EBSD of Additively Manufactured Metals

A special issue of Metals (ISSN 2075-4701). This special issue belongs to the section "Additive Manufacturing".

Deadline for manuscript submissions: closed (30 November 2023) | Viewed by 4936

Special Issue Editors


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Guest Editor
EDAX, Draper, UT, USA
Interests: EBSD; Orientation Imaging Microscopy; texture analysis; X-Ray diffraction

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Guest Editor
Department of Metallurgical and Materials Engineering, Indian Institute of Technology, Chennai, India
Interests: materials processing; microstructure-mechanical properties correlations

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Guest Editor
University of Science and Technology Beijing, Beijing, China
Interests: neutron and synchrotron radiation technology; metal deformation; phase transformation; shape memory materials; high performance structural materials

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Guest Editor
School of Mechanical and Materials Engineering, Washington State University Pullman, Pullman, WA, USA
Interests: physical and mechanical metallurgy; metal deformation and recrystallization; grain boundary structure
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Special Issue Information

Dear Colleagues,

Additive manufacturing of metals has advanced considerably in the past decade, leading to the production of components from a wide spectrum of alloys and for a wide variety of applications. The local processing conditions under which a part is formed can have very dramatic effects on both the micro- and defect structures within the part. These structures will in turn affect the part’s properties, such as its mechanical behavior and fatigue resistance. Under multiple processing conditions, grain morphologies can be quite complex, and large strain gradients may develop in the microstructure due to rapid solidification. These strain gradients manifest in orientation gradients within grains. Electron backscatter diffraction (EBSD), as observed through scanning electron microscopes (SEM), can be used to capture complex grain structures, orientation gradients, and defect structures within the AM microstructure. Such information can improve our understanding of the effect of various processing parameters on the microstructural evolution of materials and provide critical insights for property prediction models. Microstructural control achievable via additive manufacturing has the unique capability of optimizing a given component’s microstructure by taking advantage of the inherent anisotropy in crystalline materials. The orientation information provided by EBSD is thus a critical variable in microstructural design.

Dr. Stuart Wright
Prof. Dr. Vadlamani Subramanya Sarma
Prof. Dr. Yandong Wang
Prof. Dr. David Field
Guest Editors

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Keywords

  • electron backscatter diffraction
  • EBSD
  • scanning electron microscope
  • SEM
  • additive manufacturing
  • AM microstructure

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Published Papers (2 papers)

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Research

12 pages, 55699 KiB  
Article
Effect of Heat Treatment on Microstructural Evolution in Additively Manufactured 316L Stainless Steel
by Wei-Yi Wang, Andrew Godfrey and Wei Liu
Metals 2023, 13(6), 1062; https://doi.org/10.3390/met13061062 - 1 Jun 2023
Cited by 7 | Viewed by 2455
Abstract
316L stainless steel samples were prepared by selective laser melting (SLM) and annealed at 1000 °C for durations of between 1 and 6 h to investigate both the kinetics of microstructural evolution during heat treatment and the effect of annealing on mechanical properties. [...] Read more.
316L stainless steel samples were prepared by selective laser melting (SLM) and annealed at 1000 °C for durations of between 1 and 6 h to investigate both the kinetics of microstructural evolution during heat treatment and the effect of annealing on mechanical properties. The as-printed materials contain a high density of oxide particles and dislocations, forming a dislocation cell substructure that shows high thermal stability during heat treatment. Moreover, coarsened oxide particles act as pinning barriers for moving dislocations and grain boundaries, thus extending the recovery and recrystallization process. The process of recrystallization can be effectively tracked by measuring the density of the low-angle misorientation boundaries associated with the oxide particles and dislocations, as characterized by high-resolution EBSD. The evolution of mechanical properties during annealing shows a strong relationship with the observed microstructural changes, suggesting possible optimization of strength and ductility of SLM-prepared metal samples by use of appropriate heat treatments. Full article
(This article belongs to the Special Issue EBSD of Additively Manufactured Metals)
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9 pages, 6832 KiB  
Communication
High Thermal Stability of a Colony and Basket-Weave Mixed Microstructure in Selective-Laser-Melted Ti-6Al-4V AlloyInduced by Electropulsing
by Lai Wei, Xiaofeng Xu, Yang Zhao, Xudong Yan, Yachong Zhou, Zhicheng Wu and Yongqiang Yu
Metals 2023, 13(3), 538; https://doi.org/10.3390/met13030538 - 7 Mar 2023
Cited by 1 | Viewed by 1567
Abstract
A colony and basket-weave mixed microstructure in the selective-laser-melted (SLM) Ti-6Al-4V alloy was introduced by electropulsing, which showed high thermal stability. The mechanism was investigated by electron backscatter diffraction (EBSD) and X-ray diffraction (XRD) analysis. It was found that the low content of [...] Read more.
A colony and basket-weave mixed microstructure in the selective-laser-melted (SLM) Ti-6Al-4V alloy was introduced by electropulsing, which showed high thermal stability. The mechanism was investigated by electron backscatter diffraction (EBSD) and X-ray diffraction (XRD) analysis. It was found that the low content of the β-phase favored the inhibition of microstructure coarsening. The increasing β-phases during the stabilization annealing (700 °C/16 h) rendered the growth of α-lath and -colony. Moreover, the stabilization-annealed colony and basket-weave mixed microstructure still kept the high strength–ductility synergy. Full article
(This article belongs to the Special Issue EBSD of Additively Manufactured Metals)
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