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Grain refinement in laser powder bed fusion: The influence of dynamic recrystallization and recovery

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Grain refinement in laser powder bed fusion : The influence of dynamic recrystallization and recovery. / Sabzi, Hossein Eskandari; Aboulkhair, Nesma T.; Liang, Xingzhong; Li, Xiao Hui; Simonelli, Marco; Fu, Hanwei; Rivera-Díaz-del-Castillo, Pedro E.J.

In: Materials and Design, Vol. 196, 109181, 30.11.2020.

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Sabzi, Hossein Eskandari ; Aboulkhair, Nesma T. ; Liang, Xingzhong ; Li, Xiao Hui ; Simonelli, Marco ; Fu, Hanwei ; Rivera-Díaz-del-Castillo, Pedro E.J. / Grain refinement in laser powder bed fusion : The influence of dynamic recrystallization and recovery. In: Materials and Design. 2020 ; Vol. 196.

Bibtex

@article{571a2f37d8fb4306a51edfa097d92a26,
title = "Grain refinement in laser powder bed fusion: The influence of dynamic recrystallization and recovery",
abstract = "During laser powder bed fusion (LPBF) the powder bed undergoes several thermal cycles incorporating complex thermo-mechanical processing. Different restoration mechanisms such as dynamic recovery, dynamic recrystallization and grain growth can be activated at different thermal cycles, leading to a very fine average grain size. This is modelled via classical and thermostatistical approaches for an austenitic stainless steel. Four subsequent thermal cycles in each layer induce various microstructural transitions for each individual grain. The high cooling rate solidification in the first two thermal cycles leads to the formation of a highly deformed cellular microstructure. Discontinuous and continuous dynamic recrystallization are activated in the third thermal cycle to induce grain refinement. The fourth thermal cycle undergoes dynamic recovery and grain growth. The as-built alloys exhibit an excellent combination of high yield and ultimate tensile strength. The high strength is attributed to the activation of the various dynamic recrystallization mechanisms, as well as to the development of the cellular structures resulting from a high cooling rate upon solidification. A methodology to design alloys with tailored microstructures is presented.",
keywords = "316L stainless steel, Additive manufacturing, Laser powder bed fusion, Microstructure, Recrystallization",
author = "Sabzi, {Hossein Eskandari} and Aboulkhair, {Nesma T.} and Xingzhong Liang and Li, {Xiao Hui} and Marco Simonelli and Hanwei Fu and Rivera-D{\'i}az-del-Castillo, {Pedro E.J.}",
year = "2020",
month = nov,
day = "30",
doi = "10.1016/j.matdes.2020.109181",
language = "English",
volume = "196",
journal = "Mater. Des.",
issn = "0264-1275",
publisher = "Elsevier Ltd",

}

RIS

TY - JOUR

T1 - Grain refinement in laser powder bed fusion

T2 - The influence of dynamic recrystallization and recovery

AU - Sabzi, Hossein Eskandari

AU - Aboulkhair, Nesma T.

AU - Liang, Xingzhong

AU - Li, Xiao Hui

AU - Simonelli, Marco

AU - Fu, Hanwei

AU - Rivera-Díaz-del-Castillo, Pedro E.J.

PY - 2020/11/30

Y1 - 2020/11/30

N2 - During laser powder bed fusion (LPBF) the powder bed undergoes several thermal cycles incorporating complex thermo-mechanical processing. Different restoration mechanisms such as dynamic recovery, dynamic recrystallization and grain growth can be activated at different thermal cycles, leading to a very fine average grain size. This is modelled via classical and thermostatistical approaches for an austenitic stainless steel. Four subsequent thermal cycles in each layer induce various microstructural transitions for each individual grain. The high cooling rate solidification in the first two thermal cycles leads to the formation of a highly deformed cellular microstructure. Discontinuous and continuous dynamic recrystallization are activated in the third thermal cycle to induce grain refinement. The fourth thermal cycle undergoes dynamic recovery and grain growth. The as-built alloys exhibit an excellent combination of high yield and ultimate tensile strength. The high strength is attributed to the activation of the various dynamic recrystallization mechanisms, as well as to the development of the cellular structures resulting from a high cooling rate upon solidification. A methodology to design alloys with tailored microstructures is presented.

AB - During laser powder bed fusion (LPBF) the powder bed undergoes several thermal cycles incorporating complex thermo-mechanical processing. Different restoration mechanisms such as dynamic recovery, dynamic recrystallization and grain growth can be activated at different thermal cycles, leading to a very fine average grain size. This is modelled via classical and thermostatistical approaches for an austenitic stainless steel. Four subsequent thermal cycles in each layer induce various microstructural transitions for each individual grain. The high cooling rate solidification in the first two thermal cycles leads to the formation of a highly deformed cellular microstructure. Discontinuous and continuous dynamic recrystallization are activated in the third thermal cycle to induce grain refinement. The fourth thermal cycle undergoes dynamic recovery and grain growth. The as-built alloys exhibit an excellent combination of high yield and ultimate tensile strength. The high strength is attributed to the activation of the various dynamic recrystallization mechanisms, as well as to the development of the cellular structures resulting from a high cooling rate upon solidification. A methodology to design alloys with tailored microstructures is presented.

KW - 316L stainless steel

KW - Additive manufacturing

KW - Laser powder bed fusion

KW - Microstructure

KW - Recrystallization

U2 - 10.1016/j.matdes.2020.109181

DO - 10.1016/j.matdes.2020.109181

M3 - Journal article

AN - SCOPUS:85091804973

VL - 196

JO - Mater. Des.

JF - Mater. Des.

SN - 0264-1275

M1 - 109181

ER -