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The Effects of Process Parameters and Geometrical Features on the Mechanical Performance of AM Components

A special issue of Materials (ISSN 1996-1944). This special issue belongs to the section "Manufacturing Processes and Systems".

Deadline for manuscript submissions: closed (30 December 2021) | Viewed by 2703

Special Issue Editors


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Guest Editor
Department of Information Systems, Supply Chain Management & Decision Support, NEOMA Business School, 1 Rue du Maréchal Juin, 76130 Mont-Saint-Aignan, France
Interests: supply chain management; digital supply chain management; circular economy; hydrogen supply chain; decision support systems; additive manufacturing; Industry 4.0
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Department of Mechanical and Industrial Engineering, Norwegian University of Science and Technology (NTNU), Richard Birkelands vei 2b, 7194 Trondheim, Norway
Interests: additive manufacturing; structural integrity; fatigue; fracture; metamaterials; failure analysis of sustainable materials
Special Issues, Collections and Topics in MDPI journals

Special Issue Information

Dear Colleagues,

The advent of additive manufacturing (AM) represents a breakthrough in product design and development. AM, in fact, gives unprecedented geometrical design freedom, which can result in significant reductions in component weight (e.g., through part count reduction or topology optimization). However, the mechanical behavior of AM components, particularly the fatigue and fracture behavior, are still somehow uncertain, thus limiting the potential extraordinary impact of AM. The uncertainties in mechanical behavior are mainly due to the fact that the material properties evolve during the fabrication process. Every change in the building routine (caused by any change in the geometry and/or in the process parameters) affects the toolpath and, ultimately, the properties of the resulting component—even a small change in the toolpath can lead to big variations in the mechanical behavior of the component.

This Special Issue of Materials aims at bringing together papers investigating the effect of process parameters, building routines, and geometrical features on the mechanical behavior of AM components for applications that vary from biomedical engineering to aerospace components. Particularly, but not exclusively, the Special Issue focuses on fatigue and fracture behavior. The submission of papers on numerical simulation or reporting experimental work, or a combination of both, is welcome.

Dr. Mirco Peron
Prof. Dr. Seyed Mohammad Javad Razavi
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 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

  • additive manufacturing
  • process parameters
  • geometrical features
  • fatigue and fracture
  • mechanical behavior
  • microstructure
  • finite element models
  • metals
  • polymers and composites
  • ceramics

Published Papers (1 paper)

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Research

16 pages, 10731 KiB  
Article
Effects of Laser Spot Size on the Mechanical Properties of AISI 420 Stainless Steel Fabricated by Selective Laser Melting
by Xi-Huai Yang, Chong-Ming Jiang, Jeng-Rong Ho, Pi-Cheng Tung and Chih-Kuang Lin
Materials 2021, 14(16), 4593; https://0-doi-org.brum.beds.ac.uk/10.3390/ma14164593 - 16 Aug 2021
Cited by 14 | Viewed by 2081
Abstract
The purpose of this study is to investigate the effects of laser spot size on the mechanical properties of AISI 420 stainless steel, fabricated by selective laser melting (SLM), process. Tensile specimens were built directly via the SLM process, using various laser spot [...] Read more.
The purpose of this study is to investigate the effects of laser spot size on the mechanical properties of AISI 420 stainless steel, fabricated by selective laser melting (SLM), process. Tensile specimens were built directly via the SLM process, using various laser spot diameters, namely 0.1, 0.2, 0.3, and 0.4 mm. The corresponding volumetric energy density (EV) is 80, 40, 26.7, and 20 J/mm3, respectively. Experimental results indicate that laser spot size is an important process parameter and has significant effects on the surface roughness, hardness, density, tensile strength, and microstructure of the SLM AISI 420 builds. A large laser spot with low volumetric energy density results in balling, un-overlapped defects, a large re-heated zone, and a large sub-grain size. As a result, SLM specimens fabricated by the largest laser spot diameter of 0.4 mm exhibit the roughest surface, lowest densification, and lowest ultimate tensile strength. To ensure complete melting of the powder and melt pool stability, EV of 80 J/mm3 proves to be a suitable laser energy density value for the given SLM processing and material system. Full article
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