Journal ArticleDOI
Localized melt-scan strategy for site specific control of grain size and primary dendrite arm spacing in electron beam additive manufacturing
Narendran Raghavan,Srdjan Simunovic,Ryan R. Dehoff,Alex Plotkowski,John A. Turner,Michael M. Kirka,Suresh Babu +6 more
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TLDR
In this paper, a new melt-scan strategy for inducing site specific, on-demand control of solidification microstructure was developed to induce variations in grain size and primary dendrite arm spacing in Inconel 718 parts produced by the electron beam additive manufacturing system.About:
This article is published in Acta Materialia.The article was published on 2017-11-01. It has received 149 citations till now. The article focuses on the topics: Grain size & Electron-beam additive manufacturing.read more
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Revisiting fundamental welding concepts to improve additive manufacturing: From theory to practice
TL;DR: In this article, a unified equation to compute the energy density is proposed to compare works performed with distinct equipment and experimental conditions, covering the major process parameters: power, travel speed, heat source dimension, hatch distance, deposited layer thickness and material grain size.
Journal ArticleDOI
Mechanistic models for additive manufacturing of metallic components
TL;DR: In this article, the authors focus on the available mechanistic models of additive manufacturing (AM) that have been adequately validated and evaluate the functionality of AM models in understanding of the printability of commonly used AM alloys and the fabrication of functionally graded alloys.
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Metallurgy, mechanistic models and machine learning in metal printing
TL;DR: In this paper, the authors examined advances in metal printing focusing on metallurgy, as well as the use of mechanistic models and machine learning and the role they play in the expansion of the additive manufacturing of metals.
Journal ArticleDOI
Powder Bed Fusion of nickel-based superalloys: A review
Salomé Sanchez,Peter Smith,Zhengkai Xu,Gabriele Gaspard,Gabriele Gaspard,Christopher J. Hyde,Wessel W. Wits,Ian Ashcroft,Hao Chen,Adam T. Clare +9 more
TL;DR: A comprehensive review of the microstructure and mechanical properties of nickel-based superalloys, manufactured using the two principle PBF techniques: Laser Powder Bed Fusion (LPBF) and Electron Beam Melting (EBM) is presented in this article.
Journal ArticleDOI
Atomic-scale grain boundary engineering to overcome hot-cracking in additively-manufactured superalloys
Paraskevas Kontis,Edouard Chauvet,Zirong Peng,Junyang He,Alisson Kwiatkowski da Silva,Dierk Raabe,Catherine Tassin,Jean-Jacques Blandin,Stéphane Abed,Rémy Dendievel,Baptiste Gault,Baptiste Gault,Guilhem Martin +12 more
TL;DR: In this article, a near-atomic-scale approach was used to investigate the details of the compositional decoration of grain boundaries in the coarse-grained, columnar microstructure in parts built from a non-weldable nickel-based superalloy by selective electron-beam melting.
References
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Journal ArticleDOI
Nickel-Based Superalloys for Advanced Turbine Engines: Chemistry, Microstructure and Properties
Tresa M. Pollock,Sammy Tin +1 more
TL;DR: The chemical, physical, and mechanical characteristics of nickel-based superalloys are reviewed with emphasis on the use of this class of materials within turbine engines as mentioned in this paper, and the role of major and minor alloying additions in multicomponent commercial cast and wrought super-alloys is discussed.
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A Review of Additive Manufacturing
Kaufui V. Wong,Aldo Hernandez +1 more
TL;DR: Additive manufacturing processes take the information from a computer-aided design (CAD) file that is later converted to a stereolithography (STL) file as discussed by the authors.
Journal ArticleDOI
Formation of Crystal Nuclei in Liquid Metals
TL;DR: In this paper, the authors calculated the interfacial energies between crystal nuclei and the corresponding liquids from nucleation frequencies of small droplets on the basis of homogeneous nucleation.
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Metal Fabrication by Additive Manufacturing Using Laser and Electron Beam Melting Technologies
Lawrence E Murr,Sara M. Gaytan,D. A. Ramirez,E. Martinez,Jennifer Hernandez,Krista Amato,P. W. Shindo,Francisco Medina,Ryan B. Wicker +8 more
TL;DR: In this paper, a comparative study of selective laser melting (SLM) and electron beam melting (EBM) is presented for the fabrication of complex, multi-functional metal or alloy monoliths by CAD-directed, selective melting of precursor powder beds.
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Steady state columnar and equiaxed growth of dendrites and eutectic
TL;DR: In this article, an analysis for the growth of equiaxed grains ahead of the columnar front during directional solidification is presented, and the model considers both single-phase and eutectic growth.