Study of the spatter distribution on the powder bed during selective laser melting

Anwar, Ahmad Bin; Pham, Quang-Cuong

doi:10.1016/j.addma.2018.04.036

Cited by 60 publications

(46 citation statements)

References 42 publications

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“…spatter particles possessed lower initial velocities resulting in signi cantly shorter distances travelled both horizontally and vertically. Also, as seen from our earlier work (Anwar & Pham, 2018), the particles that are deposited in regions B to D had Stk numbers close to or greater than 1 due to their large diameter values which reached close to 180 µm. Despite the large contrast in spatter diameters between simulation and experiment results, a good agreement has been reached in terms of the trend of the size distribution.…”

Section: Validation For Size Distributionssupporting

confidence: 72%

“…The simulation results were then validated with an earlier study on spatter mass and size distributions on the powder bed, speci cally in regions A to D as labelled in Fig. 5.1 (Anwar & Pham, 2018). Figure 5.1: Schematic of spatter ejection from melt pool and its transport by the inert gas ow (green arrows) in the −x direction.…”

Section: Resultsmentioning

confidence: 71%

“…In their work, the hot and cold ejections were stated to have diameters no larger than the fresh powder, at 30 µm, while the size distribution of the particles ejected due to recoil pressure were comparable and some were even larger that the fresh powder. However, in our earlier experimental study (Anwar & Pham, 2018), all the analysed particles were bigger in size than the fresh powder as particles smaller than 63 µm had been sieved out. Therefore, we attribute the sizes of the collected particles to be due to possible coalescence e ects between molten droplets before solidi cation, and also sintering between hot ejections as observed by Ly et al (2017).…”

Section: Initial Conditions For Spa Er Ejection Profilesmentioning

confidence: 82%

“…However, in this study, the dimensions of the ejection sites were 80 × 0.1 mm (in the x and y axis respectively). The length of 80 mm corresponds to a single scan vector as applied in our earlier work (Anwar & Pham, 2018), while the width of 0.1 mm or 100 µm represents that of a single melt pool.…”

Section: Boundary Conditionsmentioning

confidence: 99%

“…The laser power and speed was set to 200 W and 1 m/s respectively. With a 67% Average Figure 5.3: Spatter particle size distributions obtained experimentally (Anwar & Pham, 2018).…”

Section: Ejection Anglesmentioning

confidence: 99%

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Large scale selective laser melting : study of the effects and removal of spatter by the inert gas flow

Anwar¹

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Section: Validation For Size Distributionssupporting

confidence: 72%

Section: Resultsmentioning

confidence: 71%

Section: Initial Conditions For Spa Er Ejection Profilesmentioning

confidence: 82%

Section: Boundary Conditionsmentioning

confidence: 99%

“…The laser power and speed was set to 200 W and 1 m/s respectively. With a 67% Average Figure 5.3: Spatter particle size distributions obtained experimentally (Anwar & Pham, 2018).…”

Section: Ejection Anglesmentioning

confidence: 99%

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Large scale selective laser melting : study of the effects and removal of spatter by the inert gas flow

Anwar¹

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Regulating Oxides Enhances the Mechanical Properties of Additively Manufactured Martensitic Stainless Steel

Zhao,

Li,

Yin

et al. 2024

steel research int.

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Laser powder bed fusion (LPBF), a subset of additive manufacturing, is used increasingly to produce martensitic stainless steels (MSSs) for aerospace and medical devices. However, excessive oxygen content in MSS powder generally impairs the mechanical properties of parts produced via LPBF. To investigate the effect of oxides on additively manufactured MSS, this study utilizes powders with various oxygen contents and printed numerous samples under different parameters. This article systematically analyzes the source, morphology, and distribution of oxides in MSS samples and their effects on the microstructure and mechanical properties. It is found that MSS samples printed with high‐oxygen powder exhibit higher strength and hardness. The average hardness of high‐oxygen powder‐printed samples increases by 14.2 HV3 over low‐oxygen samples. Additionally, their average tensile and yield strengths of 1025.97 and 809.18 MPa show increases of 3.36% and 17.33%, respectively. This provides a reference for regulating oxides in additively manufactured MSS and potentially benefiting from them.

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Evaluation of spatter particles, metal vapour jets, and depressions considering influence of laser incident angle on melt pool behaviour

Tsubouchi

Furumoto

Yamaguchi

et al. 2022

Int J Adv Manuf Technol

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Building of practical parts involves the application of metal-based laser powder bed fusion using a laser beam (PBF-LB/M) owing to its high-precision manufacturing. However, the quality of the built parts obtained via the PBF-LB/M processes varies with the building conditions, and a thorough understanding of the building mechanism has not been achieved owing to the complex and interrelated process parameters involved. The incident angle of the laser beam, which changes on the platform during the laser beam scan owing to the designed three-dimensional data, is among the principal parameters that affects the building aspects. In this study, the melt pool in the singletrack formation during the PBF-LB/M processes was visualised using a high-speed camera, and the influence of the laser incident angle on the ejection characteristics of spatter particles formed around the laser-irradiated area was investigated. Consequently, the spatter particles and metal vapour jet behaviour varied with the laser incident angle. There was a reduction in number of spatter particles owing to the origin of the incident direction being from behind the laser irradiation area. In addition, the laser incident angle also affected the melt pool morphology because of the depression in the melting. Furthermore, the burial depth of the pores varied with the laser incident angle, and is related to the depth of the depression during the melt pool formation.

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Study of the spatter distribution on the powder bed during selective laser melting

Cited by 60 publications

References 42 publications

Large scale selective laser melting : study of the effects and removal of spatter by the inert gas flow

Large scale selective laser melting : study of the effects and removal of spatter by the inert gas flow

Regulating Oxides Enhances the Mechanical Properties of Additively Manufactured Martensitic Stainless Steel

Evaluation of spatter particles, metal vapour jets, and depressions considering influence of laser incident angle on melt pool behaviour

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