Abstract
In this paper, an in situ integration of the laser-assisted powder-based directed energy deposition (DED) process with a post-processing surface engineering technique called an ultrasonic nanocrystal surface modification (UNSM) is presented and analyzed with a multiphysics computational approach. The goal of this integrated process is to improve the quality of the DED built part by mitigating the high magnitude tensile residual stress in the built layer by incorporating compressive residual stress. The multiphysics, multi-scale computational modeling approach involves a meso-scale computational fluid dynamics (CFD) model interfaced with a macro-scale finite element method (FEM). The CFD model simulates powder feeding, transient thermal gradient, heat transfer, and laser-assisted powder-based DED melt pool dynamics. This model is then coupled with FEM to evaluate the effect of the UNSM process on the residual stress. The simulation results show that UNSM incorporates compressive residual stress to a depth of ~800 μm for a single built layer of ~1100 μm and shifts a region with an average of ~170 MPa tensile residual stress into one with an average of ~600 MPa compressive stress.
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Funding
Lu received financial support from NSF, DE-NA0003962 and DE-NA-0003525, under CMMI-1726435, and the Louis A. Beecherl Jr. endowed chair. Qian also received financial support from NSF under CMMI-1335204.
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Nagaraja, K.M., Li, W., Qian, D. et al. Multiphysics modeling of in situ integration of directed energy deposition with ultrasonic nanocrystal surface modification. Int J Adv Manuf Technol 120, 5299–5310 (2022). https://doi.org/10.1007/s00170-022-09082-7
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DOI: https://doi.org/10.1007/s00170-022-09082-7