Structural evolution during nanostructuring of additive manufactured 316L stainless steel by high-pressure torsion

Jae Kyung Han; Xiaojing Liu; Isshu Lee; Yulia O. Kuzminova; Stanislav A. Evlashin; Klaus Dieter Liss; Megumi Kawasaki

doi:10.1016/j.matlet.2021.130364

Structural evolution during nanostructuring of additive manufactured 316L stainless steel by high-pressure torsion

Jae Kyung Han, Xiaojing Liu, Isshu Lee, Yulia O. Kuzminova, Stanislav A. Evlashin, Klaus Dieter Liss, Megumi Kawasaki

Research output: Contribution to journal › Article › peer-review

18 Scopus citations

Abstract

This study investigates the structural evolution including crystallite size, micro-strain, and lattice parameters of an additive manufactured 316L stainless steel during post-printing nanostructuring by high-pressure torsion (HPT) at room temperature. Formation of a martensite phase was observed in the nanostructured austenitic steel having an average grain size of 60 nm after 8 HPT turns. Significant strain gradients exist between the close-packed planes and out-of-close-packed-planes in the nanocrystalline structure, while such strain gradient was not observed in the as-built material. Structural changes occur in a very early stage of nanostructuring through 1/2 HPT turn and are attributed to severe lattice distortion by the excess of dislocations and defects.

Original language	English
Article number	130364
Journal	Materials Letters
Volume	302
DOIs	https://doi.org/10.1016/j.matlet.2021.130364
State	Published - Nov 1 2021
Externally published	Yes

Funding

This study was supported by the National Science Foundation of the United States under Grant No. DMR-1810343.

Funders	Funder number
National Science Foundation	DMR-1810343

Keywords

Defects
Microstructure
Nanocrystalline materials
Phase transformation
X-ray techniques

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10.1016/j.matlet.2021.130364

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title = "Structural evolution during nanostructuring of additive manufactured 316L stainless steel by high-pressure torsion",

abstract = "This study investigates the structural evolution including crystallite size, micro-strain, and lattice parameters of an additive manufactured 316L stainless steel during post-printing nanostructuring by high-pressure torsion (HPT) at room temperature. Formation of a martensite phase was observed in the nanostructured austenitic steel having an average grain size of 60 nm after 8 HPT turns. Significant strain gradients exist between the close-packed planes and out-of-close-packed-planes in the nanocrystalline structure, while such strain gradient was not observed in the as-built material. Structural changes occur in a very early stage of nanostructuring through 1/2 HPT turn and are attributed to severe lattice distortion by the excess of dislocations and defects.",

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author = "Han, {Jae Kyung} and Xiaojing Liu and Isshu Lee and Kuzminova, {Yulia O.} and Evlashin, {Stanislav A.} and Liss, {Klaus Dieter} and Megumi Kawasaki",

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T1 - Structural evolution during nanostructuring of additive manufactured 316L stainless steel by high-pressure torsion

AU - Han, Jae Kyung

AU - Liu, Xiaojing

AU - Lee, Isshu

AU - Kuzminova, Yulia O.

AU - Evlashin, Stanislav A.

AU - Liss, Klaus Dieter

AU - Kawasaki, Megumi

PY - 2021/11/1

Y1 - 2021/11/1

N2 - This study investigates the structural evolution including crystallite size, micro-strain, and lattice parameters of an additive manufactured 316L stainless steel during post-printing nanostructuring by high-pressure torsion (HPT) at room temperature. Formation of a martensite phase was observed in the nanostructured austenitic steel having an average grain size of 60 nm after 8 HPT turns. Significant strain gradients exist between the close-packed planes and out-of-close-packed-planes in the nanocrystalline structure, while such strain gradient was not observed in the as-built material. Structural changes occur in a very early stage of nanostructuring through 1/2 HPT turn and are attributed to severe lattice distortion by the excess of dislocations and defects.

AB - This study investigates the structural evolution including crystallite size, micro-strain, and lattice parameters of an additive manufactured 316L stainless steel during post-printing nanostructuring by high-pressure torsion (HPT) at room temperature. Formation of a martensite phase was observed in the nanostructured austenitic steel having an average grain size of 60 nm after 8 HPT turns. Significant strain gradients exist between the close-packed planes and out-of-close-packed-planes in the nanocrystalline structure, while such strain gradient was not observed in the as-built material. Structural changes occur in a very early stage of nanostructuring through 1/2 HPT turn and are attributed to severe lattice distortion by the excess of dislocations and defects.

KW - Defects

KW - Microstructure

KW - Nanocrystalline materials

KW - Phase transformation

KW - X-ray techniques

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VL - 302

JO - Materials Letters

JF - Materials Letters

M1 - 130364

ER -

Structural evolution during nanostructuring of additive manufactured 316L stainless steel by high-pressure torsion

Abstract

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Keywords

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