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research article

Site-specifically tailored microstructures with enhanced strength and hardening through laser powder bed fusion

Sofras, C.  
•
Capek, J.
•
Li, X.
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December 20, 2023
Materials & Design

Laser powder bed fusion (L-PBF) has emerged as an additive manufacturing technique that offers unprecedented design freedom. Besides being capable of producing complex and near net shape objects, L-PBF can impact tremendously the engineering materials community due to the possibility of locally manipulating metallic microstructures. Here we exploit the latter potentiality of L-PBF, to produce site-specifically tailored stainless steel components, in terms of their crystallographic texture. The tailored materials are tested and exhibit superior energy dissipation capabilities under bending deformation compared to uniformly textured materials. This is enabled by the strong dependence of the secondary hardening mechanisms, namely the deformation twinning and/or martensite formation, of these materials on the locally tuned microstructures. With the aid of finite element simulations, it is possible to identify the stress state and hence, the crystallographic orientations that facilitate twinning or martensite formation. Then, by engineering favorable crystallographic textures, matched to the complex stress state during bending, enhanced work hardening behavior is obtained. This site-specific microstructure design enabled by L-PBF provides a new pathway for the design of "smart" components that exhibit superior mechanical response under complex stress states.

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Type
research article
DOI
10.1016/j.matdes.2023.112539
Web of Science ID

WOS:001142479700001

Author(s)
Sofras, C.  
Capek, J.
Li, X.
Roth, C. C.
Leinenbach, C.  
Loge, R. E.  
Strobl, M.
Polatidis, E.
Date Issued

2023-12-20

Published in
Materials & Design
Volume

237

Article Number

112539

Subjects

Technology

•

Additive Manufacturing

•

Stainless Steel

•

Deformation Twinning

•

Mechanical Behavior

Editorial or Peer reviewed

REVIEWED

Written at

EPFL

EPFL units
LMTM  
FunderGrant Number

Swiss National Science Foundation (SNSF)

200021_188767

PX Group

Available on Infoscience
February 21, 2024
Use this identifier to reference this record
https://infoscience.epfl.ch/handle/20.500.14299/205053
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