Dependence of mechanical properties and microstructure on solidification onset temperature for Al2024–CaB6 alloys processed using laser powder bed fusion

Mair, Philipp; Kaserer, Lukas; Braun, J.; Stajkovic, J.; Klein, Christian; Schimbäck, D.; Perfler, Lukas; Zhuravlev, Evgeny; Keßler, Olaf; Leichtfried, Gerhard

doi:10.1016/j.msea.2021.142552

Cited by 27 publications

(12 citation statements)

References 47 publications

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“…Exactly the same nanoparticle-modified powder batches as in DFSC were used in PBF-LB/M processes. PBF-LB/M results and parameters are given in the references [ 5 , 11 , 12 , 13 ]. Additionally, the two powder variants 7021/TiC and 7021/TiB 2 have been investigated with both methods in this work.…”

Section: Methodsmentioning

confidence: 99%

“…As-build samples have been analysed regarding grain size and crack characteristics by metallographic methods. The metallographic methods are also described in the references [ 5 , 11 , 12 , 13 ]. In these experiments, cracks have been described by different measures, i.e., crack density determined on cross sections by light microscopy [ 5 , 12 ], crack volume determined by X-ray microtomography [ 13 ] and total crack length per area determined on cross sections by light microscopy [ 11 ].…”

Section: Methodsmentioning

confidence: 99%

“…The metallographic methods are also described in the references [ 5 , 11 , 12 , 13 ]. In these experiments, cracks have been described by different measures, i.e., crack density determined on cross sections by light microscopy [ 5 , 12 ], crack volume determined by X-ray microtomography [ 13 ] and total crack length per area determined on cross sections by light microscopy [ 11 ]. To compare these different crack measures, we suggest a crack characteristic value C, which is defined by the ratio of the crack measure with nanoparticles to the maximum crack measure without nanoparticles, equations (1–3).…”

Section: Methodsmentioning

confidence: 99%

“…This relative crack characteristic C can be used to compare different crack measures, different aluminium alloys, different nanoparticles and different PBF-LB/M processes.

for 7075/TiC, 7021/TiC, 7021/TiB 2 data from [ 5 , 12 ] and this work

for 2024/CaB 6 , data from [ 13 ].

for 6061/YSZ, data from [ 11 ].…”

Section: Methodsmentioning

confidence: 99%

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Correlation between Differential Fast Scanning Calorimetry and Additive Manufacturing Results of Aluminium Alloys

et al. 2022

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High-strength aluminium alloy powders modified with different nanoparticles by ball milling (7075/TiC, 2024/CaB6, 6061/YSZ) have been investigated in-situ during rapid solidification by differential fast scanning calorimetry (DFSC). Solidification undercooling has been evaluated and was found to decrease with an increasing number of nanoparticles, as the particles act as nuclei for solidification. Lower solidification undercooling of individual powder particles correlates with less hot cracking and smaller grains in the material produced by powder bed fusion of metals by a laser beam (PBF-LB/M). Quantitatively, solidification undercooling less than about 10–15 K correlates with almost crack-free PBF-LB/M components and grain sizes less than about 3 µm. This correlation shall be used for future purposeful powder material design on small quantities before performing extensive PBF-LB/M studies.

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Section: Methodsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

“…This relative crack characteristic C can be used to compare different crack measures, different aluminium alloys, different nanoparticles and different PBF-LB/M processes.

for 7075/TiC, 7021/TiC, 7021/TiB 2 data from [ 5 , 12 ] and this work

for 2024/CaB 6 , data from [ 13 ].

for 6061/YSZ, data from [ 11 ].…”

Section: Methodsmentioning

confidence: 99%

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Correlation between Differential Fast Scanning Calorimetry and Additive Manufacturing Results of Aluminium Alloys

et al. 2022

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“…The grain refinement leads to parts of superior strength and improved micro hardness. Mair et al (2021), Mair et al (2022) dry coated Al2024 particles with CaB 6 nanoparticles via planetary ball milling and observed an improvement of AM processability of the composite powder system. The composite powder showed lower reflectivity and higher bulk density than the Al2024 feedstock.…”

Section: Aluminum Alloy Feedstock Powdersmentioning

confidence: 97%

Dry powder coating in additive manufacturing

Schmidt

Peukert

2022

Front. Chem. Eng.

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Dry powder coating is used in many industries to tailor the bulk solid characteristics of cohesive powders. Within this paper, the state of the art of dry coating of feedstock materials for powder based additive manufacturing (AM) processes will be reviewed. The focus is on feedstock materials for powder bed fusion AM processes, such as powder bed fusion of polymers with a laser beam and powder bed fusion of metals with lasers or an electron beam. Powders of several microns to several ten microns in size are used and the feedstock’s bulk solid properties, especially the flowability and packing density are of immanent importance in different process steps in particular for powder dosing and spreading of powder layers onto the building area. All these properties can be tuned by dry particle coating. Moreover, possibilities to improve AM processability and to manipulate the resulting microstructure (c.f. grain refinement, dispersion strengthening) by adhering nanoparticles on the powders will be discussed. The effect of dry coating on the obtained powder properties along the whole AM process chain and the resulting part properties is assessed. Moreover, appropriate characterization methods for bulk solid properties of dry-coated AM powders are critically discussed.

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Recent progress on the control strategies of microstructure and mechanical properties of LPBF-printed aluminum alloys

Wang,

Zou

et al. 2024

Int J Adv Manuf Technol

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Dependence of mechanical properties and microstructure on solidification onset temperature for Al2024–CaB6 alloys processed using laser powder bed fusion

Cited by 27 publications

References 47 publications

Correlation between Differential Fast Scanning Calorimetry and Additive Manufacturing Results of Aluminium Alloys

Correlation between Differential Fast Scanning Calorimetry and Additive Manufacturing Results of Aluminium Alloys

Dry powder coating in additive manufacturing

Recent progress on the control strategies of microstructure and mechanical properties of LPBF-printed aluminum alloys

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