Tailoring of Microstructures through Additive Manufacturing

A special issue of Crystals (ISSN 2073-4352). This special issue belongs to the section "Inorganic Crystalline Materials".

Deadline for manuscript submissions: 31 October 2024 | Viewed by 1368

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Guest Editor
Institute of Materials Science, School of Engineering and Design, Technical University of Munich, 85748 Garching b. München, Germany
Interests: metal additive manufacturing; functional graded materials; anisotropic material properties; microstructure to macroscopic properties relations
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Dear Colleagues,

Additive manufacturing (AM) is well known and respected for its capability to facilitate the fabrication of highly complex geometries, which have greatly enhanced the possibilities in lightweight designs. This, coupled with the opportunity to incorporate additional functionality, such as channels for cooling and/or lubrication, has led to a wide interest in these new technologies. However, that is not all that AM has to offer. Possibilities in new alloy design or regarding the local optimization of the microstructure to shape part properties and to enhance the performance on the material level were greatly overlooked in the past and are today slowly attracting the interest of the research community. Most AM technologies offer access to the microstructure, be it directly via the solidification pattern and the selection process in single-step AM processes such as powder-bed fusion (PBF) or direct energy deposition (DED), or via local alteration on the chemical composition level in multi-step AM processes such as material extrusion (MEX) or binder jetting (BJT). With this direct access to the local microstructure, and with it the local mechanical properties, new designs and an enhanced utilization of the material are possible, further allowing to shed weight and to cut down on the demand for raw materials.

Dr. Leonhard Hitzler
Guest Editor

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Keywords

  • sustainability
  • material design
  • lightweight construction
  • anisotropy
  • inhomogeneity

Published Papers (1 paper)

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Research

9 pages, 2476 KiB  
Article
Novel Approach to Grain Boundary Modification in Stainless and Duplex Steel L-PBF Components through In Situ Heat Treatment
by Mohsen Taheri Andani, Veera Sundararaghavan and Amit Misra
Crystals 2023, 13(9), 1314; https://doi.org/10.3390/cryst13091314 - 29 Aug 2023
Viewed by 1075
Abstract
Additive manufacturing (AM) has provided new possibilities for improving the grain boundary properties of metallic components. However, effectively modifying the microstructure, particularly the grain boundary properties, of laser powder bed fusion (L-PBF) components remains a challenge. Post-processing methods have shown some success in [...] Read more.
Additive manufacturing (AM) has provided new possibilities for improving the grain boundary properties of metallic components. However, effectively modifying the microstructure, particularly the grain boundary properties, of laser powder bed fusion (L-PBF) components remains a challenge. Post-processing methods have shown some success in adjusting grain boundary angles, but they have limitations when it comes to complex geometries and internal features. In this study, we propose an innovative in situ heat treatment to control the grain boundary properties of L-PBF components. A model is proposed to predict the thermal cycle at a single point, and it is validated through experiments on 2507 super duplex steel and 316L austenitic steel samples. The results demonstrate that, by applying controlled in situ heat treatment, the dynamic recovery processes can be influenced, and thereby the grain boundary properties of the manufactured parts can be controlled. This proposed method improves our understanding of the impact of in situ heat treatment on grain boundary properties and offers potential for designing and fabricating high-performance L-PBF components. The findings from this study lay the groundwork for the further exploration of grain boundary engineering in metallic components using L-PBF. By leveraging in situ heat treatment, future research can open up new avenues in additive manufacturing, facilitating the production of advanced and high-quality metallic components. Full article
(This article belongs to the Special Issue Tailoring of Microstructures through Additive Manufacturing)
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