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Differences in Defect Distribution Across Scan Strategies in Electron Beam AM Ti-6Al-4V : The fraction and size of pores present in EBM Ti-6Al-4V specimens varies depending on the melting strategy used, whether linear raster melting or point melting
(2021)
Quintana, María José
;
O’Donnell, Katie
;
Kenney, Matthew J.
;
Collins, Peter C.
In recent years, additive manufacturing (AM) has begun to displace traditional manufacturing techniques for specific applications. Notable benefits of AM include reduced times from design to product, an improved buy-tofly ratio, lower waste, and the ability to produce complex geometries[1,2]. An additional benefit of additive manufacturing is the variety of manufacturing processes that span across heat source (e.g., laser, electron beam, plasma), input material type (e.g., powder, wire), atmosphere, and the number of axes of control among others[2-4]. This variability in processing route means that a process can be identified and optimized for a class of products or parts. Despite these various advantages, one of the primary drawbacks of AM processes is porosity within builds, which ultimately reduces the ability of a part to withstand tensile stresses and can lead to premature failure[4-6]. Copyright 2021 ASM International.
Scopus© Citations 3 24 1
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Correction to: Texture Analysis of Additively Manufactured Ti-6Al-4V Deposited Using Different Scanning Strategies
(2020)
Quintana Hernández, María José
;
Kenney, Matthew J.
;
Agrawal, Priyanka
;
Collins, Peter C.
The following is missing from the Acknowledgments in the original article:
9 2
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Spherical pores as ‘microstructural informants’: Understanding compositional, thermal, and mechanical gyrations in additively manufactured Ti-6Al-4V
(2021)
Kenney, Matthew J.
;
O'Donnell, Katie
;
Quintana Hernández, María José
;
Collins, Peter C.
Detailed analysis of defects such as spherical porosity can act as informants, providing some information regarding the complex and often hidden physics associated with additive manufacturing. Variation in the presence and nature of these defects can shed new insights into the AM process. In this paper, the compositional, crystallographic, microstructural, and morphological characteristics surrounding gas pores in Electron Beam Melted Ti-6Al-4V have been assessed and correlated with different scanning strategies (raster and two point melting ones, Dehoff and random). The large spherical pores (>25μm), exclusively present in raster scan, exhibit perturbations normal to the vertical sidewalls of the pores that are likely the result of elastic instabilities resulting from chemical and crystallographic variations and initiated by vertical compression caused by thermal stresses related to the cyclic process – effectively a form of microbuckling. Electron backscatter diffraction maps support the theory that these perturbations occur at elevated temperatures and prior to the final solid-solid phase transformation. © 2021
Scopus© Citations 8 11 1
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Texture Analysis of Additively Manufactured Ti-6Al-4V Deposited Using Different Scanning Strategies
(2020)
Quintana Hernández, María José
;
Kenney, Matthew J.
;
Agrawal, Priyanka
;
Collins, Peter C.
A limited number of features that comprise the more wholistic materials state of electron beam, powder bed additively manufactured Ti-6Al-4V have been investigated. Coupling scanning electron microscopy and orientation microscopy, the microstructure and texture of samples produced using different AM scan strategies have been studied at various positions along the build height of the samples. Both the qualitative and quantitative results, including parent beta grain orientation, alpha lath texture, and predominant type of microstructure (colony vs basketweave), and their length scales are included. Both the scan strategy used for the build and the time between proximal molten pool passes have been shown to significantly influence the resulting microstructure and texture. © 2020, The Minerals, Metals & Materials Society and ASM International.
Scopus© Citations 9 15 1

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