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 language | English |
|---|---|
| Pages (from-to) | 2014-2021 |
| Number of pages | 8 |
| Journal | Metallurgical and Materials Transactions A: Physical Metallurgy and Materials Science |
| Volume | 50 |
| Issue number | 4 |
| DOIs | |
| Publication status | Published - 2019 Apr 15 |
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All Science Journal Classification (ASJC) codes
- Condensed Matter Physics
- Mechanics of Materials
- Metals and Alloys
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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 journal › Article
TY - JOUR
T1 - Anisotropic Mechanical Behavior of Additive Manufactured AISI 316L Steel
AU - Im, Yong Deok
AU - Kim, Kyung Hoon
AU - Jung, Kyung Hwan
AU - Lee, Young-Kook
AU - Song, Kuk Hyun
PY - 2019/4/15
Y1 - 2019/4/15
N2 - 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.
AB - 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.
UR - http://www.scopus.com/inward/record.url?scp=85061307254&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=85061307254&partnerID=8YFLogxK
U2 - 10.1007/s11661-019-05139-7
DO - 10.1007/s11661-019-05139-7
M3 - Article
AN - SCOPUS:85061307254
VL - 50
SP - 2014
EP - 2021
JO - Metallurgical and Materials Transactions A: Physical Metallurgy and Materials Science
JF - Metallurgical and Materials Transactions A: Physical Metallurgy and Materials Science
SN - 1073-5623
IS - 4
ER -