Artigo de periodico

Defects in parts manufactured by selective laser melting caused by δ-ferrite in reused 316L steel powder feedstock (2020)

• Authors:
  • Pinto, Filipe Corrêa
  • Souza Filho, Isnaldi Rodrigues de
  • Sandim, Maria Jose Ramos
  • Sandim, Hugo Ricardo Zschommler
• USP affiliated authors: SANDIM, MARIA JOSÉ RAMOS - EEL ; SANDIM, HUGO RICARDO ZSCHOMMLER - EEL ; PINTO, FILIPE CORRÊA - EEL ; SOUZA FILHO, ISNALDI RODRIGUES DE - EEL
• Unidade: EEL
• DOI: 10.1016/j.addma.2019.100979
• Assunto: MATERIAIS
• Keywords: Powder bed fusion; AISI 316L steel; Powder reuse; Ferrite powder particles; Magnetization
• Agências de fomento:
  • https://dgti.abcd.usp.br/agfinanciamento.php
  • Financiamento CNPq
• Language: Inglês
• Abstract: The presence of δ-ferrite in 316L stainless steel powder reused several times contributes to structural defect formation in selective laser melted parts built using the pin support structure. The virgin 316L stainless steel powder is fully austenitic. After several powder reuse cycles, reused powder has a finer particle size and about 6 vol. % of δ-ferrite. Phase change occurs due to the thermal cycles imposed on the particles near the melt pool, via spattering and further interaction of in-flight droplets with the laser beam. Phase transformation changes the magnetic behavior of the powder leading to particle clustering in the powder bed. The uniformity of the powder bed is affected causing defects such as porosity, delamination, warping and lack of fusion. These defects are more prone to occur at the beginning of the building process. The magnetic and non-magnetic fractions of the reused powder were separated from each other using magnetic separation. Powder characterization was performed using scanning electron microscopy, laser scattering particle size analysis, X-ray diffraction, and magnetization measurements. An explanation for the formation of such defects based on the magnetic behavior of δ-ferrite powder particles is proposed. The results suggest that magnetic separation should be used to remove magnetic particles after several reuse cycles.
• Imprenta:
  • Publisher: Elsevier
  • Publisher place: Pensilvania
  • Date published: 2020
• Source:
  • Título: Additive Manufacturing
  • ISSN: 2214-8604
  • Volume/Número/Paginação/Ano: v. 31, p. 1-10, 2020

Informações sobre o DOI: 10.1016/j.addma.2019.100979 (Fonte: oaDOI API)
• Este periódico é de assinatura
• Este artigo NÃO é de acesso aberto
  
• Cor do Acesso Aberto: closed

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• ABNT

  PINTO, Filipe Corrêa et al. Defects in parts manufactured by selective laser melting caused by δ-ferrite in reused 316L steel powder feedstock. Additive Manufacturing, v. 31, p. 1-10, 2020Tradução . . Disponível em: https://doi.org/10.1016/j.addma.2019.100979. Acesso em: 27 dez. 2025.

• APA

  Pinto, F. C., Souza Filho, I. R. de, Sandim, M. J. R., & Sandim, H. R. Z. (2020). Defects in parts manufactured by selective laser melting caused by δ-ferrite in reused 316L steel powder feedstock. Additive Manufacturing, 31, 1-10. doi:10.1016/j.addma.2019.100979

• NLM

  Pinto FC, Souza Filho IR de, Sandim MJR, Sandim HRZ. Defects in parts manufactured by selective laser melting caused by δ-ferrite in reused 316L steel powder feedstock [Internet]. Additive Manufacturing. 2020 ; 31 1-10.[citado 2025 dez. 27 ] Available from: https://doi.org/10.1016/j.addma.2019.100979

• Vancouver

  Pinto FC, Souza Filho IR de, Sandim MJR, Sandim HRZ. Defects in parts manufactured by selective laser melting caused by δ-ferrite in reused 316L steel powder feedstock [Internet]. Additive Manufacturing. 2020 ; 31 1-10.[citado 2025 dez. 27 ] Available from: https://doi.org/10.1016/j.addma.2019.100979

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