Recent Advances in Metal Processing and Manufacturing: Technique, Method, Performance, and Microstructure

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

Deadline for manuscript submissions: 25 November 2024 | Viewed by 1300

Special Issue Editor

School of Mechanical and Electrical Engineering, China University of Mining and Technology, Xuzhou 221116, China
Interests: metal additive manufacturing; gradient structure; Mg alloy; Ti alloy; steel

Special Issue Information

Dear Colleagues,

In recent years, with the popularity and application of additive manufacturing technology (commonly known as 3D printing technology), metal additive manufacturing technology has begun to gain traction in the manufacturing field and has rapidly developed into one of the most promising advanced manufacturing technologies in the 3D printing field. At present, metal parts formed by metal additive manufacturing technology are gradually being used in aerospace, medical equipment, automobile manufacturing, and other fields.

Metal additive manufacturing is a process that uses fine, metal powders to create strong, complex components that are designed either by using a computer-aided design (CAD) program or by taking a 3D scan of the object. It offers the possibility to produce complex parts without the design constraints of traditional manufacturing routes.

This Special Issue kindly invites researchers from the aforementioned fields to present new theoretical or experimental results and recent advancements in the form of research articles and reviews.

Dr. Jing Han
Guest Editor

Manuscript Submission Information

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Keywords

  • metal additive manufacturing
  • gradient structure
  • Mg alloy
  • Ti alloy
  • steel

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Published Papers (1 paper)

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Research

21 pages, 30210 KiB  
Article
On the Mechanical Behavior of LP-DED C103 Thin-Wall Structures
by Brandon Colón, Mehrdad Pourjam, Gabriel Demeneghi, Kavan Hazeli, Omar Mireles and Francisco Medina
Metals 2024, 14(9), 958; https://doi.org/10.3390/met14090958 - 23 Aug 2024
Viewed by 828
Abstract
Laser Powder Directed Energy Deposition (LP-DED) can produce thin-wall features on the order of 1 mm. These features are essential for large structures operating in extreme environments such as regeneratively cooled nozzles and heat exchangers, which often make use of refractory metals. In [...] Read more.
Laser Powder Directed Energy Deposition (LP-DED) can produce thin-wall features on the order of 1 mm. These features are essential for large structures operating in extreme environments such as regeneratively cooled nozzles and heat exchangers, which often make use of refractory metals. In this work, the mechanical behavior of LP-DED C103 was investigated via quasi-static tensile testing and low cycle fatigue (LCF) testing. The effects of vacuum stress relief (SR) and hot isostatic pressing (HIP) heat treatments were investigated for specimens in the vertical and horizontal build orientations during tensile testing. The AB and SR properties were lower than literature values for wrought and laser powder bed fusion (L-PBF) bulk components but higher than electron beam powder bed fusion (EB-PBF). The application of a HIP cycle improved strength by 7% and ductility by 27% past the initial as-built condition. Fracture images reveal that interlayer stress concentration sites are responsible for fracture in specimens in the vertical orientation. Meanwhile, fracture in the horizontal specimens mainly propagates at a slanted angle typical of plane stress conditions. The LCF results show cycles to failure ranging from 100 cycles to 8000 cycles for max strain levels of 2% and 0.5%, respectively. Fractography on the fatigue specimens reveals an increasing propagation zone as max strain levels are increased. The impact of these findings and future work are discussed in detail. Full article
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