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Flow behavior of magnetic steel powder
KTH, School of Industrial Engineering and Management (ITM), Materials Science and Engineering, Process.ORCID iD: 0000-0002-6339-4612
2022 (English)In: Particulate Science and Technology, ISSN 0272-6351, E-ISSN 1548-0046, Vol. 40, no 5, p. 576-588Article in journal (Refereed) Published
Abstract [en]

Flow occurs in most powder-based processes, opposed by various cohesive forces. Magnetism is often overlooked for metal powders. Here, flowability and magnetization were measured for a dual-phase steel powder in size fractions from (Formula presented.) to > 200 µm. The finest fraction did not flow through a Hall flowmeter, then flow time increased continuously with particle size from 12 ± 1 s for the next fraction ((Formula presented.)) to > 28 ± 0.5 s for > 200 µm. Drying had little effect. Key metrics derived from shear tests gave no overall relationship between flow behavior and particle size. Magnetism was considered the most likely reason for this behavior. Magnetometry showed a remanent magnetization of (Formula presented.) which causes ∼ 5 µN cohesion between 200 µm diameter particles. X-ray diffractometry showed that the powder contained 77 wt%-80 wt% of (magnetic) martensite. Liquid bridging, van der Waals forces and friction (in the Hall flowmeter geometry) contribute 50 µN, 0.08 µN and 4 µN, respectively, to cohesion in 200 µm particles. These results can be used to help explain flow behavior in other magnetic powders and allow optimization of powders and/or powder-based processes. 

Place, publisher, year, edition, pages
Informa UK Limited , 2022. Vol. 40, no 5, p. 576-588
Keywords [en]
flowability, magnetism, Powder metallurgy, spreadability, Compressive strength, Flow measurement, Flowmeters, Magnetization, Powder metals, Shear flow, Van der Waals forces, X ray diffraction analysis, Cohesive force, Dual-phases steels, Flow behaviours, Magnetic steel, Particles sizes, Powder-based, Steel powder, Particle size
National Category
Metallurgy and Metallic Materials Manufacturing, Surface and Joining Technology
Identifiers
URN: urn:nbn:se:kth:diva-311804DOI: 10.1080/02726351.2021.1977442ISI: 000700782900001Scopus ID: 2-s2.0-85115734056OAI: oai:DiVA.org:kth-311804DiVA, id: diva2:1655857
Note

QC 20220504

Available from: 2022-05-04 Created: 2022-05-04 Last updated: 2023-06-08Bibliographically approved

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Hulme-Smith, Christopher

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CiteExportLink to record
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Citation style
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