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  4. The microstructure, mechanical properties and corrosion resistance of 316 L stainless steel fabricated using laser engineered net shaping
 
research article

The microstructure, mechanical properties and corrosion resistance of 316 L stainless steel fabricated using laser engineered net shaping

Zietala, Michal
•
Durejko, Tomasz
•
Polanski, Marek
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2016
Materials Science And Engineering A-Structural Materials Properties Microstructure And Processing

The mechanical properties and corrosion resistance of 316 L stainless steel fabricated using the Laser Engineered Net Shaping (LENS) technique have been studied. The crack-free, full density samples made using SS316L alloy powder and the LENS technique are characterized by an unusual distinct dual-phase microstructure. STEM analysis revealed a significant increase of Cr and Mo content and a decrease of Ni in the grain boundaries. Based on the Cr and Ni content (austenite stabilizing elements), the Schaeffler diagram and the EBSD results, the existence of intercellular delta ferrite on subgrain boundaries and austenite in the fine-grains are observed. The XRD patterns, in addition to the FCC austenite phase, revealed the second BCC ferrite phase. Moreover, the sigma (FeCr) phases are present in the analyzed 316 L stainless steel. The occurrence of ferrite, which does not occur in regular stainless steel fabricated using conventional metallurgical methods, improves the mechanical and corrosion properties of the LENS-fabricated sample made using 316 L stainless steel powder. The obtained results prove that the microstructure of the SS316L fabricated using LENS is heterogeneous; its impact on the mechanical properties is visible. The analyzed samples are characterized by anisotropic mechanical properties that are favorable. For both the perpendicular and parallel directions of tensile tests, samples had a ductile fracture with many dimples inside of the larger dimples. The corrosion potential of SS316L LENS and classically manufactured steel is similar. The SS316L fabricated using LENS is characterized by a relatively low value of corrosion current density, which translates into much smaller corrosion rates. (C) 2016 Elsevier B.V. All rights reserved.

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Type
research article
DOI
10.1016/j.msea.2016.09.028
Web of Science ID

WOS:000386986100001

Author(s)
Zietala, Michal
Durejko, Tomasz
Polanski, Marek
Kunce, Izabela
Plocinski, Tomasz  
Zielinski, Witold
Lazinska, Magdalena
Stepniowski, Wojciech
Czujko, Tomasz
Kurzydlowski, Krzysztof J.
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Date Issued

2016

Publisher

Elsevier Science Sa

Published in
Materials Science And Engineering A-Structural Materials Properties Microstructure And Processing
Volume

677

Start page

1

End page

10

Subjects

316 L stainless steel

•

Structure

•

Mechanical properties

•

Additive manufacturing

•

Laser engineered net shaping

Editorial or Peer reviewed

REVIEWED

Written at

EPFL

EPFL units
CIME  
Available on Infoscience
January 24, 2017
Use this identifier to reference this record
https://infoscience.epfl.ch/handle/20.500.14299/133634
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