A5080064913- Additive Manufacturing Materials and Processes
- Aluminum Alloy Microstructure Properties
- Solidification and crystal growth phenomena
- Welding Techniques and Residual Stresses
- Fluid Dynamics and Heat Transfer
- Microstructure and Mechanical Properties of Steels
- High Entropy Alloys Studies
- Magnetic Properties and Applications
- Additive Manufacturing and 3D Printing Technologies
- Microstructure and mechanical properties
- Metallurgical Processes and Thermodynamics
- Titanium Alloys Microstructure and Properties
- Metallurgy and Material Forming
- Fluid Dynamics Simulations and Interactions
- Advanced Welding Techniques Analysis
- Lattice Boltzmann Simulation Studies
- Pickering emulsions and particle stabilization
- Enhanced Oil Recovery Techniques
- Surfactants and Colloidal Systems
- Fluid Dynamics and Thin Films
- Geotechnical Engineering and Underground Structures
- Advanced materials and composites
- Particle Dynamics in Fluid Flows
- nanoparticles nucleation surface interactions
- Metallic Glasses and Amorphous Alloys
Ollscoil na Gaillimhe – University of Galway
2017-2024
I-Form Advanced Manufacturing Research Centre
2019-2024
Chinese Academy of Sciences
2002-2022
West China Hospital of Sichuan University
2021
Sichuan University
2021
University College Dublin
2007-2018
International Centre for Materials Physics
2013
Institute of Metal Research
2013
Imperial College London
2010
Hanalei Watershed Hui
2002
Internal flow behaviour during melt-pool-based metal manufacturing remains unclear and hinders progression to process optimisation. In this contribution, we present direct time-resolved imaging of melt pool dynamics from a high-energy synchrotron radiation experiment. We track internal streams arc welding steel measure instantaneous velocities ranging 0.1 m s-1 0.5 s-1. When the temperature-dependent surface tension coefficient is negative, bulk turbulence main mechanism critical velocity...
Laser beam Powder Bed Fusion (PBF-LB) is an increasingly attractive technology due to its capability of manufacturing complex and customised metal parts. However, the build cycle time resulting residual stress profiles are limiting a wider uptake PBF-LB manufacturing. The incorporation additional laser beams in single chamber, i.e. multi-laser (PBF-MLB) technology, has been proposed as next generation technology. A series computational process simulations PBF-MLB was carried out using 3D...
This paper presents the development of an integrated approach for microstructure prediction in laser beam powder bed fusion (PBF-LB) manufacturing Ti-6Al-4V, primarily focused on solidification morphology and solid-state phase transformation. A finite element (FE) model PBF-LB process is developed thermal history spatial distributions temperature. Based relationships between FE predicted history, gradient key parameters such as power scanning speed, additive (AM) map different morphologies,...
Additive manufacturing of Ti-6Al-4 V alloy via laser powder-bed fusion leads to non-equilibrium α′ martensitic microstructures, with high strength but poor ductility and toughness. These properties may be modified by heat treatments, whereby the phase decomposes into equilibrium α+β structures, while possibly conserving microstructural features length scales lath structure. Here, we combine experimental computational methods explore kinetics martensite decomposition. Experiments rely on...
The effects of Fe substitution for Ni on microstructure, phase transformations, magnetocaloric effect, and exchange-bias behavior the Ni46−xFexMn43Sn11 (x = 0–3) alloy ribbons have been investigated. free surface as-spun Fe-doped shows granular microstructure containing multiple shapes (the tree leaf-like, small columnar grain, etc.), while ordered grains are observed in fracture cross-section. martensitic structural transition temperature (TM) as-annealed decreases from 240 K x 0 to 185 3...
Smoothed particle hydrodynamics is employed, for the first time, to develop a numerical model melting and fluid flow during laser welding process. In this meshlessLagrangian method gas-melt two phase flow, heat transfer, surface tension, of solid parent material are considered. This was used study evolution temperature field in case spot 2D. The simulation results show strong influence process on liquid metal clear Marangoni transfer also found.
Laser beam powder bed fusion (PBF-LB) is a leading technique among metal additive manufacturing (AM), and it has wide range of applications in aerospace medical devices. Most the existing PBF-LB process modeling mainly based on fabrication single part large build plate, which not reflective practical multipart manufacturing. The effects batch size thermal mechanical behavior additively manufactured parts have been investigated. In this work, thermomechanical framework was proposed for first...
A key challenge for successful exploitation of additive manufacturing (AM) across a broad range industries is the development fundamental understanding relationships between process control and mechanical performance manufactured components. The present work focused on predictive methods process-structure-property AM. In particular, laser beam powder bed fusion (PBF-LB) identified as manufacture metallic AM Ti-6Al-4V alloy an important metal numerous high-performance applications, including...
Ti-24Nb-4Zr-8Sn (Ti2448) is a metastable β-type titanium alloy developed for biomedical applications. In this work, cylindrical samples of Ti2448 have been successfully manufactured by using the electron beam powder bed fusion (PBF-EB) technique. The thermal history and microstructure are characterised computational experimental methods. To analyse influence on materials, process PBF-EB has computationally predicted layer-by-layer modelling method. mainly includes β phase small amount α″...
Ab initio computational modeling, based on Density Functional Theory, was employed to predict the influence of metal ions Zn2+ and La3+ structural, electronic, photocatalytic properties anatase TiO2. Specifically, chemical modification TiO2 conducted by doping co-doping using these ions. Properties chemically modified were computationally predicted in terms lattice parameters, electronic band structure, density states, charge density, absorption spectrum. It found that significantly reduced...
The authors present an integrated meso-scale 2D numerical model for the simulation of laser spot welding a Fe-Cr-Ni steel. melting parent materials due to applied heating power is important phenomenon, leading formation weld pool and subsequent conditions from which solidification proceeds. This deals with dynamic whereby may be occurring at given location while has already commenced elsewhere throughout pool. Considering both possible simultaneous in this manner ensures more accurate...