Recrystallization kinetics, mechanisms, and topology in alloys processed by laser powder-bed fusion: AISI 316L stainless steel as example (2021)
- Authors:
- Autor USP: SANDIM, HUGO RICARDO ZSCHOMMLER - EEL
- Unidade: EEL
- DOI: 10.1016/j.mtla.2021.101236
- Subjects: RECRISTALIZAÇÃO; MATERIAIS
- Keywords: Recrystallization; Non-uniform microstructure; Microstructural path method; Additive manufacturing; Laser powder-bed fusion
- Agências de fomento:
- Language: Inglês
- Abstract: Alloys manufactured by laser powder-bed fusion have intrinsic and hierarchical microstructural features inherited from the fast solidification (up to 104 K/s) and subsequent thermal cycles. This creates epitaxed grains, dislocation cell structures, and second-phase oxide nanoparticles. Epitaxed grains follow a pattern where finer grains are found in the melt pool centerline along the laser track. Upon further annealing, this characteristic microstructure has pronounced consequences on the recrystallization mechanisms and thus on grain topology. By changing the scanning strategy, we control the emerging grain patterns in a representative alloy (AISI 316L austenitic stainless steel) by creating linear strings for unidirectional scans, while a chessboard grain pattern arises by applying a 90°-rotation between layers. Upon post-processing annealing (at 1150 °C from 15 min to 8 h), we study the relationship between the as-built and recrystallized microstructures. Recrystallization starts with fine nuclei in regions with high dislocation density along the melt pool centerlines, resulting in early-stage linear impingement (linearly clustered nucleation), as revealed by microstructural path analysis. Recrystallization is sluggish, due to dynamic Zener-Smith pinning. This effect leads to jerky boundary motion due to periodic pinning and depinning from oxide particles, caused by their gradual coarsening. Lower nuclei number density slows kinetics for the case of unidirectional scanning, while twinning aids in the nucleation of grains with mobile grain boundaries. Our findings show that changes in the laser scanning strategy are a suitable design tool for tailoring recrystallization and thus microstructure.
- Imprenta:
- Source:
- Título: Materialia
- ISSN: 2589-1529
- Volume/Número/Paginação/Ano: v.20, p.1-14, 2021
- Este periódico é de assinatura
- Este artigo NÃO é de acesso aberto
- Cor do Acesso Aberto: closed
-
ABNT
AOTA, Leonardo Shoji et al. Recrystallization kinetics, mechanisms, and topology in alloys processed by laser powder-bed fusion: AISI 316L stainless steel as example. Materialia, v. 20, p. 1-14, 2021Tradução . . Disponível em: https://doi.org/10.1016/j.mtla.2021.101236. Acesso em: 28 dez. 2025. -
APA
Aota, L. S., Bajaj, P., Zilnyk, K. D., Jaegle, E. A., Ponge, D., Sandim, H. R. Z., & Raabe, A. (2021). Recrystallization kinetics, mechanisms, and topology in alloys processed by laser powder-bed fusion: AISI 316L stainless steel as example. Materialia, 20, 1-14. doi:10.1016/j.mtla.2021.101236 -
NLM
Aota LS, Bajaj P, Zilnyk KD, Jaegle EA, Ponge D, Sandim HRZ, Raabe A. Recrystallization kinetics, mechanisms, and topology in alloys processed by laser powder-bed fusion: AISI 316L stainless steel as example [Internet]. Materialia. 2021 ;20 1-14.[citado 2025 dez. 28 ] Available from: https://doi.org/10.1016/j.mtla.2021.101236 -
Vancouver
Aota LS, Bajaj P, Zilnyk KD, Jaegle EA, Ponge D, Sandim HRZ, Raabe A. Recrystallization kinetics, mechanisms, and topology in alloys processed by laser powder-bed fusion: AISI 316L stainless steel as example [Internet]. Materialia. 2021 ;20 1-14.[citado 2025 dez. 28 ] Available from: https://doi.org/10.1016/j.mtla.2021.101236 - Preparação de ligas 'NB'-'TI''O IND.2' por metalurgia do pó e sua caracterização microestrutural
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Informações sobre o DOI: 10.1016/j.mtla.2021.101236 (Fonte: oaDOI API)
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