Journal ArticleDOI
Electron Beam Additive Manufacturing of Titanium Components: Properties and Performance
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TLDR
In this paper, the fatigue properties of Ti-6Al-4V specimens and components produced by Electron Beam additive manufacturing were evaluated and it was found that the fatigue performance of specimens produced by additive manufacturing is significantly lower than that of wrought material due to defects such as porosity and surface roughness.Abstract:
This research evaluates the fatigue properties of Ti-6Al-4V specimens and componentsproduced by Electron Beam additive manufacturing. It was found that the fatigue per-formance of specimens produced by additive manufacturing is significantly lower thanthat of wrought material due to defects such as porosity and surface roughness. However,evaluation of an actual component subjected to design fatigue loads did not result in pre-mature failure as anticipated by specimen testing. Metallography, residual stress, staticstrength and elongation, fracture toughness, crack growth, and the effect of post process-ing operations such as machining and peening on fatigue performance were alsoevaluated. [DOI: 10.1115/1.4025773]Keywords: additive manufacturing, electron beam, titanium, fatigue, fractureread more
Citations
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Journal ArticleDOI
Comparative analysis of different lattice topologies for cellular structure optimization in additive manufacturing
TL;DR: In this paper , a cylindrical component was designed and then different lattice topologies like grid, vin tile and hexagon were used to create the internal cellular structure, and a comparative analysis was carried out on these cellular structures based on different unit cell sizes, variable strut thickness, coefficient of volume reduction (VRC) and surface area coefficient (SAC).
Dissertation
Mechanical and Fatigue Testing of Rapid Prototyped Aerospace Titanium Component by Electron Beam Melting Process
TL;DR: In this article, the mechanical and fatigue behavior of a Ti-6Al-4V structural component that was manufactured by electron beam melting (EBM) was studied and the results indicated that the EBM component did not fail before the fasteners in both tests.
Statistical process monitoring and control methods for in-situ detection and localization of defects in laser powder bed fusion
Abstract: Key industrial sectors for the implementation of metal additive manufacturing (AM) systems, like aerospace and bio-medical industries, involve stringent quality and certification requirements that are difficult to meet at the current technological maturity level. One major barrier is represented by the limited stability and repeatability of the AM processes. This motivates the development of in-situ monitoring and control solutions for a zero-defect oriented production. Most efforts in the literature and in industry have been focused on gathering in-situ sensor data so far, but what is still lacking is the availability of data analytics tools able to make sense of big amounts of acquired signals and yield automated defect detection and localization capabilities. Automated alarm rules represent a first necessary step to design novel closed-loop control strategies for defect mitigation or even defect repair methods that are still not available in commercial systems. In this framework, we present statistical image-based methods for in-situ monitoring of various kinds of “process signatures” aimed at characterizing the melting state and detecting local defects during the layer-wise production of the part. The proposed methodologies are applied to real case studies in Selective Laser Melting (SLM). Additive Manufacturing, Laser Powder Bed Fusion, in-situ monitoring, zero-defect, image analysis
Evaluation of cumulative fatigue damage rules and application to additive manufactured (AM) materials
TL;DR: Acknowledgements and acknowledgements are given in this paper, where a list of tables and lists of figures are presented. But they do not include any lists of symbols and symbols.
References
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Journal ArticleDOI
A study of the microstructural evolution during selective laser melting of Ti–6Al–4V
TL;DR: In this article, the development of the microstructure of the Ti-6Al-4V alloy processed by selective laser melting (SLM) was studied by light optical microscopy.
Journal ArticleDOI
Residual stresses in selective laser sintering and selective laser melting
Peter Mercelis,Jean-Pierre Kruth +1 more
TL;DR: In this paper, a simple theoretical model is developed to predict residual stress distributions in selective laser sintering (SLS) and selective laser melting (SLM), aiming at a better understanding of this phenomenon.
Journal ArticleDOI
Progress in Additive Manufacturing and Rapid Prototyping
TL;DR: Rapid prototyping generally refers to techniques that produce shaped parts by gradual creation or addition of solid material, therein differing fundamentally from forming and material removal manufacturing techniques as mentioned in this paper. But it is not suitable for all applications.
Journal ArticleDOI
Rapid manufacturing and rapid tooling with layer manufacturing (lm) technologies, state of the art and future perspectives
TL;DR: In this article, a systematic material dependent classification of layer manufacturing and process oriented metal part manufacturing techniques are proposed, mainly for metallic parts, polymer parts and tooling, and the generic and the major specific process characteristics and materials are described.
Journal ArticleDOI
On the mechanical behaviour of titanium alloy TiAl6V4 manufactured by selective laser melting: Fatigue resistance and crack growth performance
Stefan Leuders,M. Thöne,Andre Riemer,Thomas Niendorf,Thomas Tröster,Hans Albert Richard,Hans Jürgen Maier +6 more
TL;DR: In this article, the microstructure-defect-property relationship under cyclic loading for a TiAl6V4 alloy processed by selective laser melting is investigated. And the results show that the micron sized pores mainly affect fatigue strength, while residual stresses have a strong impact on fatigue crack growth.