Special Issue "Fatigue Damage of Additively-Manufactured Metallic Materials"

A special issue of Metals (ISSN 2075-4701).

Deadline for manuscript submissions: 30 September 2018

Special Issue Editor

Guest Editor
Prof. Matteo Benedetti

Department of Industrial Engineering, University of Trento, Trento, Italy
Website | E-Mail
Interests: mechanics of materials; fatigue of metal; machine design; additive manufacturing

Special Issue Information

Dear Colleagues,

Additive Manufacturing (AM), sometimes colloquially termed 3D-printing, comprises net-shape production technologies that build a solid object from the sequential superposition of layers representing the cross-sections obtained by virtually slicing the 3D model of the component. Nowadays, AM is becoming a key enabling technology for direct fabrication of functional or structural end-use products and is already revolutionizing, not only the way we produce, but also the design guidelines.

Since 1990, several AM technologies have been developed to sinter metallic powders. They can be distinguished regarding the way in which the layers of material are deposited and consolidated. In powder bed fusion processes, the powder is spread to a controlled thickness over the build platform or the previously built layers. After powder consolidation, the build platform is lowered and a new layer is spread. The process repeats until the entire model is created. Different heat sources are used to sinter or fuse the powder. For instance, a laser or an electron beam is adopted in Selective Laser Melting (SLM)/Selective Laser Sintering (SLS)/Direct Metal Laser Sintering (DMLS) or Electron Beam Melting (EBM), respectively. In all cases, the heat input is intense and highly localized so that the process parameters must be carefully tuned, especially in terms of scan speed, pattern and energy density.

Typically, additively manufactured metallic components show characteristic cast structure, with high superficial roughness, porosity, heterogeneous microstructure, and residual stresses, which negatively affect the mechanical properties, especially the fatigue strength. Therefore, there is an increasing acknowledgement in the engineering community that special care must be taken to understand how AM affects the fatigue properties, the way they can be enhanced and how the design guidelines must be updated in view of this innovative fabrication route.

The aim of this Special Issue is to collect papers aimed at investigating the fatigue damage of additively manufactured metallic material, with special emphasis on understanding and deploying physics of fatigue, advancing experimental and theoretical failure analysis, and structural design that accounts for scale, microstructural, and environmental effects.

Prof. Matteo Benedetti
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 papers will be 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. Metals is an international peer-reviewed open access monthly 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 1200 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
  • Selective laser melting
  • Electron beam melting
  • Fatigue
  • Crack growth
  • Design
  • Defects
  • Residual stresses
  • Fabrication process optimization.

Published Papers (1 paper)

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Review

Open AccessReview A Review of the As-Built SLM Ti-6Al-4V Mechanical Properties towards Achieving Fatigue Resistant Designs
Metals 2018, 8(1), 75; https://doi.org/10.3390/met8010075
Received: 27 December 2017 / Revised: 16 January 2018 / Accepted: 18 January 2018 / Published: 19 January 2018
Cited by 4 | PDF Full-text (3968 KB) | HTML Full-text | XML Full-text
Abstract
Ti-6Al-4V has been widely used in both the biomedical and aerospace industry, due to its high strength, corrosion resistance, high fracture toughness and light weight. Additive manufacturing (AM) is an attractive method of Ti-6Al-4V parts’ fabrication, as it provides a low waste alternative
[...] Read more.
Ti-6Al-4V has been widely used in both the biomedical and aerospace industry, due to its high strength, corrosion resistance, high fracture toughness and light weight. Additive manufacturing (AM) is an attractive method of Ti-6Al-4V parts’ fabrication, as it provides a low waste alternative for complex geometries. With continued progress being made in SLM technology, the influence of build layers, grain boundaries and defects can be combined to improve further the design process and allow the fabrication of components with improved static and fatigue strength in critical loading directions. To initiate this possibility, the mechanical properties, including monotonic, low and high cycle fatigue and fracture mechanical behaviour, of machined as-built SLM Ti-6Al-4V, have been critically reviewed in order to inform the research community. The corresponding crystallographic phases, defects and layer orientations have been analysed to determine the influence of these features on the mechanical behaviour. This review paper intends to enhance our understanding of how these features can be manipulated and utilised to improve the fatigue resistance of components fabricated from Ti-6Al-4V using the SLM technology. Full article
(This article belongs to the Special Issue Fatigue Damage of Additively-Manufactured Metallic Materials)
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