Modeling of Ti-W Solidification Microstructures Under Additive Manufacturing Conditions

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2017-01-01
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Samimi, Peyman
Brice, David
Collins, Peter
Lesar, Richard
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Lesar, Richard
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Collins, Peter
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Materials Science and Engineering
Materials engineers create new materials and improve existing materials. Everything is limited by the materials that are used to produce it. Materials engineers understand the relationship between the properties of a material and its internal structure — from the macro level down to the atomic level. The better the materials, the better the end result — it’s as simple as that.
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Abstract

Additive manufacturing (AM) processes have many benefits for the fabrication of alloy parts, including the potential for greater microstructural control and targeted properties than traditional metallurgy processes. To accelerate utilization of this process to produce such parts, an effective computational modeling approach to identify the relationships between material and process parameters, microstructure, and part properties is essential. Development of such a model requires accounting for the many factors in play during this process, including laser absorption, material addition and melting, fluid flow, various modes of heat transport, and solidification. In this paper, we start with a more modest goal, to create a multiscale model for a specific AM process, Laser Engineered Net Shaping (LENS™), which couples a continuum-level description of a simplified beam melting problem (coupling heat absorption, heat transport, and fluid flow) with a Lattice Boltzmann-cellular automata (LB-CA) microscale model of combined fluid flow, solute transport, and solidification. We apply this model to a binary Ti-5.5 wt pct W alloy and compare calculated quantities, such as dendrite arm spacing, with experimental results reported in a companion paper.

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This article is published as Matt Rolchigo, Michael Mendoza Londono, Peyman Samimi, David Brice, Brian Martin, Peter Collins, and Richard LeSar , “Modeling of solidification in Ti-W alloys under additive manufacturing conditions”, Metallurgical and Materials Transactions A, 48(7), 3606-3622. doi:10.1007/s11661-017-4120-z. Posted with permission.

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Sun Jan 01 00:00:00 UTC 2017
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