Comparative investigation on grindability of Inconel 718 made by selective laser melting (SLM) and casting

Liu, Zhonglei; Li, Xuekun; Wang, Xiaodan; Tian, Chenchen; Wang, Liping

doi:10.1007/s00170-018-2850-8

Cited by 23 publications

(9 citation statements)

References 38 publications

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“…It is difficult to prepare complex-shaped parts for aerospace via conventional manufacturing technology [1,2] . The additive manufacturing (AM) technology provides a path to solve these problems, and selective laser melting (SLM) technology is one of the most rapidly developed metal AM techniques in recent years [3][4][5] . Metal parts are obtained by laser melting metal powder using a layer by layer method with a rapid cooling rate [6][7][8][9][10][11] .…”

Section: Introductionmentioning

confidence: 99%

Microstructure and properties of AlSi7Mg alloy fabricated by selective laser melting

et al. 2021

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The AlSi7Mg alloy was fabricated by selective laser melting (SLM), and its microstructure and properties at different building directions after heat treatment were analyzed. Results show that the microstructure of SLM AlSi7Mg samples containes three zones: fine grain zone, coarse grain zone, and heat affected zone. The fine-grain regions locate inside the molten pool, and the grains are equiaxed. The coarse-grain regions locate in the overlap of molten pools. After T6 treatment, the microstructure at the molten pool boundary is still the network eutectic Si, but the network structure becomes discrete, and is composed of intermittent, chain-like eutectic Si particles. The yield strength at three directions (xy, 45°, z direction) of the AlSi7Mg alloy samples fabricated by SLM is improved after T6 heat treatment. The fracture mechanism of the samples is a mixed ductile and brittle fracture before heat treatment and ductile fracture after heat treatment.

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Section: Introductionmentioning

confidence: 99%

Microstructure and properties of AlSi7Mg alloy fabricated by selective laser melting

et al. 2021

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“…Unused metal powder was recycled through recovery system and the whole process was completed in inert shielding gas atmosphere. 11,12 Much research has been done on the performance of parts based on the SLM processing parameters. Considerable literature showed that SLM process is influenced by different factors and some of these parameters are worth of attention.…”

Section: Introductionmentioning

confidence: 99%

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:

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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.

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“…Differences with respect to the results of finishing were also documented between a L-PBF Inconel 718 and a cast reference in grinding. Regarding the additively manufactured material, the grinding wheel wear was less, the surfaces were rougher, and the hardness in the surface layer was smaller than at the cast specimens [29].…”

Section: Introductionmentioning

confidence: 93%

Analysis of the machinability when milling AlSi10Mg additively manufactured via laser-based powder bed fusion

Zimmermann

Müller

Kirsch

et al. 2020

Int J Adv Manuf Technol

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Laser-based powder bed fusion (L-PBF) is a promising technology for the production of near net–shaped metallic components. The high surface roughness and the comparatively low-dimensional accuracy of such components, however, usually require a finishing by a subtractive process such as milling or grinding in order to meet the requirements of the application. Materials manufactured via L-PBF are characterized by a unique microstructure and anisotropic material properties. These specific properties could also affect the subtractive processes themselves. In this paper, the effect of L-PBF on the machinability of the aluminum alloy AlSi10Mg is explored when milling. The chips, the process forces, the surface morphology, the microhardness, and the burr formation are analyzed in dependence on the manufacturing parameter settings used for L-PBF and the direction of feed motion of the end mill relative to the build-up direction of the parts. The results are compared with a conventionally cast AlSi10Mg. The analysis shows that L-PBF influences the machinability. Differences between the reference and the L-PBF AlSi10Mg were observed in the chip form, the process forces, the surface morphology, and the burr formation. The initial manufacturing method of the part thus needs to be considered during the design of the finishing process to achieve suitable results.

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Comparative investigation on grindability of Inconel 718 made by selective laser melting (SLM) and casting

Cited by 23 publications

References 38 publications

Microstructure and properties of AlSi7Mg alloy fabricated by selective laser melting

Microstructure and properties of AlSi7Mg alloy fabricated by selective laser melting

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

Analysis of the machinability when milling AlSi10Mg additively manufactured via laser-based powder bed fusion

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