The measurement of melt pool width has proven to be critical in the development advanced control systems, defect detection algorithms and understanding influence parameter changes on build quality additive manufacturing processes. Parametric studies are performed new materials builds help identify optimal settings for final components. Many parametric iterations often required produce component...

Abstract The final part density in laser powder bed fusion is influenced by the particle size distribution. Too fine powders are not spreadable, and too coarse cause porosity. Powder blends, especially bimodal ones, can exhibit higher packing densities changes flowability compared to their monomodal constituents. These properties influence density. Therefore, of on was investigated. Two gas ato...

In order to improve the poor weldability and low quality of welded joints during welding magnesium alloys, a longitudinal magnetic field is introduced in process A-TIG with fixed frequency (30 Hz) current (1.5 A). Experimental analysis performed on effect microstructure mechanical properties under different TiO2 active agent coating amounts. The results show that grain size tends decrease then ...

Volumetrically significant melt production requires crustal temperatures above approximately 800 °C. At the grain scale, the former presence of melt may be inferred based on various microstructures, particularly pseudomorphs of melt pores and grain-boundary melt films. In residual migmatites and granulites, evidence of melt-extraction pathways at outcrop scale is recorded by crystallized produc...

In this work, the fundamental processing-structure-property (PSP) relationships that govern laser-based additive manufacturing were investigated with Ti-6Al-4V alloy. X-ray synchrotron imaging carried out in conjunction in-situ integrating sphere radiometry enabled real-time energy absorption measurements for a range of melting conditions varied laser power and velocity. A thermal conduction mo...

The successful synthesis of oxide-dispersion-strengthened (ODS) alloys via laser powder bed fusion (L-PBF) requires a better understanding the interaction oxide dispersoids with metallic melt pool. Here, ?/?’-strengthened Ni-8Cr-5.5Al-1Ti (wt%) model alloy is studied, as simplified version commercial CM247LC alloy, by melting pre-alloyed powders in which 0.5–1 wt% Y2O3 nanoparticles were added ...

To obtain a better joint quality in butt welding of aluminum, the gap filling process and quantification effects on molten pool characteristic bubble formation were realized by three-dimensional thermal-mechanistic-fluid coupled model, with consideration heat transfer, fluid flow, phase change recoil pressure. The model was validated synchrotron-radiation result. competition between solidificat...

The stress corrosion cracking (SCC) of 316L stainless steel manufactured by laser powder bed fusion (LPBF) was investigated slow strain rate tests in 6 wt% FeCl3. effects build orientation and surface roughness on the SCC LPBF were also investigated. LBPF revealed higher uniform elongation compared to wrought 316L. Specimens tested perpendicular direction showed a greater susceptibility SCC, wi...

We have investigated microstructural characteristics and solute Si element in the α-Al (fcc) matrix of Al-12%Si binary alloy additive-manufactured by laser powder bed fusion (L-PBF) process terms different locations melt-pool structure (inside or around boundaries). Their variations post heat-treatments at various temperatures were examined. The fraction phase lattice parameter quantified XRD m...