Temperature Field During Selective Laser Melting of Metal Powder Under Different Scanning Strategies

Dening, 陈德宁 Chen; Tingting, 刘婷婷 Liu; Wenhe, 廖文和 Liao; Changdong, 张长东 Zhang; Kai, 张凯 Zhang

doi:10.3788/cjl201643.0403003

Cited by 6 publications

(3 citation statements)

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“…Meanwhile, the partition scanning strategy has a pre-heating effect on adjacent zones, thereby dropping the thermal gradient. Hence, the temperature field of the adjoining scanning zone became uniform, and the corresponding residual stress was also reduced [18,21,22,44]. In this work, the grid size of the sample fabricated using the chessboard partition scanning strategy was the smallest and obtained the lowest thermal gradient and uniform temperature field.…”

Section: Discussionmentioning

confidence: 75%

“…However, the significant temperature gradient, fast cooling rate, and repeated re-melting processing, during SLM, lead to excessive-high residual stress in the as-fabricated parts, resulting in warpage and cracks [17,18]. The warpage and cracks degrade the mechanical properties of SLM parts [19][20][21][22], and bring challenges to the SLM fabrication of high-quality components.…”

Section: Introductionmentioning

confidence: 99%

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Cracking Behavior of René 104 Nickel-Based Superalloy Prepared by Selective Laser Melting Using Different Scanning Strategies

et al. 2020

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Eliminating cracks is a big challenge for the selective laser melting (SLM) process of low-weldable Nickel-based superalloy. In this work, three scanning strategies of the snake, stripe partition, and chessboard partition were utilized to prepare René 104 Ni-based superalloy, of which the cracking behavior and the residual stress were investigated. The results showed that the scanning strategies had significant effects on the cracking, residual stress, and relative density of the SLMed René 104 superalloy. The scanning strategies with more partitions boosted the emergence of cracks, as high-density cracks occurred in these samples. The overlapping zone (OZ) of the scanning partition was also susceptible to cracking, which increased the size, number, and density of the cracks. The cracking performance was relatively moderate in the snake-scanned samples, while that in the chessboard-partition-scanned samples was the most severe. It is concluded that the partition scanning strategies induced more cracks in the SLMed René 104 superalloy, of which the residual stress was apparently reduced. Therefore, it is necessary to design scanning strategies with optimized scanning partitions and overlaps to avoid cracking and acquire a high-quality, near fully dense, low-weldable Nickel-based superalloy using SLM.

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Section: Discussionmentioning

confidence: 75%

Section: Introductionmentioning

confidence: 99%

Cracking Behavior of René 104 Nickel-Based Superalloy Prepared by Selective Laser Melting Using Different Scanning Strategies

et al. 2020

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“…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). Li et al studied the changes of temperature field, stress field and strain field under different scanning lengths based on thermal-structural coupling simulation and carried out corresponding experiments (Li et al, 2018).…”

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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Mechanical properties of AlSi10Mg alloy fabricated by laser melting deposition and improvements via heat treatment

Shen

Liang

et al. 2019

Optik

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Temperature Field During Selective Laser Melting of Metal Powder Under Different Scanning Strategies

Cited by 6 publications

References 0 publications

Cracking Behavior of René 104 Nickel-Based Superalloy Prepared by Selective Laser Melting Using Different Scanning Strategies

Cracking Behavior of René 104 Nickel-Based Superalloy Prepared by Selective Laser Melting Using Different Scanning Strategies

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

Mechanical properties of AlSi10Mg alloy fabricated by laser melting deposition and improvements via heat treatment

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