Beam Shaping in Laser Powder Bed Fusion: Péclet Number and Dynamic Simulation

Grigoriev, Sergey N.; Gusarov, A.V.; Metel, Alexander; Tarasova, Tatiana; Волосова, М. А.; Okunkova, Anna A.; Gusev, Andrey

doi:10.3390/met12050722

Cited by 25 publications

(18 citation statements)

References 71 publications

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“…The <001> fcc growth direction relative to the BD in the XZ plane ( Figure 2(b) ) was influenced by the beam profile’s intensity distribution and the laser processing parameters, e.g. laser power or scan speed [ 34 ]. Controlling the <001> fcc growth direction relative to the BD in the XZ plane has been reported to be one of the beneficial aspects of achieving an LPBF-derived SX structure [ 11 ].…”

Section: Resultsmentioning

confidence: 99%

Effect of scan strategy on the formation of a pure nickel single-crystal structure using a flat-top laser beam via laser powder bed fusion

Jodi

Kitashima

Watanabe

2023

Science and Technology of Advanced Materials

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In this study, the role of a scan strategy in the fabrication of a single crystal (SX) structure of face-centered cubic (fcc) pure Ni using a flat-top laser profile by a laser powder bed fusion (LPBF) process was investigated. A flat-top laser with a uniform heat intensity across the beam profile was employed to fabricate the SX structure with a <001> texture parallel to the build direction (║BD). A meander scan strategy with an XY–90° scan rotation was required to achieve the flat-top-derived SX structure. The meander scanning strategy promoted the epitaxial <001> fcc growth along the direction ║BD, leading to the <001>║BD texture formation. Meanwhile, the XY–90° scan rotation induced the epitaxial growth of <001> fcc phase on the hatch direction (HD)–scan direction (SD) plane in the direction deviated by approximately 45° relative to the SD. This 45° deviation relative to the SD occurred to accommodate the beam movement and the circular beam geometry on the HD – SD plane, resulting in the preferred configurations of <011>║SD and HD. Thus, this paper reports the importance of meander scanning with a 90° scan-rotation strategy to yield a flat-top-LPBF-derived SX structure with <001>║BD and <011>║SD and HD textures.

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Section: Resultsmentioning

confidence: 99%

Effect of scan strategy on the formation of a pure nickel single-crystal structure using a flat-top laser beam via laser powder bed fusion

Jodi

Kitashima

Watanabe

2023

Science and Technology of Advanced Materials

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“…Distributing/redistributing energy in the laser beam spot (round and quadratic) in laser additive manufacturing (experimentally and numerically) and surface treatment for various types of metals alloys, such as cast iron and steel [9][10][11][12]; 2.…”

Section: Contributionsmentioning

confidence: 99%

Advances in Laser Materials Processing

Grigoriev

Волосова

Okunkova

2022

Metals

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“…Preliminary tensile improvements of ring laser compared to Gaussian include: UTS 15%, YS 4.6%, Elongation 48%. Grigoriev et al began some initial beam modelling with weld tracks that can simulate the thermal properties of the beam during melt [10]. Grünewald et al [11] investigated the in uence of ring-shaped beam pro les on process stability and productivity in laserbased powder bed fusion of AISI 316L.…”

Section: Introductionmentioning

confidence: 99%

Energy Efficiency influence of Gaussian and Ring-shaped beam profiles for LPBF

Cozzolino,

Tiley,

Ramirez

et al. 2023

Preprint

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Additive Manufacturing (AM) has the potential for improving sustainability of metal processing through decreased energy and materials usage compared to casting and forging. Laser powder bed fusion (LPBF) of high temperature alloys such as nickel alloy 718 is one of the key modalities supporting this effort. One of the major drawbacks to LPBF is its slow build speed on the order of 5–10 cubic centimeters per hour print speed. This experimental study investigates how to increase the productivity of LPBF process by switching from a traditional Gaussian laser shape to a ring laser shape using an nLight multi-modal laser. The objective is to increase productivity, reducing energy consumption and time, without sacrificing mechanical properties by switching to the ring laser thereby improving the sustainability for LPBF. Results include measuring the energy consumption of an Open Additive LPBF system during 718 printing and comparing the microstructure and mechanical properties of the two different lasers.

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Beam Shaping in Laser Powder Bed Fusion: Péclet Number and Dynamic Simulation

Cited by 25 publications

References 71 publications

Effect of scan strategy on the formation of a pure nickel single-crystal structure using a flat-top laser beam via laser powder bed fusion

Effect of scan strategy on the formation of a pure nickel single-crystal structure using a flat-top laser beam via laser powder bed fusion

Advances in Laser Materials Processing

Energy Efficiency influence of Gaussian and Ring-shaped beam profiles for LPBF

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