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

M. Ziętala , T. Durejko , M. Polanski , I. Kunce , Tomasz Płociński , Witold Zieliński , M. Łazińska , Wojciech J. Stępniowski , T. Czujko , Krzysztof Kurzydłowski , Z. Bojar

Abstract

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. © 2016 Elsevier B.V.
Author M. Ziętala
M. Ziętala,,
-
, T. Durejko
T. Durejko,,
-
, M. Polanski
M. Polanski,,
-
, I. Kunce
I. Kunce,,
-
, Tomasz Płociński ZPM
Tomasz Płociński,,
- Division of Materials Design
, Witold Zieliński ZPM
Witold Zieliński,,
- Division of Materials Design
, M. Łazińska
M. Łazińska,,
-
, Wojciech J. Stępniowski
Wojciech J. Stępniowski,,
-
, T. Czujko
T. Czujko,,
-
, Krzysztof Kurzydłowski ZPM
Krzysztof Kurzydłowski,,
- Division of Materials Design
et al.`
Journal seriesMaterials Science and Engineering A-Structural Materials Properties Microstructure And Processing, ISSN 0921-5093
Issue year2016
Vol677
Pages1 - 10
Publication size in sheets0.5
Keywords in English316 L stainless steel; Additive manufacturing; Laser engineered net shaping; Mechanical properties; Structure
DOIDOI:10.1016/j.msea.2016.09.028
URL https://www.scopus.com/inward/record.uri?eid=2-s2.0-84987942362&partnerID=40&md5=549277df880ad89d66e0244ffede8c6e
Languageen angielski
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The-microstructure--mechanical-properties-and-corrosion-_2016_Materials-Scie.pdf 4.74 MB
Score (nominal)35
ScoreMinisterial score [Punktacja MNiSW] = 35.0, 28-11-2017, ArticleFromJournal
Ministerial score (2013-2016) [Punktacja MNiSW (2013-2016)] = 35.0, 28-11-2017, ArticleFromJournal
Publication indicators WoS Impact Factor [Impact Factor WoS]: 2016 = 3.094 (2) - 2016=3.242 (5)
Citation count*42 (2018-06-17)
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* presented citation count is obtained through Internet information analysis and it is close to the number calculated by the Publish or Perish system.
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