Transient Finite Elements Analysis of Thin-Walled Structure in Selective Laser Melting Process

Ding, Linshan; Zhang, Li; Ruan, Chunhong; Jiang, Zaizhuo

doi:10.1007/978-3-319-95588-9_106

Cited by 1 publication

(1 citation statement)

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“…At the same time, due to the balance of force and momentum, the bottom region will be converted into compressive stress. For multichannel and multilayer thinwalled parts, the optimization of the scanning strategy is the key method to control the residual stress and deformation (Ding, 2018;Xv, 2016). Chen et al established a three-dimensional transient finite element model to analyze the influence of island scanning strategy and serpentine scanning strategy on the overall temperature field of the horizontal thin-walled plate, and further pointed out that the finite element model can not only capture temperature field changes but also provide a feasible idea for precise control of metallographic directional growth (Chen et al, 2016).…”

Section: Introductionmentioning

confidence: 99%

The effect of rescanning strategy on residual stress and deformation of laser-based powder bed fusion of 316L stainless steel thin-walled parts

Wang

Cao

Chang

2023

RPJ

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Purpose Laser-based powder bed fusion (LPBF) is a new method for forming thin-walled parts, but large cooling rates and temperature gradients can lead to large residual stresses and deformations in the part. This study aims to reduce the residual stress and deformation of thin-walled parts by a specific laser rescanning strategy. Design/methodology/approach A three-dimensional transient finite element model is established to numerically simulate the LPBF forming process of multilayer and multitrack thin-walled parts. By changing the defocus amount, the laser in situ annealing process is designed, and the optimal rescanning parameters are obtained, which are verified by experiments. Findings The results show that the annealing effect is related to the average surface temperature and scan time. When the laser power is 30 W and the scanning speed is 20 mm/s, the overall residual stress and deformation of the thin-walled parts are the smallest, and the in situ annealing effect is the best. When the annealing frequency is reduced to once every three layers, the total annealing time can be reduced by more than 60%. Originality/value The research results can help better understand the influence mechanism of laser in situ annealing process on residual stress and deformation in LPBF and provide guidance for reducing residual stress and deformation of LPBF thin-walled parts.

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Section: Introductionmentioning

confidence: 99%