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Special Issue "Advances in Duplex Stainless Steels (Second Volume)"

A special issue of Materials (ISSN 1996-1944). This special issue belongs to the section "Metals and Alloys".

Deadline for manuscript submissions: 31 December 2023 | Viewed by 711

Special Issue Editors

Department of Industrial Engineering, University of Padova, Padova, Italy
Interests: physical metallurgy; stainless steels; electroplasticity; welding; duplex stainless steel; additive manufacturing; corrosion
Special Issues, Collections and Topics in MDPI journals
Department of Industrial Engineering, University of Padova, Padua, Italy
Interests: stainless steels; corrosion mechanism; surface treatments; light alloys
Special Issues, Collections and Topics in MDPI journals

Special Issue Information

Dear Colleagues,

Duplex stainless steels (DSSs) were developed in the 1930s, and gradually found an increasing number applications thanks to their high strength, good weldability, good toughness and resistance to stress corrosion cracking. Although the use of DSSs is well-established in many industrial sectors (e.g., oil and gas), the research and innovations in the field are always growing. In particular, the recent research has focused on the development of new high-grade DSSs (the so-called hyper-duplex steels) and on the production of components through technologies based on the additive manufacturing (AM) concept, mainly laser-based ones.

In all cases, a strong correlation between the microstructural characterization and the investigated properties was the key point of the performed research.

The purpose of this Special Issue is to correlate the microstructure of DSSs with their mechanical and corrosion properties, with special attention to novel DSS grades or novel production technologies such as AM.

I invite you to submit both original contributions and review works on this topic, with papers that deal both with the characterization and with the mechanical and corrosion resistance evaluation of different DSS grades.

Dr. Irene Calliari
Dr. Luca Pezzato
Guest Editors

Manuscript Submission Information

Manuscripts should be submitted online at www.mdpi.com by registering and logging in to this website. Once you are registered, click here to go to the submission form. Manuscripts can be submitted until the deadline. All submissions that pass pre-check are peer-reviewed. Accepted papers will be published continuously in the journal (as soon as accepted) and will be listed together on the special issue website. Research articles, review articles as well as short communications are invited. For planned papers, a title and short abstract (about 100 words) can be sent to the Editorial Office for announcement on this website.

Submitted manuscripts should not have been published previously, nor be under consideration for publication elsewhere (except conference proceedings papers). All manuscripts are thoroughly refereed through a single-blind peer-review process. A guide for authors and other relevant information for submission of manuscripts is available on the Instructions for Authors page. Materials is an international peer-reviewed open access semimonthly journal published by MDPI.

Please visit the Instructions for Authors page before submitting a manuscript. The Article Processing Charge (APC) for publication in this open access journal is 2300 CHF (Swiss Francs). Submitted papers should be well formatted and use good English. Authors may use MDPI's English editing service prior to publication or during author revisions.

Keywords

  • stainless steel
  • microstructure
  • mechanical properties
  • corrosion resistance
  • austenite
  • ferrite
  • metals characterization

Published Papers (1 paper)

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Research

Article
Increasing the Corrosion Resistance in the UNS S32750 Super Duplex Steel Welded Joints through Hybrid GTAW-Laser Welding and Nitrogen
Materials 2023, 16(2), 543; https://doi.org/10.3390/ma16020543 - 05 Jan 2023
Cited by 1 | Viewed by 503
Abstract
The development of techniques to improve the welding of super duplex steels is necessary in order to ensure that the phase balance and properties of the material are not affected during this process. Hybrid arc-laser welding is a perfect combination of the advantages [...] Read more.
The development of techniques to improve the welding of super duplex steels is necessary in order to ensure that the phase balance and properties of the material are not affected during this process. Hybrid arc-laser welding is a perfect combination of the advantages of both processes, producing deeper weld beads with more balanced phases than the pulsed laser process. Here, the objective was to improve the corrosion resistance of UNS S32750 weld beads by increasing the volumetric austenite percentage in the fusion zone (FZ) with a hybrid process of GTAW (gas tungsten arc welding) and pulsed laser Nd-YAG (neodymium-doped yttrium aluminum garnet). Welds were performed in bead on plate conditions with fixed laser parameters and a varying heat input introduced through the GTAW process. Additionally, welds within a nitrogen atmosphere were performed. After base metal characterization, an analysis of the FZ and heat affected zone were performed with optical microscopy, scanning electron microscopy and critical pitting tests (CPT). The synergy between the thermal input provided by the hybrid process and austenite-promoting characteristic of nitrogen led to a balanced volumetric austenite/ferrite fraction. Consequently, the results obtained in CPT tests were better than conventional welding processes, such as laser or GTAW solely. Full article
(This article belongs to the Special Issue Advances in Duplex Stainless Steels (Second Volume))
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