Optimizing the structure accuracy by changing the scanning strategy using selective laser melting

Han, Jitai; Wu, Meiping; Ge, Yanan; Jian, Wu

doi:10.1007/s00170-017-1503-7

Cited by 28 publications

(12 citation statements)

References 14 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…Among the most commonly parameters is scanning strategy, laser power, scanning speed, hatch spacing and current study focusing on the adjustment of the above parameters and multi-objective optimization. [13][14][15][16][17][18][19][20][21][22][23] To our best knowledge, those above parameters are closely related to laser energy density. Laser energy density, a function of laser power, scan speed, hatch spacing and layer thickness, plays a prominent role in the process of forming parts via SLM.…”

Section: Introductionmentioning

confidence: 95%

Effect of defocusing distance on the forming quality of inner structure parts manufactured via selective laser melting

Duan

Han

et al. 2021

Proceedings of the Institution of Mechanical Engineers, Part E:

Self Cite

View full text Add to dashboard Cite

A systematical work was studied to illustrate the influence of defocusing distance on the forming quality of inner structure fabricated by selective laser melting for Ti-6Al-4V alloy. The relationship between defocusing distance and dimensional accuracy, surface roughness as well as flatness was investigated, finite element analysis (FEA) was used to show the temperature distribution. The results show that defocusing distance not only had an impact on laser energy density, but also showed a significant influence on the surface pressure of the metal powder. Smaller defocusing distance (0.0 mm) accompanied with higher molten pool maximum temperature (3262.96°C), powder melting and splashing at the same time. On the contrary, larger defocusing distance leading to unmelted powder and powder bonding, which influences the forming quality of samples. Dimensional accuracy was less affected in 0.0, 1.0, 2.0 mm defocusing distance (5%), but changed dramatically when it is 3.0 mm (22%). In the same condition, similar variation trend of surface roughness (Ra) and flatness was observed, and varying from 5.1 to 27.3 μm and 0.05 to 0.26 mm, respectively. Simultaneously, the bottom surface is less affected, while the other three sides have the opposite situation. Pores and unmelted powder can be seen on the surface, it is the comprehensive effect of laser energy density and surface pressure. It proves that it is feasible to manufacture inner structure by controlling this process parameter during SLM process, the influence mechanism of defocusing distance on forming quality was also illustrated in this work.

show abstract

Section: Introductionmentioning

confidence: 95%

Effect of defocusing distance on the forming quality of inner structure parts manufactured via selective laser melting

Duan

Han

et al. 2021

Proceedings of the Institution of Mechanical Engineers, Part E:

Self Cite

View full text Add to dashboard Cite

show abstract

“…In contrast, the vertical and diagonally oriented specimens [(Z), (XZ45) and (YZ45)] had a lower average surface roughness of Ra = 2.4 m m. The laser scanning strategy has been shown in a number of studies to contribute to the surface roughness of additively manufactured parts. One study has reported that scanning strategy governs top and side surface roughness, with the most pronounced impact on the side surface (Han et al, 2018). The stair-stepping effect, which occurs due to the layer-by-layer deposition process has a more pronounced impact on the side surface roughness and is highly dependent on the build angle orientation (Delfs et al, 2015).…”

Section: Resultsmentioning

confidence: 99%

Cyclic shear response of additively manufactured Inconel 718

Siddiqui

Gordon

2020

RPJ

View full text Add to dashboard Cite

Purpose Additive manufacturing (AM) studies on Inconel 718 (IN718) have focused on exploring its tensile and fatigue response. As IN718 is used in the propulsion and energy sector, the impact of shearing is also critical to ensuring the durability of these components. As such, this study aims to explore the relation between build orientation on the shear cyclic response of direct metal laser sintered (DMLS) IN718. Design/methodology/approach IN718 torsion specimens were manufactured along six build orientations: (100)-X, (010)-Y, (001)-Z, (110)-XY45, (101)-XZ45 and (011)-YZ45, using the DMLS process. Torsional fatigue testing was performed on as-built specimens, from which fracture behavior, surface roughness, softening/hardening response and monotonic/cyclic shear torsional properties were assessed. Findings DMLS IN718 was found to exhibit transversely isotropic behavior. In terms of shear stress range and shear modulus, Z > (X, XY45, Y) > (XZ45, YZ45). Specimens cyclically hardened to stabilization and softened to fracture. In terms of torsional fatigue fracture response, the Z, XZ45 and YZ45 specimens exhibited crack initiation and propagation from internal defects, whereas cracks were found to initiate at the surface and propagate between and through build layers for the X, Y and XY45 specimens. Originality/value This study reports the torsional cyclic response and shear moduli exhibited by as-built DMLS IN718 manufactured along varying build orientations. The findings are applicable for researchers because of the wide use of IN718 in the gas turbine industry, and the current trend to replace conventional manufacturing with AM.

show abstract

“…However, due to the limitation of the traditional manufacturing method, it is hard to manufacture complex inner structure which poses an obstacle for its further development. [1][2][3][4] In the past few decades, additive manufacturing (AM), which is commonly called 3D printing, has been more and more widely used in industrial engineering. [5][6][7][8][9][10] Selective laser melting (SLM), which in known as one of the most widely used AM method, attracted an increasing attentions from different kinds of fields, such as aerospace industry, military industry, automotive field, and so on due to its feasible to print metal parts with the material want to use.…”

Section: Introductionmentioning

confidence: 99%

“…However, due to the limitation of the traditional manufacturing method, it is hard to manufacture complex inner structure which poses an obstacle for its further development. 1-4…”

Section: Introductionmentioning

confidence: 99%

Effect of layer thickness on the overhanging surface quality manufactured by selective laser melting

Duan

Han³

et al. 2021

Proceedings of the Institution of Mechanical Engineers, Part C:

Self Cite

View full text Add to dashboard Cite

With the increasing demand for the precision of lightweight part, overhanging surface quality has attracted more and more attentions in recent years. In this work, the relationship between overhanging surface quality and layer thickness was studied. The testing results revealed that with the increasing of the layer thickness, surface quality, especially the surface flatness, showed a significant decreasing trend due to the decreasing of the bending deformation. When layer thickness was ranged from 0.15 to 0.18, it reached a relative optimal condition while the sinking distance and flatness within 0.095 mm–0.1 mm and 0.076 mm–0.078 mm, respectively. With the further increasing of the layer thickness, both sinking distance and surface flatness had a quite significant decreasing due to the increasing gravity of the overhanging layer powder and bonded powder caused by the molten pool sinking. Combined to the experimental data and the analysis given above, the structure of the overhanging surface was optimized and the surface quality showed a further increase.

show abstract

Optimizing the structure accuracy by changing the scanning strategy using selective laser melting

Cited by 28 publications

References 14 publications

Effect of defocusing distance on the forming quality of inner structure parts manufactured via selective laser melting

Effect of defocusing distance on the forming quality of inner structure parts manufactured via selective laser melting

Cyclic shear response of additively manufactured Inconel 718

Effect of layer thickness on the overhanging surface quality manufactured by selective laser melting

Contact Info

Product

Resources

About