Abstract
Nodular cast iron is widely used in the industrial field, but its wear resistance and corrosion resistance are poor. Laser cladding technology is an effective way to strengthen its surface. The cladding layer is formed by multi-track sequential overlapping. The thermal-elastic–plastic-flow coupling evolution behaviors among different cladding channels have a direct interaction. Quantitatively revealing the multi-field coupling correlation is significant for optimizing process parameters and effectively improving the quality of cladding layer. In this paper, a multi-field coupling model of nodular cast iron with multi-track overlapping in laser cladding is established, which reveals the instantaneous evolution law and correlation effects. The calculation shows that the maximum temperature of the first cladding is 2500 K, the maximum stress is 417 MPa, the stress area presents a shrinkage band distribution, and the maximum flow velocity of the molten pool is 0.24 m/s. Under the influence of active elements, the Marangoni flow direction will be reversed. The two cladding mechanisms of sequential overlapping cladding and the second cladding after air cooling to room temperature were compared and analyzed. The result shows that the energy accumulation is greater under the first cladding mechanism; the temperature and the steady-state flow rate are relatively high. Under the second cladding mechanism, the change of flow velocity is not obvious. The size and micromorphology of the cladding layer were observed by the Therom Scientific Apreo 2S field emission SEM, and the cladding temperature at different positions was measured by the Testo 885 thermal imager, verified the validity of the model.
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Funding
This work was supported by Innovation Talent Support Plan Program of Higher Education Institutions of Liaoning Province (20201020) and National Key R&D Program “Advanced Structures and Composite Materials” of China (2021YFB3702002).
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Han, X., Li, C., Xu, Y. et al. Correlation research on multi-field coupling of multi-track overlapping laser cladding process for nodular cast iron. Int J Adv Manuf Technol 121, 5707–5729 (2022). https://doi.org/10.1007/s00170-022-09842-5
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DOI: https://doi.org/10.1007/s00170-022-09842-5