Laser Additive Manufacturing of High-Performance Materials

Gu, Dongdong

doi:10.1007/978-3-662-46089-4

Cited by 184 publications

(159 citation statements)

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“…Extremely short interaction time between the laser beam and the powder bed results in the formation of a transient temperature field with a high temperature up to 10 5 • C and a significant rapid quenching effect with very high cooling rates up to 10 6-8 • C/s [38]. Rapid solidification may cause development of non-equilibrium metallurgical phenomena such as microstructural refinement, solid solution hardening and the formation of metastable phases, which can have a substantial effect in improving the resultant mechanical properties and corrosion resistance of the laser processed materials [39,40].…”

Section: Selective Laser Melting (Slm) Technologymentioning

confidence: 99%

“…Another major advantage of SLM lies in its high feasibility in processing non-ferrous pure metals like Ti, Al, Cu, Mg, etc., which to date cannot be well processed using SLS [39]. Some common materials that have been investigated for SLM include: ferrous alloys, titanium, cobalt-chrome, nickel, aluminium, magnesium, copper, zinc, tungsten, and gold [41].…”

Section: Selective Laser Melting (Slm) Technologymentioning

confidence: 99%

“…Further, it was also observed that the content of Mg decreased in the laser-melted region because of selective evaporation with the increase in laser energy density. Reports also indicate that the type and mode of the laser beam used can affect the microstructures formed in SLM processed magnesium as the resultant consolidation mechanism of metallic powders is a function of energy density delivered [39]. Ng et al [57] compared microstructures of the tracks formed in SLM processing of magnesium powders, processed under both continuous and pulsed mode of irradiation.…”

Section: Figurementioning

confidence: 99%

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Selective Laser Melting of Magnesium and Magnesium Alloy Powders: A Review

Manakari

Parande

Gupta

2016

Metals

185

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Magnesium-based materials are used primarily in developing lightweight structures owing to their lower density. Further, being biocompatible they offer potential for use as bioresorbable materials for degradable bone replacement implants. The design and manufacture of complex shaped components made of magnesium with good quality are in high demand in the automotive, aerospace, and biomedical areas. Selective laser melting (SLM) is becoming a powerful additive manufacturing technology, enabling the manufacture of customized, complex metallic designs. This article reviews the recent progress in the SLM of magnesium based materials. Effects of SLM process parameters and powder properties on the processing and densification of the magnesium alloys are discussed in detail. The microstructure and metallurgical defects encountered in the SLM processed parts are described. Applications of SLM for potential biomedical applications in magnesium alloys are also addressed. Finally, the paper summarizes the findings from this review together with some proposed future challenges for advancing the knowledge in the SLM processing of magnesium alloy powders.

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Section: Selective Laser Melting (Slm) Technologymentioning

confidence: 99%

Section: Selective Laser Melting (Slm) Technologymentioning

confidence: 99%

Section: Figurementioning

confidence: 99%

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Selective Laser Melting of Magnesium and Magnesium Alloy Powders: A Review

Manakari

Parande

Gupta

2016

Metals

185

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“…Selective laser melting (SLM) is a metal additive manufacturing technology which can directly fabricate parts following the design or acquisition of complex 3D models using computer techniques. This is done by directly melting metal or alloy powders using a high-energy laser beam, depending on the information of each slice of the model, and each part is manufactured in a stacked manner [8]. The density of SLM-fabricated parts has reached over 99% due to continuous development of the manufacturing technique, and a dimensional error could be controlled within 0.05 mm.…”

Section: Introductionmentioning

confidence: 99%

Research on Selective Laser Melting of Ti6Al4V: Surface Morphologies, Optimized Processing Zone, and Ductility Improvement Mechanism

Wang

Dou

Yang

2018

Metals

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Abstract:The quality and mechanical properties of titanium alloy fabricated using selective laser melting (SLM) are critical to the adoption of the process which has long been impeded by the lack of uniformity in SLM-fabrication parameter optimization. In order to address this problem, laser power and scanning speed were combined into linear energy density as an independent variable, while surface morphology was defined as a metric. Based on full-factor experiments, the surface quality of SLM-fabricated titanium alloy was classified into five zones: severe over-melting zone, high-energy density nodulizing zone, smooth forming zone, low-energy density nodulizing zone, and sintering zone. The mechanism resulting in the creation of each zone was analyzed. Parameter uniformity was achieved by establishing a parameter window for each zone, and it also revealed that under smooth forming conditions, the relationship of linear energy density to the quality of the formed surface is not linear. It was also found that fabrication efficiency could be improved in the condition of the formation of a smooth surface by increasing laser power and scanning speed. In addition, maximum elongation of the SLM-fabricated titanium alloy increased when the densified parts were processed using an appropriate heat treatment, from a low value of 5.79% to 10.28%. The mechanisms of change in ductility of the alloy were thoroughly analyzed from the perspectives of surface microstructure and fracture morphology. Results indicate that after heat treatment, the microcosmic structure of the alloy was converted from acicular martensite α' phase to a layered α+β double-phase structure, the fracture type also changed from quasi-cleavage to ductile fracture.

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“…The manufacturing technologies are highly efficient for the fabrication of complex-shaped components. However, the application of metal components so produced is considerably limited by the strong anisotropy of the mechanical properties known to be profoundly affected by material microstructure [1]. The objective of the present article is to develop a two-dimensional (2D) numerical model for a robust description of the formation and evolution of the grain structure during laser-based additive manufacturing of steel products.…”

Section: Introductionmentioning

confidence: 99%

On the numerical simulation of the microstructural evolution induced by laser additive manufacturing of steel products

Zinoviev

Zinovieva

Ploshikhin

et al. 2016

AIP Conference Proceedings

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Laser powder bed fusion additive manufacturing of metals; physics, computational, and materials challenges Applied Physics Reviews 2, 041304 (2015) Abstract. A numerical model is developed to simulate the microstructural evolution during a laser additive manufacturing process. The model is based on original algorithms designed with the use of a modified cellular automata method proposed by Rappaz and Gandin to describe the formation of grain structure during solidification, together with the classical numerical finite difference solution of a heat transfer equation. A double ellipsoid heat source model is employed to calculate the heat input during laser additive manufacturing. The model is validated using experimental data.

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Laser Additive Manufacturing of High-Performance Materials

Cited by 184 publications

References 0 publications

Selective Laser Melting of Magnesium and Magnesium Alloy Powders: A Review

Selective Laser Melting of Magnesium and Magnesium Alloy Powders: A Review

Research on Selective Laser Melting of Ti6Al4V: Surface Morphologies, Optimized Processing Zone, and Ductility Improvement Mechanism

On the numerical simulation of the microstructural evolution induced by laser additive manufacturing of steel products

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