Flow behavior of magnetic steel powder

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نوع التسجيلة:
Electronic Resource
الدخول الالكتروني :
http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-311804
Particulate Science and Technology, 0272-6351, 2022, 40:5, s. 576-588

معلومة اضافية
- Publisher Information:
  KTH, Processer Informa UK Limited 2022
- Added Details:
  Hulme-Smith, Christopher
- نبذة مختصرة :
  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.
  QC 20220504
- الموضوع:
  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; Metallurgy and Metallic Materials; Metallurgi och metalliska material; Manufacturing, Surface and Joining Technology; Bearbetnings-, yt- och fogningsteknik; Article in journal; info:eu-repo/semantics/article; text
- الرقم المعرف:
  10.1080.02726351.2021.1977442
- Note:
  application/pdf
  English
- Other Numbers:
  UPE oai:DiVA.org:kth-311804
  0000-0002-6339-4612
  doi:10.1080/02726351.2021.1977442
  ISI:000700782900001
  Scopus 2-s2.0-85115734056
  1399552534
- Contributing Source:
  UPPSALA UNIV LIBR
  From OAIster®, provided by the OCLC Cooperative.
- الرقم المعرف:
  edsoai.on1399552534

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