Final published version
Licence: CC BY: Creative Commons Attribution 4.0 International License
Research output: Contribution to Journal/Magazine › Journal article › peer-review
Research output: Contribution to Journal/Magazine › Journal article › peer-review
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TY - JOUR
T1 - Deformation twinning-induced dynamic recrystallization during laser powder bed fusion
AU - Sabzi, H.E.
AU - Li, X.-H.
AU - Zhang, C.
AU - Fu, H.
AU - San-Martín, D.
AU - Rivera-Díaz-del-Castillo, P.E.J.
PY - 2022/1/15
Y1 - 2022/1/15
N2 - Nanotwin formation is observed during laser powder bed fusion (LPBF) of austenitic stainless steels fabricated with various process parameters. Transmission electron microscopy was employed to reveal the nature of such twins, which are formed due to the high strain rapid solidification inherent to LPBF. Dynamic recrystallization (DRX) was also activated during LPBF, and induced by the deformation nanotwins. A thermostatistical model is proposed to determine the critical conditions for twinning-induced DRX; the model is validated with the reported experimental results. This modelling approach offers a method to microstructurally engineer austenitic stainless steels for potential applications needing high strength and ductility.
AB - Nanotwin formation is observed during laser powder bed fusion (LPBF) of austenitic stainless steels fabricated with various process parameters. Transmission electron microscopy was employed to reveal the nature of such twins, which are formed due to the high strain rapid solidification inherent to LPBF. Dynamic recrystallization (DRX) was also activated during LPBF, and induced by the deformation nanotwins. A thermostatistical model is proposed to determine the critical conditions for twinning-induced DRX; the model is validated with the reported experimental results. This modelling approach offers a method to microstructurally engineer austenitic stainless steels for potential applications needing high strength and ductility.
KW - Laser powder bed fusion
KW - Austenitic stainless steel
KW - Transmission electron microscopy
KW - Twinning
KW - Dynamic recrystallization
U2 - 10.1016/j.scriptamat.2021.114307
DO - 10.1016/j.scriptamat.2021.114307
M3 - Journal article
VL - 207
JO - Scripta Materialia
JF - Scripta Materialia
SN - 1359-6462
M1 - 114307
ER -