Journal ArticleDOI
Columnar to equiaxed grain transition in as solidified alloys
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TLDR
In this article, the columnar to equiaxed transition (CET) in solidified alloys is considered and a review of the current level of understanding of the CET and current modelling capabilities are summarised and assessed.Abstract:
The generally reported observations pertinent to any proposed interpretation of the columnar to equiaxed transition (CET) in as solidified alloys are initially considered. The review then proceeds to consider the proposed mechanisms of equiaxed grain formation, the influence of alloy and processing conditions on the CET, criteria for the termination of columnar growth and, finally, deterministic/stochastic models for predicting the CET. In conclusion, the present level of understanding of the CET and current modelling capabilities are summarised and assessed.read more
Citations
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In situ tailoring microstructure in additively manufactured Ti-6Al-4V for superior mechanical performance
TL;DR: In this article, the lattice parameter of the β phase in the (α+β) lamellae falls into a specific range of 3.18-3.21 A. The lattice parameters can serve as an indicator to predict whether significant martensite decomposition has taken place in situ in Ti-6Al-4V made by SLM.
Journal ArticleDOI
Promoting the columnar to equiaxed transition and grain refinement of titanium alloys during additive manufacturing
TL;DR: In this article, the role of alloy constitution is explored in three classical alloy design regimes: an alloy containing no grain refiners (Ti 6Al 4V); an alloy only containing grain refining solutes (Ti 3Al 8V 6Cr 4Mo 4Zr); and an alloy including both grain refining and nucleant particles (Ti3Al 8v 6Cr4Mo 4zr+La2O3).
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.
Journal ArticleDOI
A synchrotron X-ray radiography study of dendrite fragmentation induced by a pulsed electromagnetic field in an Al–15Cu alloy
E. Liotti,A. Lui,Robin Vincent,S. Kumar,Zhipeng Guo,Thomas Connolley,I. P. Dolbnya,Michael Hart,Lars Arnberg,Ragnvald H. Mathiesen,Patrick S. Grant +10 more
TL;DR: An in situ technique for studying the effect of a pulsed electromagnetic field on dendrite fragmentation behavior based on synchrotron X-ray imaging has been developed, involving the passage of an oscillating current through a foil specimen placed in a static magnetic field as mentioned in this paper.
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Metal additive manufacturing: Technology, metallurgy and modelling
TL;DR: A comprehensive review of metal additive manufacturing can be found in this article, where the authors provide a complete picture of the current research on metal AM and its capabilities, along with a brief introduction to the complex physics behind the melt pool formation.
References
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Journal ArticleDOI
The redistribution of solute atoms during the solidification of metals
TL;DR: In this article, a quantitative analysis of the redistribution of solute resulting from solidification in the absence of convection of a binary solution for transient and steady state conditions is made, where diffusion in the liquid is taken into account and shown to be of importance in determining the solute distribution in both the liquid and the solid.
Journal ArticleDOI
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.
Journal ArticleDOI
Modelling of inoculation of metallic melts : Application to grain refinement of aluminium by Al-Ti-B
TL;DR: In this article, a numerical model is presented for the prediction of grain size in inoculated castings and is tested against measured grain sizes obtained in standard grain-refiner tests on aluminium alloys.
Journal ArticleDOI
Probabilistic modelling of microstructure formation in solidification processes
TL;DR: In this article, a new approach to the modelling of grain structure formation in solidification processes is proposed based upon a two-dimensional cellular automata technique, the model includes the mechanisms of heterogeneous nucleation and of grain growth.
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