Powder bed binder jet 3D printing of Inconel 718: Densification, microstructural evolution and challenges☆

Nandwana, Peeyush; Elliott, Amy M.; Siddel, Derek; Merriman, Abbey; Peter, William H.; Babu, S. S.

doi:10.1016/j.cossms.2016.12.002

Cited by 176 publications

(74 citation statements)

References 40 publications

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“…Center‐notched rectangular panel specimens were fabricated on an ExOne Innovent binder jet 3D printer according to the design shown in Figure . In the binder jetting process, objects are built layer‐by‐layer by joining powder feedstock with an organic binder . First, a layer of powder material is dispensed from a hopper onto the build surface, then smoothed by a rotating drum known as the recoater.…”

Section: Methodsmentioning

confidence: 99%

In situ observations of cracking in constrained sintering

et al. 2018

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In this paper, we examine the long-standing problem of cracking during constrained sintering of a powder aggregate. Using binder jet 3D printing, we prepare ceramic green bodies in the form of center-notched panels, then use in situ imaging to observe how cracks nucleate and grow from the notch as the material sinters under restraint. Quantitative image analysis allows us to identify important characteristics of the sinter-cracking process, indicating a framework for analyzing the problem and developing methods for avoiding it, including representation of sinter-cracking as a creep crack growth process, use of fracture mechanics parameters to design specimen geometries that do not exceed critical stress intensities, and the possibility of exploiting the inherently ductile nature of sinter-cracking to mitigate damage. K E Y W O R D Sfracture, in situ imaging, sinter/sintering, solid freeform fabrication

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Section: Methodsmentioning

confidence: 99%

In situ observations of cracking in constrained sintering

et al. 2018

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“…The RTM ratio of this approach is ≈0.1 × 10 −3 m 2 min −1 . Binder jetting is commonly used for the production of metal or ceramic parts with highly complex geometries . While 3D printing has been synonymized colloquially with many AM techniques, the term should be used to describe binder jetting technologies that solidify a 2D pattern of powder‐based material in sequential layers to form a 3D object.…”

Section: Toolbox For Am Of Precision Biomaterialsmentioning

confidence: 99%

Additive Manufacturing of Precision Biomaterials

2019

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Biomaterials play a critical role in modern medicine as surgical guides, implants for tissue repair, and as drug delivery systems. The emerging paradigm of precision medicine exploits individual patient information to tailor clinical therapy. While the main focus of precision medicine to date is the design of improved pharmaceutical treatments based on “‐omics” data, the concept extends to all forms of customized medical care. This includes the design of precision biomaterials that are tailored to meet specific patient needs. Additive manufacturing (AM) enables free‐form manufacturing and mass customization, and is a critical enabling technology for the clinical implementation of precision biomaterials. Materials scientists and engineers can contribute to the realization of precision biomaterials by developing new AM technologies, synthesizing advanced (bio)materials for AM, and improving medical‐image‐based digital design. As the field matures, AM is poised to provide patient‐specific tissue and organ substitutes, reproducible microtissues for drug screening and disease modeling, personalized drug delivery systems, as well as customized medical devices.

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“…On average, the volume fraction of these phases decreases with increasing cooling rate in the melt pool and typically varies between ≈ 2 % and 20 % in experiments [63][64][65][66]. The size and distribution of the secondary phases precipitation in the matrix determine the tensile strength, fracture toughness, and fatigue properties of the solidified material [67]. A finer size and discrete distribution of those phases are beneficial compared to a coarser and continuous distribution, when resistance to deformation is considered [63][64][65][66].…”

Section: Precipitation Of Solid Phasesmentioning

confidence: 99%

Predictive modeling of solidification during laser additive manufacturing of nickel superalloys: recent developments, future directions

Ghosh

2018

Mater. Res. Express

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Additive manufacturing (AM) processes produce parts with improved physical, chemical, and mechanical properties compared to conventional manufacturing processes. In AM processes, intricate part geometries are produced from multicomponent alloy powder, in a layer-by-layer fashion with multipass laser melting, solidification, and solid-state phase transformations, in a shorter manufacturing time, with minimal surface finishing, and at a reasonable cost. However, there is an increasing need for post-processing of the manufactured parts via, for example, stress relieving heat treatment and hot isostatic pressing to achieve homogeneous microstructure and properties at all times. Solidification in an AM process controls the size, shape, and distribution of the grains, the growth morphology, the elemental segregation and precipitation, the subsequent solid-state phase changes, and ultimately the material properties. The critical issues in this process are linked with multiphysics (such as fluid flow and diffusion of heat and mass) and multiscale (lengths, times and temperature ranges) challenges that arise due to localized rapid heating and cooling during AM processing. The alloy chemistry-process-microstructure-propertyperformance correlation in this process will be increasingly better understood through multiscale modeling and simulation.

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Powder bed binder jet 3D printing of Inconel 718: Densification, microstructural evolution and challenges☆

Cited by 176 publications

References 40 publications

In situ observations of cracking in constrained sintering

In situ observations of cracking in constrained sintering

Additive Manufacturing of Precision Biomaterials

Predictive modeling of solidification during laser additive manufacturing of nickel superalloys: recent developments, future directions

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