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Crystals
Special Issues
Additive and Subtractive Manufacturing of Metallic Materials: Process-Structure-Property-Performance Relationships
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Additive and Subtractive Manufacturing of Metallic Materials: Process-Structure-Property-Performance Relationships

A special issue of Crystals (ISSN 2073-4352). This special issue belongs to the section "Crystalline Metals and Alloys".

Deadline for manuscript submissions: 20 November 2024 | Viewed by 361

Special Issue Editors

Dr. Muhammad Arif Mahmood

E-Mail Website
Guest Editor
Intelligent Systems Center, Missouri University of Science and Technology, Rolla, MO 65401, USA
Interests: additive manufacturing; laser-material interaction; tribology; process automation, modelling
Special Issues, Collections and Topics in MDPI journals
Dr. Asad Waqar Malik

E-Mail Website
Guest Editor
Intelligent Systems Center, Missouri University of Science and Technology, Rolla, MO 65401, USA
Interests: cyberphysical systems; distributed digital factories; cyber security
Prof. Dr. Frank Liou

E-Mail Website
Guest Editor
Department of Mechanical and Aerospace Engineering, Missouri University of Science and Technology, Rolla, MO 65409, USA
Interests: metal additive manufacturing (AM); novel AM process development and process planning; rapid prototyping; multiscale multiphysics AM process modeling; remanufacturing automation; AM process monitoring and control; digital materials processing

Special Issue Information

Dear Colleagues,

The integration of additive manufacturing (AM) and subtractive manufacturing (SM) processes with in situ monitoring and feedback is a cutting-edge approach in the field of advanced manufacturing. This concept seeks to combine the strengths of both AM and SM, while incorporating near–real-time monitoring and feedback to enhance the overall manufacturing process. AM involves creating 3D objects by adding a material layer by layer, offering design freedom and complexity that traditional subtractive methods cannot achieve. However, it may suffer from issues, such as a poor surface finish and dimensional accuracy. On the other hand, SM removes the material to shape an object and excels in achieving precise dimensions and a high surface quality, but can be limited in terms of its complex geometries and material wastage. The integration of these two processes aims to overcome these limitations by leveraging the strengths of each technique. Additionally, in situ monitoring and feedback systems using digital twins are incorporated into the manufacturing process to ensure high-quality control, detect defects, and make necessary adjustments during manufacturing. The key benefits of this integration include an improved part quality, reduced material waste, shorter lead times, and enhanced design flexibility, thereby also supporting industry 4.0 and digital factories.

The primary purpose of this Special Issue is to deliver an intercontinental forum for ground-breaking research on experiments and modelling using additive and subtractive manufacturing processes, in situ monitoring and feedback via manufacturing processes, the development of new materials and their parameters optimization, and the development of sophisticated data-driven models and their implementation in manufacturing processes. 

Dr. Muhammad Arif Mahmood
Dr. Asad Waqar Malik
Prof. Dr. Frank Liou
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. Crystals 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 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
  • subtractive manufacturing
  • in situ monitoring and feedback
  • physics-based and data-driven modelling

Published Papers (1 paper)

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Research

20 pages, 27611 KiB  
Article
Effect of Rotational Shear and Heat Input on the Microstructure and Mechanical Properties of Large-Diameter 6061 Aluminium Alloy Additive Friction Stir Deposition
by Xiaohu Zhu, Rui Wang, Lin Wang, Mengmeng Liu and Songmo Li
Crystals 2024, 14(7), 581; https://doi.org/10.3390/cryst14070581 - 25 Jun 2024
Viewed by 133
Abstract
Additive friction stir deposition (AFSD), in which molten metal materials are formed into free-form stacked structural parts according to the path design, may have a wide range of applications in high-efficiency mass production. In this study, experiments were conducted for the rotational speed [...] Read more.
Additive friction stir deposition (AFSD), in which molten metal materials are formed into free-form stacked structural parts according to the path design, may have a wide range of applications in high-efficiency mass production. In this study, experiments were conducted for the rotational speed in the AFSD parameters of 6061 aluminium alloy bars to investigate the effects of different rotational shear conditions and heat inputs on the properties of the deposited layer for diameter bars based on the analysis of the micro-morphology, micro-tissue composition, and mechanical properties. The width and thickness of each layer were constant, approximately 40 mm wide and 2.5 mm thick. The particle undulations on the surface of the deposited layer were positively correlated with the AFSD rotational speed. Continuous dynamic recrystallisation in the AFSD process can achieve more than 90% grain refinement. When the rotational speed increases, it causes localised significant orientation and secondary deformation within the recrystallised grains. The ultimate tensile strength of the deposited layer was positively correlated with the rotational speed, reaching a maximum of 211 MPa, and the elongation was negatively correlated with the rotational speed, with a maximum material elongation of 37%. The cross-section hardness of the deposited layer was negatively correlated with the number of thermal cycles, with the lowest hardness being about 45% of the base material and the highest hardness being about 80% of the base material. Full article
(This article belongs to the Special Issue Additive and Subtractive Manufacturing of Metallic Materials: Process-Structure-Property-Performance Relationships)
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