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Recent Progress in the Development, Material Properties, and Post-Processing of...
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Recent Progress in the Development, Material Properties, and Post-Processing of Additively Manufactured 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 (31 January 2021) | Viewed by 4226

Special Issue Editors

Prof. Dr. Abdollah Saboori

E-Mail Website
Guest Editor
Integrated Additive Manufacturing Center, Department of Management and Production engineering, Politecnico di Torino, Corso duca degli Abruzzi 24, 10129 Torino, Italy
Interests: metal additive manufacturing; selective laser melting; electron beam melting; directed energy deposition; stainless steel; titanium alloys; metal matrix composites; materials characterization
Special Issues, Collections and Topics in MDPI journals
Dr. Giulio Marchese

E-Mail Website
Guest Editor
Department of Applied Science and Technology, Politecnico di Torino, Corso Duca degli Abruzzi 24, 10129 Turin, Italy
Interests: additive manufacturing; electron beam melting; laser powder bed fusion; thermal treatments; Ni-based superalloys; Inconel 625; Inconel 718; Ni-based superalloy with high crack susceptibility; high-temperature alloys; alloys development; metal matrix composites; materials characterization; metal alloys
Special Issues, Collections and Topics in MDPI journals

Special Issue Information

Dear Colleagues,

Additive manufacturing (AM) includes a set of processes in which a complex component can be produced in a layer-wise fashion using the heating provided by a laser or electron source. AM is a rapidly growing manufacturing capability. This technology is expected to revolutionize the fabrication of complex-shaped parts, in particular for application fields, where complex geometries, highly customized parts, small part production numbers and/or lead-time saving, play a decisive role. Nonetheless, despite all the remarkable efforts, there are significant challenges that are limiting the wider uptake and exploitation of AM, spanning across the entire AM supply chain. These include a lack of AM design and modelling skills and software, a gap in understanding in properties obtained from different machines and technologies, and their effect on part failure. Moreover, the mechanical performance of AM parts can be enhanced by post-processing, such as heat treatments. This Special Issue is dedicated to disseminate these recent scientific efforts. For this Special Issue in Materials, it is our pleasure to invite you to submit reviews and articles in the areas of material supply, part design, process modelling, process technology, post-processing techniques, and applications of AM.

Dr. Abdollah Saboori
Dr. Giulio Marchese
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
  • Materials Properties
  • Materials Development
  • Design
  • Post-Processing

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Published Papers (1 paper)

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Research

18 pages, 4803 KiB  
Article
Electron Backscattered Diffraction to Estimate Residual Stress Levels of a Superalloy Produced by Laser Powder Bed Fusion and Subsequent Heat Treatments
by Mathieu Terner, Jiwon Lee, Giulio Marchese, Sara Biamino and Hyun-Uk Hong
Materials 2020, 13(20), 4643; https://doi.org/10.3390/ma13204643 - 17 Oct 2020
Cited by 13 | Viewed by 3351
Abstract
Metal Additive Manufacturing and Laser Powder Bed Fusion (LPBF), in particular, have come forth in recent years as an outstanding innovative manufacturing approach. The LPBF process is notably characterized by very high solidification and cooling rates, as well as repeated abrupt heating and [...] Read more.
Metal Additive Manufacturing and Laser Powder Bed Fusion (LPBF), in particular, have come forth in recent years as an outstanding innovative manufacturing approach. The LPBF process is notably characterized by very high solidification and cooling rates, as well as repeated abrupt heating and cooling cycles, which generate the build-up of anisotropic microstructure and residual stresses. Post-processing stress-relieving heat treatments at elevated temperatures are often required in order to release some of these stresses. The effects of 1 h–hold heat treatments at different specific temperatures (solutionizing, annealing, stress-relieve and low-temperature stress-relieve) on residual stress levels together with microstructure characterization were therefore investigated for the popular Alloy 625 produced by LPBF. The build-up of residual stress is accommodated by the formation of dislocations that produce local crystallographic misorientation within grains. Electron backscattered diffraction (EBSD) was used to investigate local misorientation by means of orientation imaging, thereby assessing misorientation or strain levels, in turn representing residual stress levels within the material. The heavily constrained as-built material was found to experience full recrystallization of equiaxed grains after solutionizing at 1150 °C, accompanied by significant drop of residual stress levels due to this grains reconfiguration. Heat treatments at lower temperatures however, even as high as the annealing temperature of 980 °C, were found to be insufficient to promote recrystallization though effective to some extent to release residual stress through apparently dislocations recovery. Average misorientation data obtained by EBSD were found valuable to evaluate qualitatively residual stress levels. The effects of the different heat treatments are discussed and suggest that the peculiar microstructure of alloys produced by LPBF can possibly be transformed to suit specific applications. Full article
(This article belongs to the Special Issue Recent Progress in the Development, Material Properties, and Post-Processing of Additively Manufactured Components)
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