Effects of ambient pressure on single-pulse laser processing of austenite stainless steel

Su, Jiangzhou; Zhang, Zhijing; Xiao, Muzheng; Ye, Zhipeng; Yang, Yi-Ju

doi:10.1016/j.jmatprotec.2018.07.015

Cited by 14 publications

(6 citation statements)

References 11 publications

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“…38,39 Larger laser irradiance and/or slow scan speed can produce deeper microgrooves and larger sizes of nanoparticles, while lower laser irradiance and/or faster scan speed can produce shallow microgrooves and smaller sizes of nanoparticles. The number of scans on the same line, 60 electric field orientation, 62,63 and ambient environment 64 are other control parameters to control the size and density of nanoparticles, the orientation of nanostructures, 65 and chemical composition. For example, different gas ambient or liquid media can be chosen to change the chemical composition of the laserprocessed surfaces.…”

Section: Femtosecond Direct Laser Processing Of Selective Solar Absorbersmentioning

confidence: 99%

Femtosecond laser‐produced optical absorbers for solar‐thermal energy harvesting

Singh

Chen

2021

EcoMat

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Optical absorbers are a key component in all solar‐thermal energy technologies. Cermet‐based solar absorbers are commonly used in solar‐thermal applications. However, due to their multilayered structures, these absorbers have limited thermal conductivity and mechanical stability at the interfaces. Femtosecond laser processing is a single‐step, environmentally friendly, and monolithic approach that can directly transform a metal surface to a solar absorber through surface patterning without adding additional weight, hazard, or complexity. In this review, we will focus on femtosecond‐laser induced broadband and selective solar absorbers and their utilizations in solar thermoelectric generators and solar‐thermal water purification. We will discuss the laser surface patterning and the procedure to control the size, distribution, and composition of the surface structures that are responsible for optical absorbance/emittance. Several multifunctional solar absorber surfaces produced by femtosecond‐laser processing and their possible energy applications are also discussed.

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Section: Femtosecond Direct Laser Processing Of Selective Solar Absorbersmentioning

confidence: 99%

Femtosecond laser‐produced optical absorbers for solar‐thermal energy harvesting

Singh

Chen

2021

EcoMat

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“…The research results verify the beneficial effects of a gas positive-pressure environment on metal rapid-melting and solidification, such as inhibiting oxidation, eliminating defects, and refining grains. This creates a foundation for realizing additive manufacturing in a gas positive-pressure environment [ 23 ].…”

Section: Introductionmentioning

confidence: 99%

Effect of an Inert Gas Positive-Pressure Environment on Beryllium Melting under a Pulsed Laser

et al. 2022

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: Beryllium is widely used in the manufacturing of precision instruments because of its high thermal and mechanical properties. However, because beryllium is expensive, and processing it generally uses subtractive manufacturing methods, the cost is high, the utilization rate of cutting the materials is low, and the processing is difficult. Additionally, it is extremely prone to cracking, brittle fracturing, and fracturing during the machining process. In this paper, a new method for manufacturing beryllium laser additives under a pressure atmosphere is proposed. Via the single-point and single-pass laser melting of beryllium materials in an inert gas (Ar) pressure atmosphere, the results of the experiments conducted in the pressure range of 1 to 30 bar indicated the following: (1) beryllium can absorb the laser and form a molten pool, and the contour area of the upper surface of the molten pool is approximately 80% of that of 304 stainless steel under the same energy input; (2) severe oxidation occurs on and near the molten pool surface under low pressure, and oxidation is eliminated when the pressure is increased; (3) as ambient pressure increases, the surface profile of the molten pool gradually exhibits an irregular shape, and the cracks on the surface of beryllium change from “divergent” to “shrinkage,” which can eliminate cracking. At higher pressures, the “small hole” phenomenon in the molten pool disappears, forming a wide and shallow molten pool shape that is more conducive to stable deposition. The experimental results indicate that the laser-additive manufacturing of beryllium in a pressure atmosphere is a meaningful developmental direction for beryllium processing in the future.

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“…As a result, less energy is required to maintain the keyhole open and thus a deeper penetration depth can be achieved while equivalent laser radiation is absorbed [6,15]. It has been observed from experimental and simulation results [11,16] that a lower ambient pressure can contribute to expanding the vapor plume and decreasing the temperature of the vapor plasma. Consequently, the absorption and scattering of the laser beam would be suppressed under the sub-atmospheric pressure due to the reduced density and ionization degree of the metal vapor.…”

Section: Introductionmentioning

confidence: 99%

Effects of sub-atmospheric pressure on keyhole dynamics and porosity in products fabricated by selective laser melting

Tan

Kiran

Zhou

2021

Journal of Manufacturing Processes

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Effects of ambient pressure on single-pulse laser processing of austenite stainless steel

Cited by 14 publications

References 11 publications

Femtosecond laser‐produced optical absorbers for solar‐thermal energy harvesting

Femtosecond laser‐produced optical absorbers for solar‐thermal energy harvesting

Effect of an Inert Gas Positive-Pressure Environment on Beryllium Melting under a Pulsed Laser

Effects of sub-atmospheric pressure on keyhole dynamics and porosity in products fabricated by selective laser melting

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