Chunlei Qiu

TL;DR: In this paper, the development of surface structure and porosity of Ti-6Al-4V samples fabricated by selective laser melting under different laser scanning speeds and powder layer thicknesses has been studied and correlated with the melt flow behavior through both experimental and modelling approaches.

TL;DR: In this article, the tensile properties measured before and after HIPing were analyzed using optical microscopy, scanning electron microscopy (SEM) and X-ray diffraction (XRD).

TL;DR: In this article, the as-fabricated strut size, morphology and internal porosity were investigated using optical microscopy, scanning electron microscopy (SEM) and X-ray microtomography (micro-CT) and correlated to the compressive properties of the structure.

TL;DR: In this article, it was found that a high laser power together with a reasonably low powder feed rate was essential for achieving minimum porosity, and that the build height and geometrical integrity of samples were sensitive to the specified laser nozzle moving step along the specified build height direction (or Z step) with a too big Z step usually leading to a build height smaller than specified height (or under build) and a too small Z step to excessive building (or excess build).

TL;DR: In this paper, an integrated computational materials science approach for selective laser melting (SLM) at the mesoscale is presented a particle dropping model was developed to simulate the representative powder-bed particle distribution of a measured titanium alloy powder Thermal fluid flow and resulting microstructural evolution of a set of laser scanned single tracks with different powder layer thicknesses and scanning speeds were also studied using both computational and experimental approaches.