Journal ArticleDOI
The effect of location on the microstructure and mechanical properties of titanium aluminides produced by additive layer manufacturing using in-situ alloying and gas tungsten arc welding
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In this article, the additive layer manufacturing (ALM) process is used to produce full density titanium aluminide components directly using the new additive layer additive manufacturing method, and the microstructure variation and strengthening mechanisms resulting from the new manufacturing approach are analysed in detail.Abstract:
An innovative and low cost additive layer manufacturing (ALM) process is used to produce γ-TiAl based alloy wall components. Gas tungsten arc welding (GTAW) provides the heat source for this new approach, combined with in-situ alloying through separate feeding of commercially pure Ti and Al wires into the weld pool. This paper investigates the morphology, microstructure and mechanical properties of the additively manufactured TiAl material, and how these are affected by the location within the manufactured component. The typical additively layer manufactured morphology exhibits epitaxial growth of columnar grains and several layer bands. The fabricated γ-TiAl based alloy consists of comparatively large α 2 grains in the near-substrate region, fully lamellar colonies with various sizes and interdendritic γ structure in the intermediate layer bands, followed by fine dendrites and interdendritic γ phases in the top region. Microhardness measurements and tensile testing results indicated relatively homogeneous mechanical characteristics throughout the deposited material. The exception to this homogeneity occurs in the near-substrate region immediately adjacent to the pure Ti substrate used in these experiments, where the alloying process is not as well controlled as in the higher regions. The tensile properties are also different for the vertical (build) direction and horizontal (travel) direction because of the differing microstructure in each direction. The microstructure variation and strengthening mechanisms resulting from the new manufacturing approach are analysed in detail. The results demonstrate the potential to produce full density titanium aluminide components directly using the new additive layer manufacturing method.read more
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Journal ArticleDOI
Additive manufacturing of metallic components – Process, structure and properties
Tarasankar Debroy,Huiliang Wei,J.S. Zuback,T. Mukherjee,John W. Elmer,John O. Milewski,Allison M. Beese,Alexander E. Wilson-Heid,Amitava De,Wei Zhang +9 more
TL;DR: A review of the emerging research on additive manufacturing of metallic materials is provided in this article, which provides a comprehensive overview of the physical processes and the underlying science of metallurgical structure and properties of the deposited parts.
Journal ArticleDOI
Metal Additive Manufacturing: A Review of Mechanical Properties
John J. Lewandowski,Mohsen Seifi +1 more
TL;DR: A review of published data on the mechanical properties of additively manufactured metallic materials can be found in this paper, where the additive manufacturing techniques utilized to generate samples covered in this review include powder bed fusion (eBM, SLM, DMLS) and directed energy deposition (eBF3).
Journal ArticleDOI
Wire-feed additive manufacturing of metal components: technologies, developments and future interests
TL;DR: In this paper, an in depth review of various process aspects of wire-feed additive manufacturing, including quality and accuracy of wirefeed AM processed components, is presented, and the overall objective is to identify the current challenges for wire feed additive manufacturing as well as point out the future research direction.
Journal ArticleDOI
Progress in additive manufacturing on new materials: A review
TL;DR: In this article, a review of recent efforts and advances in additive manufacturing (AM) on different types of new materials is presented and reviewed, focusing on the material design of cladding layers, the choice of feedstock materials, the metallurgical behavior and synthesis principle during the AM process, and the resulted microstructures and properties, as well as the relationship between these factors.
Journal ArticleDOI
Microstructural Control of Additively Manufactured Metallic Materials
TL;DR: In additively manufactured (AM) metallic materials, the fundamental interrelationships that exist between composition, processing, and microstructure govern these materials' properties and potential improvements or reductions in performance.
References
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Journal ArticleDOI
Additive manufactured AlSi10Mg samples using Selective Laser Melting (SLM): Microstructure, high cycle fatigue, and fracture behavior
TL;DR: In this paper, the microstructure, high cycle fatigue (HCF), and fracture behavior of additive manufactured AlSi10Mg samples are investigated, and the results were analyzed statistically by design of experiments, correlation analysis, and marginal means plots.
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Review of alloy and process development of TiAl alloys
TL;DR: The improved understanding of the factors that control microstructure and properties of TiAl alloys is reviewed together with current work aimed at developing both wrought and cast products in this paper.
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Design, Processing, Microstructure, Properties, and Applications of Advanced Intermetallic TiAl Alloys†
Helmut Clemens,Svea Mayer +1 more
TL;DR: In this article, a general survey of engineering γ-TiAl based alloys is given, but concentrates on β-solidifying alloys which show excellent hot-workability and balanced mechanical properties when subjected to adapted heat treatments.
Journal ArticleDOI
Selective laser melting of aluminium components
TL;DR: In this article, two MCP Realizer machines were used to process 6061 and AlSi12 alloys, one processing at 50 W and the other at 100 W laser power.
Journal ArticleDOI
Microstructure and deformation of two-phase γ-titanium aluminides
TL;DR: In this paper, the current knowledge on dislocation types and slip systems, the development of deformation substructures, factors controlling the mobility and multiplication of dislocations, interface related plasticity, solid solution and precipitate strengthening mechanisms as well as microscopic aspects of creep and fracture are addressed.