Numerical modelling of SS316L powder flowability for laser powder-bed fusion

• Autorzy: Bouabbou A. , Vaudreuil S.

Identyfikatory

DOI

10.5604/01.3001.0053.6014

• Języki publikacji: EN

Abstrakty

EN

Purpose: This work aims to improve the powder-bed spreading process for laser powder bed fusion additive manufacturing by gaining a greater understanding of metal powder flowability through numerical modelling and in-situ experimentation. Design/methodology/approach: Using the Discrete Element Method (DEM) to study the flowability of the powder and its intrinsic properties. A high-fidelity particle-scale model was developed to capture the dynamics of metal particle interactions in a virtual Hall flow meter based on a modified Beverloo law. The results are validated experimentally using the Hall flow static powder characterisation technique. Findings: For SS316L powder alloy with the hall-value of 29s/50g and with an angle of repose (AOR) of 32°, the modelled powder that exhibited the same flow behaviour was found using 0.5 for both rolling and sliding coefficients resulting in simulated Hall value of 28.55s/50g with a simulated flow rate of 0.571 g/s, which is validated by AOR of the simulated powder [31.2°- 32.6°]. However, rolling friction had minimal effect on the mass flow rate but increased the angle of repose. Sliding friction significantly decreased the mass flow rate and increased AOR. Research limitations/implications: DEM is an ideal method to study flowability. However, there are certain constraints imposed on the computational power by a number of simulated particles and simulation time-step. Future research may involve investigating other dynamic flowability characterisation techniques. Practical implications: Enabling a better understanding of powder particle flow at a micro-scale by modelling powder flowability. This leads to simulating a more realistic powder bed and improving the powder spreading process, leading to better AM parts quality. Originality/value: This paper provides a unique approach for modelling the flowability of SS316L powder using a Beverloo law-based design of the Hall flow meter. This will improve the modelling of the spreading process needed for metal 3D printing.

Słowa kluczowe

EN

discrete element method; flowability; hall; flow; metal powder; SS316L; LIGGGHTS

PL

metoda elementów dyskretnych; płynność; przepływ; hala; proszek metalowy; SS316L; LIGGHTS

• Wydawca: International OCSCO World Press
• Czasopismo: Archives of Materials Science and Engineering
• Rocznik: 2023
• Tom: Vol. 120, nr 1
• Strony: 22--29
• Opis fizyczny: Bibliogr. 14 poz.

Twórcy

autor

Bouabbou A.

• Euro-Mediterranean University of Fez, Euromed Polytechnic School (EPS), Fès, Morocco

• https://orcid.org/0000-0001-8606-5507

autor

Vaudreuil S.

• Euro-Mediterranean University of Fez, Euromed Polytechnic School (EPS), Fès, Morocco

Bibliografia

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