Investigation into Spatter Particles and Their Effect on the Formation Quality
During Selective Laser Melting Processes

Wang, Zhiqiang; Wang, Xuede; Zhou, Xin; Ye, Guangzhao; Cheng, Xing; Zhang, Peiyu

doi:10.32604/cmes.2020.09934

Cited by 10 publications

(6 citation statements)

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“…In addition, the smoother surface of the balls is an indication that these are produced as a product of a melting process. Its initiation is attributed to the melt splashes due to a high capillary instability of the melt [33]. A schematic representation of the process forming this first type of balling phenomenon is illustrated in figure nine in the reference Gu et al [32].…”

Section: Characterization Of Raw/prepared Powders and Substratementioning

confidence: 99%

Powder bed selective laser process (sintering/melting) applied to tailored calcium phosphate-based powders

Navarrete-Segado¹,

Francès²,

Tourbin³

et al. 2021

Preprint

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This paper focuses on the tailoring of calcium phosphate powders for their use as powder bed selective laser process feedstock. Hydroxyapatite and chlorapatite were used as starting powders for the preparation of different blends through the addition of graphite as a laser absorptance additive. A methodical study was conducted to compare the processing windows of the blends containing different amounts of graphite through the laser patterning of circular samples. It was found that the addition of graphite increases the process window of the powder blends being the powder without additive non processable. Hydroxyapatite showed a clear phase transition (decreased when using higher volumetric energy density) into other calcium phosphate phases while chlorapatite was demonstrated to be thermally stable during the whole process (examined through X-ray diffraction and vibrational spectroscopies). In parallel, the study evaluating the powder blend composed of hydroxyapatite and graphite for the production of solid and complex parts was carried out although it required long printing times. The productivity of the process was improved by modification of printing parameters. Then, a series of solid samples were produced for the analysis of the microstructure and mechanical properties. High interconnected porosity was observed in the samples which could improve the bioactivity of the bioceramic scaffolds. A post-treatment of the parts increased their proportion in the hydroxyapatite phase and their mechanical properties. These results are expected to contribute to the application of powder bed selective laser processing of calcium phosphates powders toward bone tissue engineering.

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Section: Characterization Of Raw/prepared Powders and Substratementioning

confidence: 99%

Powder bed selective laser process (sintering/melting) applied to tailored calcium phosphate-based powders

Navarrete-Segado¹,

Francès²,

Tourbin³

et al. 2021

Preprint

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show abstract

“…Moreover, it was reported by Zhang et al (2013) and Zhao et al (2020) that energy input influences phase transition in as-built LPBF-fabricated NiTi parts. Wang et al (2020) subjected fabricated materials to postprocessing heat treatment to increase material homogeneity. This indeed reduced presence of unwanted phases and promoted formation of the NiTi phase.…”

Section: Introductionmentioning

confidence: 99%

Laser powder bed fusion (LPBF) of NiTi alloy using elemental powders: the influence of remelting on printability and microstructure

Chmielewska

Wysocki

Gadalińska

et al. 2022

RPJ

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Purpose The purpose of this paper is to investigate the effect of remelting each layer on the homogeneity of nickel-titanium (NiTi) parts fabricated from elemental nickel and titanium powders using laser powder bed fusion (LPBF). In addition, the influence of manufacturing parameters and different melting strategies, including multiple cycles of remelting, on printability and macro defects, such as pore and crack formation, have been investigated. Design/methodology/approach An LPBF process was used to manufacture NiTi alloy from elementally blended powders and was evaluated with the use of a remelting scanning strategy to improve the homogeneity of fabricated specimens. Furthermore, both single melt and up to two remeltings were used. Findings The results indicate that remelting can be beneficial for density improvement as well as chemical and phase composition homogenization. Backscattered electron mode in scanning electron microscope showed a reduction in the presence of unmixed Ni and Ti elemental powders in response to increasing the number of remelts. The microhardness values of NiTi parts for the different numbers of melts studied were similar and ranged from 487 to 495 HV. Nevertheless, it was observed that measurement error decreases as the number of remelts increases, suggesting an increase in chemical and phase composition homogeneity. However, X-ray diffraction analysis revealed the presence of multiple phases regardless of the number of melt runs. Originality/value For the first time, to the best of the authors’ knowledge, elementally blended NiTi powders were fabricated via LPBF using remelting scanning strategies.

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“…Spatter particles will contaminate the fresh powder and cause defects in the internal structure, seriously affecting the manufacturing quality of as-fabricated parts. In order to control spatter behavior, Wang et al [3] adopted the nite element method to simulate the transient temperature eld during the SLM process and study the formation mechanism of spatter. The dynamic behavior of spatter during the SLM processing was observed by a high-speed camera to verify the simulation result.…”

mentioning

confidence: 99%

Introduction to the Special Issue on Design and Simulation in AdditiveManufacturing

diwang¹,

Yang²,

YingjunWang³

et al. 2021

Computer Modeling in Engineering &Amp; Sciences

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Investigation into Spatter Particles and Their Effect on the Formation Quality During Selective Laser Melting Processes

Cited by 10 publications

References 0 publications

Powder bed selective laser process (sintering/melting) applied to tailored calcium phosphate-based powders

Powder bed selective laser process (sintering/melting) applied to tailored calcium phosphate-based powders

Laser powder bed fusion (LPBF) of NiTi alloy using elemental powders: the influence of remelting on printability and microstructure

Introduction to the Special Issue on Design and Simulation in AdditiveManufacturing

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