scholarly journals Classification of specimen density in Laser Powder Bed Fusion (L-PBF) using in-process structure-borne acoustic process emissions

2020 ◽  
Vol 34 ◽  
pp. 101324
Author(s):  
N. Eschner ◽  
L. Weiser ◽  
B. Häfner ◽  
G. Lanza
Keyword(s):  
Powder Bed Fusion ◽  
Laser Powder Bed Fusion ◽  
Powder Bed ◽  
Specimen Density ◽  
Process Structure

Laser Powder Bed Fusion in-situ alloying of Ti-5%Cu alloy: Process-structure relationships

2020 ◽  
pp. 157558
Author(s):  
M.H. Mosallanejad ◽  
B. Niroumand ◽  
A. Aversa ◽  
D. Manfredi ◽  
A. Saboori
Keyword(s):  
Powder Bed Fusion ◽  
Laser Powder Bed Fusion ◽  
Powder Bed ◽  
Cu Alloy ◽  
Alloy Process ◽  
Process Structure

scholarly journals Process–Structure–Property Relationships of Copper Parts Manufactured by Laser Powder Bed Fusion

Materials ◽  
2021 ◽  
Vol 14 (11) ◽  
pp. 2945
Author(s):  
Mohamed Abdelhafiz ◽  
Kassim S. Al-Rubaie ◽  
Ali Emadi ◽  
Mohamed A. Elbestawi
Keyword(s):  
Laser Power ◽  
Scanning Speed ◽  
Powder Bed Fusion ◽  
Structure Property ◽  
Laser Powder Bed Fusion ◽  
Powder Bed ◽  
X Ray ◽  
Structure Property Relationships ◽  
Process Structure ◽  
Hatch Spacing

The process–structure–property relationships of copper laser powder bed fusion (L-PBF)-produced parts made of high purity copper powder (99.9 wt %) are examined in this work. A nominal laser beam diameter of 100 μm with a continuous wavelength of 1080 nm was employed. A wide range of process parameters was considered in this study, including five levels of laser power in the range of 200 to 370 W, nine levels of scanning speed from 200 to 700 mm/s, six levels of hatch spacing from 50 to 150 μm, and two layer thickness values of 30 μm and 40 μm. The influence of preheating was also investigated. A maximum relative density of 96% was obtained at a laser power of 370 W, scanning speed of 500 mm/s, and hatch spacing of 100 μm. The results illustrated the significant influence of some parameters such as laser power and hatch spacing on the part quality. In addition, surface integrity was evaluated by surface roughness measurements, where the optimum Ra was measured at 8 μm ± 0.5 μm. X-ray photoelectron spectroscopy (XPS) and energy-dispersive X-ray spectroscopy (EDX) were performed on the as-built samples to assess the impact of impurities on the L-PBF part characteristics. The highest electrical conductivity recorded for the optimum density-low contaminated coils was 81% IACS.

scholarly journals Process-structure-property relationships in laser powder bed fusion of permanent magnetic Nd-Fe-B

2021 ◽  
pp. 109992
Author(s):  
Julan Wu ◽  
Nesma T. Aboulkhair ◽  
Michele Degano ◽  
Ian Ashcroft ◽  
Richard J.M. Hague
Keyword(s):  
Powder Bed Fusion ◽  
Structure Property ◽  
Laser Powder Bed Fusion ◽  
Powder Bed ◽  
Structure Property Relationships ◽  
Process Structure

scholarly journals Knowledge of process-structure-property relationships to engineer better heat treatments for laser powder bed fusion additive manufactured Inconel 718

2020 ◽  
Vol 31 ◽  
pp. 100977 ◽  
Author(s):  
Thomas G. Gallmeyer ◽  
Senthamilaruvi Moorthy ◽  
Branden B. Kappes ◽  
Michael J. Mills ◽  
Behnam Amin-Ahmadi ◽  
...  
Keyword(s):  
Inconel 718 ◽  
Heat Treatments ◽  
Powder Bed Fusion ◽  
Structure Property ◽  
Laser Powder Bed Fusion ◽  
Powder Bed ◽  
Structure Property Relationships ◽  
Process Structure

Near-Threshold Fatigue Crack Growth Rates of Laser Powder Bed Fusion Produced Ti-6Al-4V

2020 ◽  
Author(s):  
Thorsten Hermann Becker ◽  
Nur Mohamed Dhansay ◽  
Gerrit Matthys Ter Haar ◽  
Kim Vanmeensel
Keyword(s):  
Fatigue Crack ◽  
Fatigue Crack Growth ◽  
Crack Growth ◽  
Growth Rates ◽  
Powder Bed Fusion ◽  
Laser Powder Bed Fusion ◽  
Powder Bed ◽  
Crack Growth Rates ◽  
Near Threshold

scholarly journals On the Relevance of Volumetric Energy Density in the Investigation of Inconel 718 Laser Powder Bed Fusion

Materials ◽  
2020 ◽  
Vol 13 (3) ◽  
pp. 538 ◽  
Author(s):  
Fabrizia Caiazzo ◽  
Vittorio Alfieri ◽  
Giuseppe Casalino
Keyword(s):  
Surface Roughness ◽  
Energy Density ◽  
Process Parameters ◽  
Vickers Hardness ◽  
Powder Bed Fusion ◽  
Processing Conditions ◽  
Laser Powder Bed Fusion ◽  
Powder Bed ◽  
Fractional Density ◽  
Experimental Variation

Laser powder bed fusion (LPBF) can fabricate products with tailored mechanical and surface properties. In fact, surface texture, roughness, pore size, the resulting fractional density, and microhardness highly depend on the processing conditions, which are very difficult to deal with. Therefore, this paper aims at investigating the relevance of the volumetric energy density (VED) that is a concise index of some governing factors with a potential operational use. This paper proves the fact that the observed experimental variation in the surface roughness, number and size of pores, the fractional density, and Vickers hardness can be explained in terms of VED that can help the investigator in dealing with several process parameters at once.

Heat source model calibration for thermal analysis of laser powder-bed fusion

2020 ◽  
Vol 106 (7-8) ◽  
pp. 3367-3379 ◽  
Author(s):  
Shahriar Imani Shahabad ◽  
Zhidong Zhang ◽  
Ali Keshavarzkermani ◽  
Usman Ali ◽  
Yahya Mahmoodkhani ◽  
...  
Keyword(s):  
Thermal Analysis ◽  
Heat Source ◽  
Model Calibration ◽  
Source Model ◽  
Powder Bed Fusion ◽  
Laser Powder Bed Fusion ◽  
Heat Source Model ◽  
Powder Bed
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