Anisotropic Mechanical Behavior of Additive Manufactured AISI 316L Steel

Yong Deok Im, Kyung Hoon Kim, Kyung Hwan Jung, Young-Kook Lee, Kuk Hyun Song

Research output: Contribution to journalArticle

2 Citations (Scopus)

Abstract

We investigated the relationship between the microstructure and mechanical properties of additive manufactured AISI 316L steel regarding the grain aspect ratio and orientation. For this purpose, two types of specimen (vertically and horizontally built) were prepared by a selective laser melting process, and the mechanical behavior was evaluated in different tensile directions. After this, to observe the characteristic grain boundary distributions such as grain size, shape, orientation, and intergranular misorientation, electron backscattering diffraction analysis was conducted on the initial and tensile-strained specimens. The specimen with a lower grain aspect ratio showed enhanced yield and tensile strengths arising from the higher strain hardening rate relative to the specimen with higher grain aspect ratio. In addition, the material composed of grains with a higher Taylor factor showed more accumulated dislocation density during tensile deformation when compared to the material composed of grains with a lower Taylor factor, which also contributed to the increase in tensile strengths because of the enhanced strain hardening rate.

Original languageEnglish
Pages (from-to)2014-2021
Number of pages8
JournalMetallurgical and Materials Transactions A: Physical Metallurgy and Materials Science
Volume50
Issue number4
DOIs
Publication statusPublished - 2019 Apr 15

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Steel
steels
aspect ratio
Aspect ratio
strain hardening
Strain hardening
tensile strength
Tensile strength
tensile deformation
Backscattering
yield strength
misalignment
Yield stress
backscattering
Grain boundaries
Melting
grain boundaries
Diffraction
grain size
melting

All Science Journal Classification (ASJC) codes

  • Condensed Matter Physics
  • Mechanics of Materials
  • Metals and Alloys

Cite this

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abstract = "We investigated the relationship between the microstructure and mechanical properties of additive manufactured AISI 316L steel regarding the grain aspect ratio and orientation. For this purpose, two types of specimen (vertically and horizontally built) were prepared by a selective laser melting process, and the mechanical behavior was evaluated in different tensile directions. After this, to observe the characteristic grain boundary distributions such as grain size, shape, orientation, and intergranular misorientation, electron backscattering diffraction analysis was conducted on the initial and tensile-strained specimens. The specimen with a lower grain aspect ratio showed enhanced yield and tensile strengths arising from the higher strain hardening rate relative to the specimen with higher grain aspect ratio. In addition, the material composed of grains with a higher Taylor factor showed more accumulated dislocation density during tensile deformation when compared to the material composed of grains with a lower Taylor factor, which also contributed to the increase in tensile strengths because of the enhanced strain hardening rate.",
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Anisotropic Mechanical Behavior of Additive Manufactured AISI 316L Steel. / Im, Yong Deok; Kim, Kyung Hoon; Jung, Kyung Hwan; Lee, Young-Kook; Song, Kuk Hyun.

In: Metallurgical and Materials Transactions A: Physical Metallurgy and Materials Science, Vol. 50, No. 4, 15.04.2019, p. 2014-2021.

Research output: Contribution to journalArticle

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