Flow field analysis for multilaser powder bed fusion and the influence of gas flow distribution on parts quality

Liu, Zixin; Yang, Yongqiang; Wang, Di; Chen, Jie; Xiao, Yunmian; Zhou, Hanxiang; Chen, Ziyu; Song, Changhui

doi:10.1108/rpj-12-2021-0351

Cited by 14 publications

(2 citation statements)

References 25 publications

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“…Fine particles can easily be melted and generate better surface-tailored mechanical properties. Bigger particles are beneficial for higher breaking elongations, which are equal to the same strains as conventional wrought materials (Liu et al , 2022). LB-PBF of Al-based alloys showed similar mechanical properties to conventional methods.…”

Section: Characteristics Of Produced Componentsmentioning

confidence: 99%

Laser subtractive and laser powder bed fusion of metals: review of process and production features

Khorasani¹,

Gibson

Ghasemi³

et al. 2023

RPJ

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Purpose The purpose of this study is, to compare laser-based additive manufacturing and subtractive methods. Laser-based manufacturing is a widely used, noncontact, advanced manufacturing technique, which can be applied to a very wide range of materials, with particular emphasis on metals. In this paper, the governing principles of both laser-based subtractive of metals (LB-SM) and laser-based powder bed fusion (LB-PBF) of metallic materials are discussed and evaluated in terms of performance and capabilities. Using the principles of both laser-based methods, some new potential hybrid additive manufacturing options are discussed. Design methodology approach Production characteristics, such as surface quality, dimensional accuracy, material range, mechanical properties and applications, are reviewed and discussed. The process parameters for both LB-PBF and LB-SM were identified, and different factors that caused defects in both processes are explored. Advantages, disadvantages and limitations are explained and analyzed to shed light on the process selection for both additive and subtractive processes. Findings The performance of subtractive and additive processes is highly related to the material properties, such as diffusivity, reflectivity, thermal conductivity as well as laser parameters. LB-PBF has more influential factors affecting the quality of produced parts and is a more complex process. Both LB-SM and LB-PBF are flexible manufacturing methods that can be applied to a wide range of materials; however, they both suffer from low energy efficiency and production rate. These may be useful when producing highly innovative parts detailed, hollow products, such as medical implants. Originality value This paper reviews the literature for both LB-PBF and LB-SM; nevertheless, the main contributions of this paper are twofold. To the best of the authors’ knowledge, this paper is one of the first to discuss the effect of the production process (both additive and subtractive) on the quality of the produced components. Also, some options for the hybrid capability of both LB-PBF and LB-SM are suggested to produce complex components with the desired macro- and microscale features.

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Section: Characteristics Of Produced Componentsmentioning

confidence: 99%

Laser subtractive and laser powder bed fusion of metals: review of process and production features

Khorasani¹,

Gibson

Ghasemi³

et al. 2023

RPJ

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“…LBPBF provides improvements in product quality, processing time and manufacturing reliability compared to binder-based laser sintering AM processes. In fact, stainless steel 316 L, AlSi10Mg, Cu 2 O and many other materials have been used to fabricate components using LBPBF technology, and the influence of parameters on the microstructure and properties was also investigated by researchers [16][17][18][19]. As far as low melting point alloys are concerned, few studies on additive manufacturing have been conducted.…”

Section: Introductionmentioning

confidence: 99%

Microstructure and Mechanical Properties of Sn58Bi Components Prepared by Laser Beam Powder Bed Fusion

Yang

Ding

Sun

et al. 2022

Metals

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As a low melting point alloy, Sn58Bi alloy plays a unique role in many fields. However, the brittleness of Sn58Bi alloy is a limitation that has to be addressed for wider applications. According to previous studies, third element addition is favorable for improved ductility, which is attributable to structure refinement. Therefore, laser beam powder bed fusion technology was adopted to prepare Sn58Bi alloy components. Additionally, the as-printed specimens presented more refined structures compared to the as-cast specimen, so they showed better plasticity. The Sn58Bi alloy showed excellent formability when specimens were prepared by LBPBF between 40–80 W. The density of specimens nearly remained stable above laser power higher than 40 W, and CT scanning could not detect internal defects, so the Sn58Bi alloy specimen was likely to be well fabricated at high laser power. Within the laser power range of 40–80 W, with the variation of laser power or scanning velocity, the laser energy density changed accordingly, and the mechanical strength of specimens was improved with the increase of laser power density. This strength change was probably related to the microstructure evolution and internal residual stress in the printing process.

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Frontiers in Laser Additive Manufacturing Technology

Yang,

Jiang,

Han

et al. 2024

Additive Manufacturing Frontiers

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Flow field analysis for multilaser powder bed fusion and the influence of gas flow distribution on parts quality

Cited by 14 publications

References 25 publications

Laser subtractive and laser powder bed fusion of metals: review of process and production features

Laser subtractive and laser powder bed fusion of metals: review of process and production features

Microstructure and Mechanical Properties of Sn58Bi Components Prepared by Laser Beam Powder Bed Fusion

Frontiers in Laser Additive Manufacturing Technology

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