In this work, we employ a combination of high-speed imaging and schlieren imaging, as well multiphysics modelling, to elucidate the effects interaction between laser beam powder bed. The formation denuded areas where was removed during single line island scans over several layers were imaged for first time. inclination plume shifted from forwards backwards by changing power scan speed, resulting in different denudation regimes with implications heat, mass momentum transfer process. As build...

High-speed imaging and schlieren were used to investigate the interaction of laser beam with powder bed at pressures up 5 bar, in argon helium atmospheres. The entrainment particles flow shielding gas generated by plume, hence denudation, was reduced high pressure for both gases. However, argon, increased temperature melt pool which significantly generation spatter ionisation metal vapour degraded surface smoothness continuity. For helium, formation plasma did not increase above that...

We report the design of a metal powder bed fusion system for in-situ monitoring build process during additive manufacture. Its open-architecture was originally determined to enable access x-rays melt pool, but it also provides area range other measurement techniques. The is sufficiently automated single tracks and high-density, multiple layer components be built. It easily transportable measurements at different facilities its modular enables straightforward modification specific being made....

The perceived advantages of laser powder bed fusion (PBF) at reduced pressure include a more stable melt pool and porosity. In this study, high-speed imaging was used to investigate the interaction beam with sub-atmospheric pressures. At atmospheric pressure, plume produces flow in ambient atmosphere that entrains particles toward pool. As decreases, hydrodynamic entrainment increases but eventually expansion prevents reaching pool: profiles cross-sections track reveal drastic reduction its...

IN738LC alloy has broad application potential in modern aerospace and energy industries due to its excellent high-temperature durability, corrosion fatigue resistance, however, been greatly limited high crack sensitivity. To address this challenge, research proposes a method of incorporating TiC nanoparticles mitigate cracks enhance the strength nickel-based materials. The crack-free TiC-IN738LC materials were successfully fabricated using laser-powder bed fusion. relationship between...

Environmental noise pollution is exacerbated by accelerated urbanization and different sources generate a unique sound spectrum. To address the aforementioned issue, triply periodic minimal surface acoustic absorbers were additively manufactured with three geometrical parameters (porosity, sample thickness, wall thickness) patterns to absorb across wide range of frequencies. TPMS made from Abs resin using VAT polymerization additive manufacturing (SLA) technology. The properties these...

Abstract Nickel-based alloys are known as non-weldable materials due to their complex characteristics. Consequently, additive manufacturing of these is particularly challenging. In this paper, the influence process parameters on porosity, crack formation and microstructure additively manufactured CM247LC nickel-based alloy analysed. The feasibility direct laser deposition (DLD) manufacture crack-free low-porosity samples studied. were built Inconel 718 that has similar chemical composition,...

Metal binder jetting is a potential mass-production additive manufacturing technique that enables faster production of complex structures with isotropic material properties. In metal jetting, the quality parts heavily influenced by powder characteristics, and even small variations in feedstock can result poor-quality parts. Powder management crucial this technology because processed high-humidity environment machine, mixed as well. paper, characteristics 316l 17-4PH stainless steel powders...

In this work, a numerical model is proposed to analyze the influence of particle–particle interaction in laser directed energy deposition or LMD (laser metal deposition) CM247 Ni-based superalloy. The based on analysis contact between particles and potential agglomeration powder predict conditions at nozzle exit. Simulation results were experimentally validated good agreement was observed. At exit mainly large (>100 µm) are found small ones (<10 tend flow away from region. This also observed...

This article investigates picosecond and sub-picosecond laser micromachining of Borofloat®33 glass provides clear evidence that a simple modification the beam scanning strategy can lead to significant improvement machining efficiency hence process throughput. Besides studying impact fundamental parameters, such as fluence, pulse overlap, repetition frequency (PRF), duration spot diameter, on machined depth, surface roughness material removal rate (MRR), it also compares results for two...

Abstract High-temperature alloys pose significant challenges in additive manufacturing. These materials have unique properties, such as high resistance to mechanical and chemical degradation when exposed temperatures. Furthermore, these are used produce hybrid components with other similar alloys, investigating their surface integrity is critical because any residual stress can lead early stage cracks poor fatigue performance. In this research, a manufacturing approach employed from...

Abstract The uniform thickness hollow axle is one of the lightest weight axles in high-speed rail industry. It can effectively reduce unsprung mass and further improve train speed. Therefore, due to its importance significance, it crucial research develop axle. To understand microstructural evolution during three-roll skew-rolling (TRSR) forming, 30CrMoA alloy steel was used this study. A constitutive model established by SIMUFACT FORMING finite element software utilized simulate...

Abstract The ceramic lattice filters are ideal for various technical applications, including filtration, flow stability, and heat transfer, that could alter the transport characteristics like pressure, permeability, velocity. authors presented a computational study based on fluid parameters four struts-based structures in this work. This includes seven designs of systematically created with 30 pores per inch (PPI) 80% porosity while varying unit cell sizes strut diameter. present has been...

Heat accumulation along the deposited layers in AM is an important issue that may lead to shape distortions. In this context, present paper aimed at analysing feasibility of interlayer post-processing depositions improve bonding and process performance. Concretely, use machining laser re-melting tested their effect on porosity, mechanical properties component distortion analysed. Additionally, results obtained after each technique were compared with as-deposited sample analyse benefits...

Abstract This study aims to compare the tensile behaviour of 3d printed resin and rice husk-reinforced resin-based gyroid lattice structures. The work was completed in two phases, firstly a structure with design configurations unit cell sizes (3, 4, 5, 6) solidity percentages (30, 40, 50) developed according ASTM638 (4) standard. 12 designs were manufactured using VAT polymerization additive manufacturing investigated for strength. In second phase, poorest testing results chosen develop...

Metal matrix composites have gained widespread adoption in various industries such as aerospace and deep-sea exploration owing to their exceptional multi-functional properties. The pursuit of fabricating high-quality composite materials has always been a promising endeavor. However, the application fields IN738LC greatly limited due its high crack sensitivity. To address this challenge, research proposes method incorporating TiC nanoparticles mitigate cracks enhance strength nickel-based...