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Micromachines
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Advanced Additive Manufacturing Techniques: From Fundamental Research to Applications, 2nd...
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Advanced Additive Manufacturing Techniques: From Fundamental Research to Applications, 2nd Edition

A special issue of Micromachines (ISSN 2072-666X). This special issue belongs to the section "D3: 3D Printing and Additive Manufacturing".

Deadline for manuscript submissions: 30 November 2024 | Viewed by 2553

Special Issue Editor

Dr. Reza Teimouri

E-Mail Website
Guest Editor
Faculty of Mechanical Engineering, Cracow University of Technology, 31-864 Kraków, Poland
Interests: additive manufacturing; machining and cutting tool; surface integrity; fatigue; precision machining
Special Issues, Collections and Topics in MDPI journals

Special Issue Information

Dear Colleagues,

Additive manufacturing (AM) is a technology that constructs complex 3D geometries via adding multiple layers of material, based on digital computer-aided design models. The nature of the production method of additive manufacturing has provided several advantages when compared to conventional subtractive processes, which can be placed into categories of properties and shapes. However, despite the enormous advantages of additive manufacturing, the process suffers from poor surface integrity and sequential deteriorated structural properties.

This Special Issue, entitled “Advanced Additive Manufacturing Techniques: From Fundamental Research to Applications, 2nd Edition”, includes (but is not limited to) the methodologies that are being used to enhance the structural integrity of AM materials from a scientific point of view and how they can be applied in industry more frequently. We welcome research concerning all kinds of metallic, polymeric, ceramic, and composite materials, outlining the enhancement of the properties, shape accuracy, and sustainability of AM in production. Review articles, communications, and full-size research papers are all welcome.

We look forward to receiving your submissions.

Dr. Reza Teimouri
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. Micromachines 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
  • surface integrity
  • mechanical properties
  • post-treatment
  • selective laser melting
  • 3D printing

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Related Special Issue

Published Papers (3 papers)

