJZD-M202001102).

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Authors and Affiliations

  1. School of Material Science and Engineering, Chongqing University of Technology, Chongqing, 400054, People’s Republic of China

    Fuyuan Zhang, Yi Luo, Shuqing Yang, Yanrui Peng, Tao Yang & Juan Liu

  2. Chongqing Municipal Engineering Research Center of Institutions of Higher Education for Special Welding Materials and Technology, Chongqing, 400054, People’s Republic of China

    Fuyuan Zhang, Yi Luo, Shuqing Yang, Yanrui Peng, Tao Yang & Juan Liu

  3. Chongqing Yuejin Machinery Co., Ltd, Chongqing, 402160, People’s Republic of China

    Fuyuan Zhang & Shuqing Yang

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  1. Fuyuan Zhang
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Correspondence to Yi Luo.

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Zhang, F., Luo, Y., Yang, S. et al. Effect of Laser Beam Oscillation Process on the Interlaminar Region of Inconel 625 Alloy Thin-Walled Structure Fabricated by Oscillating Laser Additive Manufacturing. Met. Mater. Int. (2024). https://doi.org/10.1007/s12540-024-01660-6

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