Research Status and Development Trend of Laser Additive Manufacturing Technology

Wu, Guoqing; Yingzhou, Hu; Zhu, W. D.; Song, Chenguang; Hongsong, Han

doi:10.1109/icisce.2017.251

Cited by 6 publications

(8 citation statements)

References 6 publications

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“…where 𝜌 𝑚 (g/cm 3 ) is the density of samples and 𝜌 𝑠 (g/cm 3 ) is their theoretical density. To reduce the measurement errors, the density (𝜌 𝑚 ) of each sample was measured three times and the average results were used in the equation.…”

Section: Materials and Applied Printing Parametersmentioning

confidence: 99%

“…Due to the rapid melting and cooling of SLM process [3,[6][7][8], the grains of the as-built The densities of parts processed at different process parameters were identified on DHAUS analytical balance (AX224ZH) by Archimedes drainage method. The relative density (ρ r ) of samples was calculated using the below equation:…”

Section: Heat Treatmentmentioning

confidence: 99%

“…Additive manufacturing (AM), which is absolutely different than the traditional equal material manufacturing and subtractive manufacturing techniques, is a new technology that manufactures parts through a layer-by-layer method [1][2][3][4][5]. Selective laser melting (SLM) is an additive manufacturing technology that selectively melts and solidifies metal powders by laser beams to form parts according to the two-dimensional part contours generated by computer-aided design (CAD).…”

Section: Introductionmentioning

confidence: 99%

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Selective Laser Melting of Pure Ag and 925Ag Alloy and Their Thermal Conductivity

et al. 2022

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Due to the high reflectivity of Ag to infrared lasers, there is little research focused on the manufacturing of Ag and Ag alloys by selective laser melting (SLM) technique. In this paper, the manufacturing characteristics, microstructure, and thermal conductivity of SLMed Ag, 925Ag, and their heat-treated parts were studied. With the suitable processing parameters, Ag and 925Ag samples with relative densities of 91.06% and 96.56%, respectively, were obtained. Due to the existence of non-molten particles inside the samples and local high energy density of the laser during the processing, a large number of irregular pores and micropores were formed in the microstructures. XRD analysis shows that no phase transition occurred in the annealed Ag and solution-treated 925Ag parts, as compared to their as-built conditions. The SLMed Ag exhibited fine equiaxed grains, while both columnar grains and elongated lath grains existed in the SLMed 925Ag parts. The annealed Ag and solution-treated 925Ag exhibited large equiaxed grains. Due to the grain growth that occurred in the microstructure, the thermal conductivity of Ag increased by 11.35% after completing the annealing treatment. However, that of 925Ag decreased by 17.14% after completing the solid solution treatment, due to the precipitation of the strengthening phase at grain boundaries. A comparison of the thermal conductivities of Ag and 925Ag shows that the influence of the materials on the obtained thermal conductivities was more pronounced than that of the porosity.

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Section: Materials and Applied Printing Parametersmentioning

confidence: 99%

Section: Heat Treatmentmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Selective Laser Melting of Pure Ag and 925Ag Alloy and Their Thermal Conductivity

et al. 2022

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“…Three-dimensional printing by the method of computer-aided design stratification can use digital information in the production practice, mainly by the method of one-by-one printing to accelerate production, also known as the increase in material manufacturing (4)(5)(6). This method has the characteristics of distributed manufacturing and digital manufacturing (7); is applicable to small batches, complex shapes, and customized orders tasks (8); and is widely used in industrial manufacturing, aviation, food, sports, and other fields (9,10). 3D printing technology is the epitome of "digital intelligent nature, " which has the advantage of one-time molding.…”

Section: Introductionmentioning

confidence: 99%

“…The NSGA-II algorithm operating SBX operators are adopted to simulate the evolution process of binary crossover operator, individual creation way as shown in type ( 9), a is a random variable, because of the search scope is limited, easy to appear the problem such as local optimum and evolutionary process is not stable. In view of the deficiency of SBX operator, the normal distribution is introduced into the crossover operator SBX, That is 1.481 replaces a to expand the search space, as shown in Equation (10). In order to further enhance the spatial search capability, the discrete recombination operation of evolutionary strategy is introduced into Equation (11).…”

Section: Introducing the Normal Distribution Crossover Operator (Ndx)mentioning

confidence: 99%

Research on the Allocation of 3D Printing Emergency Supplies in Public Health Emergencies

Liu

Thuong

et al. 2021

Front. Public Health

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Significant public health emergencies greatly impact the global supply chain system of production and cause severe shortages in personal protective and medical emergency supplies. Thus, rapid manufacturing, scattered distribution, high design degrees of freedom, and the advantages of the low threshold of 3D printing can play important roles in the production of emergency supplies. In order to better realize the efficient distribution of 3D printing emergency supplies, this paper studies the relationship between supply and demand of 3D printing equipment and emergency supplies produced by 3D printing technology after public health emergencies. First, we fully consider the heterogeneity of user orders, 3D printing equipment resources, and the characteristics of diverse production objectives in the context of the emergent public health environment. The multi-objective optimization model for the production of 3D printing emergency supplies, which was evaluated by multiple manufacturers and in multiple disaster sites, can maximize time and cost benefits of the 3D printing of emergency supplies. Then, an improved non-dominated sorting genetic algorithm (NSGA-II) to solve the multi-objective optimization model is developed and compared with the traditional NSGA-II algorithm analysis. It contains more than one solution in the Pareto optimal solution set. Finally, the effectiveness of 3D printing is verified by numerical simulation, and it is found that it can solve the matching problem of supply and demand of 3D printing emergency supplies in public health emergencies.

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Thermal behavior of materials in laser-assisted extreme manufacturing: Raman-based novel characterization

Wang

Yue

et al. 2020

Int. J. Extrem. Manuf.

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Laser-assisted manufacturing (LAM) is a technique that performs machining of materials using a laser heating process. During the process, temperatures can rise above over 2000 °C. As a result, it is crucial to explore the thermal behavior of materials under such high temperatures to understand the physics behind LAM and provide feedback for manufacturing optimization. Raman spectroscopy, which is widely used for structure characterization, can provide a novel way to measure temperature during LAM. In this review, we discuss the mechanism of Raman-based temperature probing, its calibration, and sources of uncertainty/error, and how to control them. We critically review the Raman-based temperature measurement considering the spatial resolution under near-field optical heating and surface structure-induced asymmetries. As another critical aspect of Raman-based temperature measurement, temporal resolution is also reviewed to cover various ways of realizing ultrafast thermal probing. We conclude with a detailed outlook on Raman-based temperature probing in LAM and issues that need special attention.

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Research Status and Development Trend of Laser Additive Manufacturing Technology

Cited by 6 publications

References 6 publications

Selective Laser Melting of Pure Ag and 925Ag Alloy and Their Thermal Conductivity

Selective Laser Melting of Pure Ag and 925Ag Alloy and Their Thermal Conductivity

Research on the Allocation of 3D Printing Emergency Supplies in Public Health Emergencies

Thermal behavior of materials in laser-assisted extreme manufacturing: Raman-based novel characterization

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