Influence of hatch spacing on heat and mass transfer, thermodynamics and laser processability during additive manufacturing of Inconel 718 alloy

Xia, Mujian; Gu, Dongdong; Yu, Guangying; Dai, Donghua; Chen, Hongyu; Shi, Qimin

doi:10.1016/j.ijmachtools.2016.07.010

Cited by 172 publications

(40 citation statements)

References 27 publications

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“…A function of heat and mass transfer may be found [2,13], based on the main processing parameters such as the size of the laser beam, the laser power, the scanning speed, the layer thickness, and the hatch spacing [14,15]. Therefore, extensive research has been conducted to draw a correlation between densification and microstructure of IN178 and IN625 AMmade parts.…”

Section: Introductionmentioning

confidence: 99%

Laser powder-bed fusion of Inconel 718 to manufacture turbine blades

Caiazzo

Alfieri

Corrado

et al. 2017

Int J Adv Manuf Technol

108

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In the frame of additive manufacturing of metals, laser powder-bed fusion is investigated in this paper as an advanced industrial prototyping tool to manufacture Inconel 718 turbine blades at a predesign stage before flow production. Expediting of the evaluation of any upgrade to the part is aimed. To this purpose, possible anisotropy of manufacturing is preliminarily investigated via tensile testing at room and elevated temperature as a function of the sloping angle with the building plate; the normalized strength is given and compared with similar studies in the literature. Positioning and proper supporting in manufacturing are discussed; the parts are further investigated to assess their compliance with the intended nominal geometry.

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Section: Introductionmentioning

confidence: 99%

Laser powder-bed fusion of Inconel 718 to manufacture turbine blades

Caiazzo

Alfieri

Corrado

et al. 2017

Int J Adv Manuf Technol

108

View full text Add to dashboard Cite

show abstract

“…Methods to minimise porosity include determining the best combination of laser power, layer thickness, scan speed (the speed at which the laser spot moves over a certain surface area over time) and hatch spacing (the distance between the centres of two adjacent laser beam paths). 18,19 Furthermore, issues faced with traditionally manufactured metal frames, such as corrosion and nickel release, also apply to printing with metals. If the challenges of porosity and corrosion can be addressed, applying powder bed fusion techniques with metal powders could be used for manufacturing spectacles.…”

Section: Powder Bed Fusion (Polymers and Metals)mentioning

confidence: 99%

3‐D printed spectacles: potential, challenges and the future

Lee

Burnett

Panos

et al. 2020

Clinical and Experimental Optometry

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Three‐dimensional (3‐D) printing offers the potential to custom‐produce a wide range of manufactured objects and improve manufacturing processes. The additive manufacturing process involves material (resin, metal, ceramics or biological cells) being deposited layer upon layer, which is fused to create a 3‐D object. While 3‐D printing has been readily available in the aerospace and automotive industries, and is being used increasingly in the medical field, its potential for optometry and ophthalmic optics has rarely been discussed in depth. 3‐D printing of spectacles has the potential to provide customised experiences, to cater for those who do not fit standardised frames or for those with irregular prescriptions, and to reduce delivery times and inventory with the opportunity of increasing access to underserved populations. Here we review available 3‐D printing technologies, and the current 3‐D printed spectacle market, including testing three commercially available spectacle frames to assess compliance with ISO:12870 standards. The article then explores the challenges faced and environmental impact of implementing 3‐D printing of spectacles.

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“…Other useful studies that varied the processing parameters to control residual stresses include those by Tolosa et al [84], Brandl et al [85], Edwards and Ramulu [86], Guan et al [87] Yadroitsev and Smurov [88], Yadroitsev et al [89], Cheng et al [90], Xia et al [91], Lu et al [92] and Yu et al [93]. …”

Section: Process Input Controlmentioning

confidence: 99%

Overhanging Features and the SLM/DMLS Residual Stresses Problem: Review and Future Research Need

2017

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Abstract:A useful and increasingly common additive manufacturing (AM) process is the selective laser melting (SLM) or direct metal laser sintering (DMLS) process. SLM/DMLS can produce full-density metal parts from difficult materials, but it tends to suffer from severe residual stresses introduced during processing. This limits the usefulness and applicability of the process, particularly in the fabrication of parts with delicate overhanging and protruding features. The purpose of this study was to examine the current insight and progress made toward understanding and eliminating the problem in overhanging and protruding structures. To accomplish this, a survey of the literature was undertaken, focusing on process modeling (general, heat transfer, stress and distortion and material models), direct process control (input and environmental control, hardware-in-the-loop monitoring, parameter optimization and post-processing), experiment development (methods for evaluation, optical and mechanical process monitoring, imaging and design-of-experiments), support structure optimization and overhang feature design; approximately 143 published works were examined. The major findings of this study were that a small minority of the literature on SLM/DMLS deals explicitly with the overhanging stress problem, but some fundamental work has been done on the problem. Implications, needs and potential future research directions are discussed in-depth in light of the present review.

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Influence of hatch spacing on heat and mass transfer, thermodynamics and laser processability during additive manufacturing of Inconel 718 alloy

Cited by 172 publications

References 27 publications

Laser powder-bed fusion of Inconel 718 to manufacture turbine blades

Laser powder-bed fusion of Inconel 718 to manufacture turbine blades

3‐D printed spectacles: potential, challenges and the future

Overhanging Features and the SLM/DMLS Residual Stresses Problem: Review and Future Research Need

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