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Microstructure and Mechanical Properties of Laser Additive Manufactured Metals II
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Microstructure and Mechanical Properties of Laser Additive Manufactured Metals II

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

Deadline for manuscript submissions: 10 August 2024 | Viewed by 5485

Special Issue Editor

Prof. Dr. Mariangela Lombardi

E-Mail Website
Guest Editor
1. Integrated Additive Manufacturing Center (IAM)—Politecnico di Torino, Corso Castelfidardo, 51, 10129 Torino, Italy
2. Department of Applied Science and Technology (DISAT), Politecnico di Torino, Corso Duca Degli Abruzzi, 24, 10129 Torino, Italy
Interests: laser powder bed fusion; directed energy deposition; aluminum alloys; microstructures; mechanical properties
Special Issues, Collections and Topics in MDPI journals

Special Issue Information

Dear Colleagues,

Laser additive manufacturing technologies such as laser powder bed fusion and directed energy deposition are new disruptive technologies for the production of complex-shaped and lightweight metallic components. This is due to the revolution in design approach that additive manufacturing technologies allows. Notwithstanding this, there are still several limitations in suitable metallic alloys. The actual challenges are focused on the development of new compositions and the study of alloys or metal matrix composites for additive manufacturing technologies. Defining innovative compositions, the right window for the main process parameters of additive manufacturing technologies, and the thermal treatment conditions can contribute to the obtainment of additively manufactured metals with interesting mechanical performance.

This Special Issue aims to present the latest research works related to the study of metallic alloys and metal matrix composites processed through laser additive manufacturing technologies, from feedstock preparation to process parameter definition and thermal treatment optimization, focusing the attention on microstructural and mechanical characteristics of the processed materials. Reviews focused on innovations on metals and related composites for laser additive manufacturing are also welcome.

Prof. Dr. Mariangela Lombardi
Guest Editor

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 2600 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

  • laser powder bed fusion
  • directed energy deposition
  • new alloys for additive manufacturing
  • metal matrix composites for additive manufacturing
  • microstructural features and/or evolution
  • phase evolution and/or precipitation
  • mechanical behavior

Published Papers (2 papers)

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Research

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16 pages, 37263 KiB  
Article
On the Influence of Manufacturing Parameters on the Microstructure, Mechanical Properties and Corrosion Resistance of AISI 316L Steel Deposited by Laser Engineered Net Shaping (LENS®)
by Magdalena Rzeszotarska, Dariusz Zasada, Tomasz Płociński, Wojciech J. Stępniowski and Marek Polański
Materials 2023, 16(5), 1965; https://doi.org/10.3390/ma16051965 - 27 Feb 2023
Cited by 2 | Viewed by 1211
Abstract
Samples of 316L SS were manufactured by Laser Engineered Net Shaping (LENS®) using different technological parameters. The deposited samples were investigated in terms of microstructure, mechanical properties, phase content and corrosion resistance (salt chamber and electrochemical corrosion). Parameters were chosen to [...] Read more.
Samples of 316L SS were manufactured by Laser Engineered Net Shaping (LENS®) using different technological parameters. The deposited samples were investigated in terms of microstructure, mechanical properties, phase content and corrosion resistance (salt chamber and electrochemical corrosion). Parameters were chosen to obtain a proper sample built for layer thicknesses of 0.2, 0.4 and 0.7 mm by changing the laser feed rate while keeping the powder feed rate constant. After a comprehensive analysis of the results, it was found that the manufacturing parameters slightly affected the resulting microstructure and also had a minor impact (almost undetectable considering the uncertainty of the measurement) on the mechanical properties of samples. Decreases in resistance to electrochemical pitting corrosion and environmental corrosion with an increased feed rate and a decrease in layer thickness and grain size were observed; however, all additively manufactured samples were found to be less prone to corrosion than the reference material. In the investigated processing window, no influence of deposition parameters on the phase content of the final product was found—all the samples were found to possess austenitic microstructure with almost no detectable ferrite. Full article
(This article belongs to the Special Issue Microstructure and Mechanical Properties of Laser Additive Manufactured Metals II)
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Review

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29 pages, 3912 KiB  
Review
Ongoing Challenges of Laser-Based Powder Bed Fusion Processing of Al Alloys and Potential Solutions from the Literature—A Review
by Alessandra Martucci, Alberta Aversa and Mariangela Lombardi
Materials 2023, 16(3), 1084; https://doi.org/10.3390/ma16031084 - 26 Jan 2023
Cited by 18 | Viewed by 3746
Abstract
Their high strength-to-weight ratio, good corrosion resistance and excellent thermal and electrical conductivity have exponentially increased the interest in aluminium alloys in the context of laser-based powder bed fusion (PBF-LB/M) production. Although Al-based alloys are the third most investigated category of alloys in [...] Read more.
Their high strength-to-weight ratio, good corrosion resistance and excellent thermal and electrical conductivity have exponentially increased the interest in aluminium alloys in the context of laser-based powder bed fusion (PBF-LB/M) production. Although Al-based alloys are the third most investigated category of alloys in the literature and the second most used in industry, their processing by PBF-LB/M is often hampered by their considerable solidification shrinkage, tendency to oxidation, high laser reflectivity and poor powder flowability. For these reasons, high-strength Al-based alloys traditionally processed by conventional procedures have often proved to be unprintable with additive technology, so the design and development of new tailored Al-based alloys for PBF-LB/M production is necessary. The aim of the present work is to explore all the challenges encountered before, during and after the PBF-LB/M processing of Al-based alloys, in order to critically analyse the solutions proposed in the literature and suggest new approaches for addressing unsolved problems. The analysis covers the critical aspects in the literature as well as industrial needs, industrial patents published to date and possible future developments in the additive market. Full article
(This article belongs to the Special Issue Microstructure and Mechanical Properties of Laser Additive Manufactured Metals II)
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