Impact of gas flow direction on the crystallographic texture evolution in laser beam powder bed fusion

Amano, Hiroki; Ishimoto, Takuya; Hagihara, Koji; Suganuma, Ryoya; Aiba, Keisuke; Wang, Pan; Nakano, Takayoshi

doi:10.1080/17452759.2023.2169172

Cited by 9 publications

(2 citation statements)

References 61 publications

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“…The X, Y, and Z axes represent HD, SD, and BD, respectively ( Figure 2(a) ). The Ar gas flow direction is indicated in the applicable figures ( Figures 4–7 ) because it has been demonstrated that the Ar gas flow affected the crystal texture formation [ 32 ] although it is a future work to investigate the effect of the gas flow on the texture formation in this study. Stage heating was not adopted in this study.…”

Section: Methodsmentioning

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: Methodsmentioning

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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“…The laser powder bed fusion additive manufacturing process creates a part by repeatedly melting and solidifying a powder feedstock into some desired geometry. The outcomes of this layer-by-layer process are dependent on the powder feedstock properties [18], system settings such as laser beam properties [19] and gas flow [20], scan path parameters [21,22], laser-material material interactions [19], solidification behavior, defect formation during processing [23], and post-process treatments [24].…”

Section: Simulation Workflowmentioning

confidence: 99%

Assessment of Process Modeling Tools for Determining Variability in Additively Manufactured Parts

Plotkowski¹,

Knapp²,

Coleman³

et al. 2023

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The Advanced Materials and Manufacturing Technologies (AMMT) [1] program aims to accelerate the development, qualification, demonstration, and deployment of advanced materials and manufacturing technologies to enable reliable and economical nuclear energy However, the unique aspects of additive manufacturing (AM) materials in terms of their processing history, microstructure, and properties, are a major barrier for qualification and certification of nuclear components. Much of this challenge may be attributed to component scale variations in microstructure and properties that are driven by local influences of process conditions and geometry on thermal history, melt pool dynamics, and corresponding microstructure evolution. Computational modeling tools may be helpful in this regard to aid in predicting and controlling this level of variability. The purpose of this report is to review the current state-of-the-art for process modeling with regards to metal AM. For this purpose, we consider specifically the case study of laser powder bed fusion (LPBF) processing of SS316, a family of alloys that are both commonly used in nuclear energy applications and suitable for AM processing. The report first introduces the necessary components of a process modeling workflow, followed by a review of the current status of each. At the end, application of these modeling tools to understanding variability in AM process given their current state are considered, and recommendations for future development are proposed.

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Grain structure and texture selection regimes in metal powder bed fusion

Rolchigo,

Coleman,

Knapp

et al. 2024

Additive Manufacturing

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Impact of gas flow direction on the crystallographic texture evolution in laser beam powder bed fusion

Cited by 9 publications

References 61 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

Assessment of Process Modeling Tools for Determining Variability in Additively Manufactured Parts

Grain structure and texture selection regimes in metal powder bed fusion

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