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Strengthening mechanisms and strain hardening behavior of 316L stainless steel manufactured by laser-based powder bed fusion

Taghipour, Aliakbar and Mazaheri, Yousef and McDavid, Jascha and Sheikhi, Shahram and Braun, Moritz and Shen, Junjun and Klusemann, Benjamin and Ehlers, Sören (2022) Strengthening mechanisms and strain hardening behavior of 316L stainless steel manufactured by laser-based powder bed fusion. Advanced Engineering Materials. Wiley. doi: 10.1002/adem.202201230. ISSN 1438-1656.

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Abstract

The microstructure-properties relations and strengthening mechanisms of additively manufactured 316L stainless steel is comprehensively investigated in this work. The orientation dependency and the strain hardening are studied by tensile testing of as-built specimens fabricated by laser-based powder bed fusion (LPBF) in different directions. The results are compared with those obtained for wrought material. The microstructure of the wrought and the LPBF materials are also comprehensively investigated. Equiaxed grains with random orientation and relatively uniform size (∽30 μm) are observed in the wrought material, where the LPBF samples showed columnar grains inside as well as fine equiaxed grains in the bottom of the molten pool. A bimodal grain size distribution, higher values of geometrically necessary dislocations density (∽25-32%) and lower fractions of high-angle grain boundaries (∽24-28%) is observed in LPBF 316L. A significant yield strength and considerable ultimate strength improvement without remarkable elongation decrease is obtained for the LPBF tensile specimens, resulting in a high strength-elongation balance (up to 26122 MPa%). Two-stage strain hardening is depicted in both wrought and LPBF samples. However, the LPBF samples illustrated lower strain hardening exponents in comparison with the wrought ones. The plastic region of true stress-strain curves is successfully predicted with two-stage Hollomon analysis results.

Item URL in elib:https://elib.dlr.de/189364/
Document Type:Article
Title:Strengthening mechanisms and strain hardening behavior of 316L stainless steel manufactured by laser-based powder bed fusion
Authors:
AuthorsInstitution or Email of AuthorsAuthor's ORCID iDORCID Put Code
Taghipour, AliakbarTUHHUNSPECIFIEDUNSPECIFIED
Mazaheri, YousefUNSPECIFIEDUNSPECIFIEDUNSPECIFIED
McDavid, JaschaTUHHUNSPECIFIEDUNSPECIFIED
Sheikhi, ShahramTUHHUNSPECIFIEDUNSPECIFIED
Braun, MoritzTUHHUNSPECIFIEDUNSPECIFIED
Shen, JunjunhereonUNSPECIFIEDUNSPECIFIED
Klusemann, BenjaminhereonUNSPECIFIEDUNSPECIFIED
Ehlers, SörenUNSPECIFIEDhttps://orcid.org/0000-0001-5698-9354UNSPECIFIED
Date:19 October 2022
Journal or Publication Title:Advanced Engineering Materials
Refereed publication:Yes
Open Access:Yes
Gold Open Access:No
In SCOPUS:Yes
In ISI Web of Science:Yes
DOI:10.1002/adem.202201230
Publisher:Wiley
ISSN:1438-1656
Status:Published
Keywords:316L stainless steel; Additive manufacturing; Strain hardening; Mechanical properties; Orientation dependency
HGF - Research field:Energy
HGF - Program:other
HGF - Program Themes:E - no assignment
DLR - Research area:Energy
DLR - Program:E - no assignment
DLR - Research theme (Project):E - no assignment
Location: Geesthacht
Institutes and Institutions:Institute of Maritime Energy Systems
Deposited By: Ortner, Dr.rer.nat. Jürgen
Deposited On:25 Nov 2022 08:36
Last Modified:05 Mar 2024 11:28

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