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<p>The effect of high-speed laser cladding process parameters with Fe-based alloy powder on 45 steel substrates on the macroscopic morphology and microstructure of the cladding of cutting head is investigated. A thermal-force coupling model of a dual-ellipsoid heat source for high-speed laser cladding was established. The results of numerical simulation were then used to analyze the temperature field distribution in the cladding. Verification of simulation results performed for cladding mode at 2000 W laser power, 6 m/min scan speed and 18.18 g/min powder feed rate showed their good agreement with experimental data. Comparison of simulation and experiment results showed that the cross-sectional morphology of the coating closely matched the simulation predictions with a maximum size deviation of 8.3%. It was found that the scan speed and powder feed rate significantly affected the width and height of the coating. The microstructure of the coating is influenced by the temperature gradient and solidification rate in the melt pool. The temperature gradient at the top of the coating was approximately one-third of that at the bottom, whereas the solidification rate was eight times higher at the top, resulting in fine grains in the upper region. Overall, high-speed laser cladding produced a refined and more uniformly grown microstructure from bottom to top.</p>

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Dynamic Prediction of Macro-Geometry and Microstructure Analysis of High-Speed Laser Cladding

  • 期刊论文

  • 发表日期：

    2025年11月1日

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  • Shirui Guo,
  • Shouwen Ding,
  • Quanbin Du,
  • Shuisheng Chen,
  • Chuan Guo,
  • Lujun Cui,
  • Yinghao Cui,
  • Xiaolei Li,
  • Yongqian Chen,
  • Yue Zhao,
  • Bo Zheng

摘要

The effect of high-speed laser cladding process parameters with Fe-based alloy powder on 45 steel substrates on the macroscopic morphology and microstructure of the cladding of cutting head is investigated. A thermal-force coupling model of a dual-ellipsoid heat source for high-speed laser cladding was established. The results of numerical simulation were then used to analyze the temperature field distribution in the cladding. Verification of simulation results performed for cladding mode at 2000 W laser power, 6 m/min scan speed and 18.18 g/min powder feed rate showed their good agreement with experimental data. Comparison of simulation and experiment results showed that the cross-sectional morphology of the coating closely matched the simulation predictions with a maximum size deviation of 8.3%. It was found that the scan speed and powder feed rate significantly affected the width and height of the coating. The microstructure of the coating is influenced by the temperature gradient and solidification rate in the melt pool. The temperature gradient at the top of the coating was approximately one-third of that at the bottom, whereas the solidification rate was eight times higher at the top, resulting in fine grains in the upper region. Overall, high-speed laser cladding produced a refined and more uniformly grown microstructure from bottom to top.