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Research

11 pages, 4055 KiB  
Article
Quick-Delivery Mold Fabricated via Stereolithography to Enhance Manufacturing Efficiency
by Jae Hyang Lee, Seonghwan Park, Jeon Taik Lim, Hyung Sun Yoon, Jae Won Choi, Cheol Woo Ha and Jiyong Park
Micromachines 2024, 15(11), 1345; https://doi.org/10.3390/mi15111345 - 31 Oct 2024
Viewed by 585
Abstract
The ever-growing demand for reducing costs and decreasing the time to market in today’s plastics industry makes rapid tooling and rapid prototyping highly researched areas. Stereolithography (SLA)-manufactured injection mold inserts make it possible to produce prototype parts rapidly and cost-effectively. To utilize SLA [...] Read more.
The ever-growing demand for reducing costs and decreasing the time to market in today’s plastics industry makes rapid tooling and rapid prototyping highly researched areas. Stereolithography (SLA)-manufactured injection mold inserts make it possible to produce prototype parts rapidly and cost-effectively. To utilize SLA in the injection molding industry, two steps have to be considered. The first is to identify suitable SLA process and post-thermal curing process parameters to enhance the mechanical and thermal characteristics. The second is to verify the applicability of SLA-manufactured molds for use in the injection molding industry. IA comprehensive study was performed to find the optimum process parameters for an SLA mold with excellent mechanical and thermal properties and to verify the applicability of the mold. First of all, the mechanical and thermal properties of samples manufactured based on various laser powers and heat treatment at different temperatures were analyzed with a tensile test, DSC, and TMA according to the degree of cure. On the basis of the results from those tests, an SLA mold was designed and fabricated with the optimum mechanical and thermal properties. In addition, the SLA mold was assembled into an injection machine, and an injection molding test was conducted. The SLA mold endured during the injection cycle, and 500 shots were successfully injected without damaging the mold, which resulted in reaching the quick-delivery mold standard. Finally, we demonstrate that SLA is an effective technology to produce molds for use in the injection molding industry. Full article
(This article belongs to the Special Issue Advanced Additive Manufacturing Techniques: From Fundamental Research to Applications, 2nd Edition)
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20 pages, 11730 KiB  
Article
Influence of Laser-Based Powder Bed Fusion of Metals Process Parameters on the Formation of Defects in Al-Zn-Mg-Cu Alloy Using Path Analysis
by Biao Huang, Hongqun Tang, Jincheng Huang, Yuanxiang Jia, Liuhui Liao, Shuhuan Pang, Xu Zheng and Zhendong Chen
Micromachines 2024, 15(9), 1121; https://doi.org/10.3390/mi15091121 - 31 Aug 2024
Viewed by 891
Abstract
High-strength aluminium alloys are prone to porosity and cracking during laser-based powder bed fusion of metals (PBF-LB/M) due to the complex solidification behaviour, thus limiting the preparation of high-quality aluminium alloys. In order to effectively reduce the defect formation, this study investigated the [...] Read more.
High-strength aluminium alloys are prone to porosity and cracking during laser-based powder bed fusion of metals (PBF-LB/M) due to the complex solidification behaviour, thus limiting the preparation of high-quality aluminium alloys. In order to effectively reduce the defect formation, this study investigated the influence mechanism of different process parameters on the formation of porosity and cracks in Al-Zn-Mg-Cu alloys in the PBF-LB/M process by combining experimental and numerical simulation. The degree of influence of the process parameters on the temperature field and the temperature field on the defect formation was also quantified using path analysis. The results show that modulation of the process parameters can effectively reduce the formation of cracks and pores, although it is difficult to eliminate them. The melt pool temperature has a significant effect on the formation of porosity, and the temperature gradient has a significant effect on the formation of cracks. The degree of influence of laser power on the melt pool temperature and temperature gradient was greater than that of scanning speed, with values of 0.980 and 0.989, respectively. Therefore, the priority of modulating the laser power is higher than that of scanning speed in order to reduce the formation of defects more effectively. Full article
(This article belongs to the Special Issue Advanced Additive Manufacturing Techniques: From Fundamental Research to Applications, 2nd Edition)
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10 pages, 6424 KiB  
Communication
Synergistic Strength–Ductility Improvement in an Additively Manufactured Body-Centered Cubic HfNbTaTiZr High-Entropy Alloy via Deep Cryogenic Treatment
by Zhuoheng Liang, Zhanggen Ye, Chunfeng Liu, Liangbo Sun and Yongzhong Zhang
Micromachines 2024, 15(8), 937; https://doi.org/10.3390/mi15080937 - 23 Jul 2024
Viewed by 619
Abstract
HfNbTaTiZr high-entropy alloy has wide application prospects as a biomedical material, and the use of laser additive manufacturing can solve the forming problems faced by the alloy. In view of the characteristics of the one-time forming of additive manufacturing methods, it is necessary [...] Read more.
HfNbTaTiZr high-entropy alloy has wide application prospects as a biomedical material, and the use of laser additive manufacturing can solve the forming problems faced by the alloy. In view of the characteristics of the one-time forming of additive manufacturing methods, it is necessary to develop non-mechanical processing modification methods. In this paper, deep cryogenic treatment (DCT) is first applied to the modification of a HEA with BCC structure, then the post-processing method of DCT is combined with laser melting deposition (LMD) technology to successfully realize the coordinated improvement of forming and strength–ductility synergistic improvement in lightweight Hf0.25NbTa0.25TiZr alloy. The final tensile strength of the alloy after DCT treatment is 25% higher than that of the as-cast alloy and 11% higher than that of the as-deposited alloy, and the elongation is increased by 48% and 10%, respectively. In addition, DCT also achieves induced phase transition without additional deformation. Full article
(This article belongs to the Special Issue Advanced Additive Manufacturing Techniques: From Fundamental Research to Applications, 2nd Edition)
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