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Additive Manufacturing of Aerospace Materials

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

Deadline for manuscript submissions: 20 January 2025 | Viewed by 487

Special Issue Editors


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Guest Editor
College of Mechanical and Electrical Engineering, Central South University, Changsha, China
Interests: laser additive manufacturing
Department of Industrial and Systems Engineering, The Hong Kong Polytechnic University, Hong Kong, China
Interests: additive manufacturing
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Special Issue Information

Dear Colleagues,

Additive manufacturing, as an innovative technology, has gained the attention of many researchers. Due to its ability to produce components with a complex geometry that requires a limited amount of final finishing, reduces the lead time and material waste, and minimizes carbon footprints, this technology has proven to be beneficial in numerous industries such as aerospace, defense, medical, automobile, and, recently, nuclear. The aerospace sector has major application potential for this technology. However, there are still some obstacles to its wide application, such as cracks and coarse dendrites. These issues result in the low performance of additively manufactured components. Thus, new materials, new technology based on additive manufacturing, and new monitoring/control methods are needed. This Special Issue aims to integrate and present the latest advances to inspire and inform relevant researchers in the field of additive manufacturing with aerospace materials and to promote the application of additive manufacturing technology.

The topics of interest for this Special Issue include (but are not restricted to) the following:

  • New materials or materials modification for additive manufacturing.
  • New technology based on additive manufacturing for solving the issues with aerospace materials.
  • New monitoring and control methods to enhance the quality of additively manufactured components.

Dr. Guan Liu
Dr. Ze Pu
Guest Editors

Manuscript Submission Information

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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
  • aerospace materials
  • new technology
  • new monitoring/control method

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Published Papers (1 paper)

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Research

13 pages, 4524 KiB  
Article
Fatigue Strength Improvement of Laser-Directed Energy Deposition 316L Stainless Steel with In Situ Ultrasonic Rolling by Preliminary Investigation
by Guan Liu, Yigui Su, Xuyu Pi, Defu Liu and Yongcheng Lin
Materials 2024, 17(15), 3693; https://doi.org/10.3390/ma17153693 - 26 Jul 2024
Viewed by 369
Abstract
In this study, to improve the fatigue strength of the LDED (laser-directed energy deposition) 316L stainless steel, an in situ ultrasonic rolling technology is developed to assist the laser-directed energy deposition process (LDED-UR). The microstructural characteristics and fatigue behavior are comprehensively discussed. The [...] Read more.
In this study, to improve the fatigue strength of the LDED (laser-directed energy deposition) 316L stainless steel, an in situ ultrasonic rolling technology is developed to assist the laser-directed energy deposition process (LDED-UR). The microstructural characteristics and fatigue behavior are comprehensively discussed. The results show that the average size of pores of the LDED-UR alloy is about 10.2 μm, which is much smaller than that of the LDED alloy (34.1 μm). Meanwhile, the density of the LDED alloy is also enhanced from 98.26% to 99.27% via the in situ ultrasonic rolling. With the application of the in situ ultrasonic rolling, the grains are transformed into fully equiaxed grains, and their average grain size is greatly reduced from 84.56 μm to 26.93 μm. The fatigue limit of the LDED-UR alloy is increased by 29% from 210 MPa (LDED alloy) to 270 MPa, which can be ascribed to the decreased porosity and the fine grains. In particular, the crack initiation site of the LDED alloy is located at the surfaces, while it is nucleated from the sub-surface for the LDED-UR alloy. This is mainly attributed to the compression residual stress induced by the in situ ultrasonic rolling. This research offers a valuable understanding of the failure mechanisms in additively manufactured metals, guiding the development of effective strategies to improve their fatigue threshold under severe operating conditions. Full article
(This article belongs to the Special Issue Additive Manufacturing of Aerospace Materials)
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