The origin of abnormal grain growth upon thermomechanical processing of laser powder-bed fusion alloys (2021)
- Authors:
- Autor USP: SANDIM, HUGO RICARDO ZSCHOMMLER - EEL
- Unidade: EEL
- DOI: 10.1016/j.mtla.2021.101243
- Assunto: MATERIAIS
- Keywords: Abnormal grain growth; Additive manufacturing; Thermomechanical processing; Shear bands; Oxide nanoparticles
- Agências de fomento:
- Language: Inglês
- Abstract: Parts produced by laser powder-bed fusion (LPBF) show unique microstructures consisting of dislocation structures and an oxide nanoparticle dispersion usually embedded in epitaxially-grown grains. Thermomechanical processing is an alternative to enhance the microstructure of such materials. However, the deformation mechanisms and the resulting microstructures following annealing are not yet well understood, hindering further microstructure control. We apply cold rolling and subsequent annealing in AISI 316L stainless steel processed by LPBF and perform an in-depth microstructural characterization to understand the origin of abnormal growth and how to avoid it. Upon deformation, mechanical twinning occurs. Early plastic instabilities arise due to the fine substructure with high defect density, resulting in profuse shear banding. Such shear bands carry most of the subsequent deformation, reducing the volume fraction of oxide particles along these regions due to enhanced particle dissolution via cracking/fragmentation. Upon annealing, the cold-rolled specimens show abnormal <110> || ND grains nucleating at shear bands. The earlier recrystallization onset and fragmented particle dissolution in shear bands result in a local lower Zener pinning and generate a size advantage for <110> || ND grains. Based on this investigation, abnormal growth may be triggered by shear bands in cold-rolled and annealed LPBF alloys for grain boundary engineering. Our results suggest that avoiding shear banding (and the consequent particle fragmentation) inhibits abnormal grain growth, thus yielding a more uniform and fine-grained microstructure.
- Imprenta:
- Source:
- Título: Materialia
- ISSN: 2589-1529
- Volume/Número/Paginação/Ano: v.20, p.1-16, 2021
- Este periódico é de assinatura
- Este artigo NÃO é de acesso aberto
- Cor do Acesso Aberto: closed
-
ABNT
AOTA, Leonardo Shoji et al. The origin of abnormal grain growth upon thermomechanical processing of laser powder-bed fusion alloys. Materialia, v. 20, p. 1-16, 2021Tradução . . Disponível em: https://doi.org/10.1016/j.mtla.2021.101243. Acesso em: 27 dez. 2025. -
APA
Aota, L. S., Bajaj, P., Zilnyk, K. D., Ponge, D., & Sandim, H. R. Z. (2021). The origin of abnormal grain growth upon thermomechanical processing of laser powder-bed fusion alloys. Materialia, 20, 1-16. doi:10.1016/j.mtla.2021.101243 -
NLM
Aota LS, Bajaj P, Zilnyk KD, Ponge D, Sandim HRZ. The origin of abnormal grain growth upon thermomechanical processing of laser powder-bed fusion alloys [Internet]. Materialia. 2021 ;20 1-16.[citado 2025 dez. 27 ] Available from: https://doi.org/10.1016/j.mtla.2021.101243 -
Vancouver
Aota LS, Bajaj P, Zilnyk KD, Ponge D, Sandim HRZ. The origin of abnormal grain growth upon thermomechanical processing of laser powder-bed fusion alloys [Internet]. Materialia. 2021 ;20 1-16.[citado 2025 dez. 27 ] Available from: https://doi.org/10.1016/j.mtla.2021.101243 - Recrystallization kinetics, mechanisms, and topology in alloys processed by laser powder-bed fusion: AISI 316L stainless steel as example
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Informações sobre o DOI: 10.1016/j.mtla.2021.101243 (Fonte: oaDOI API)
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