Laser powder bed fusion (LPBF) is an attractive technology of manufacturing high-strength aluminium alloy parts for the aircraft and automobile industries, limited by poor processability these alloys. This work was aimed at finding process window LPBF defect-free components AA7075 alloy. Optimization parameters performed each stage multi-stage research, i.e. single tracks, thin walls volumetric specimens. At stage, relation between defect formation with a focus on hot cracking investigated...

Abstract Selective Laser Melting (SLM) of magnesium alloys is the technology undergoing dynamic development in many research centres. The results are promising and make it possible to manufacture defect-free material with better properties than those offered by manufacturing technologies used date. This review aims evaluate present state as well main challenges using Powder Bed Fusion (L-PBF) for processing an alternative way conventional parts aerospace industry. literature first one...

The paper presents results of studies on Selective Laser Melting. SLM is an additive manufacturing technology which may be used to process almost all metallic materials in the form powder. Types energy emission sources, mainly fiber lasers and/or Nd:YAG laser with similar characteristics and wavelength 1,06 - 1,08 microns, are provided primarily for processing powder high absorption radiation. selected variable parameters (laser power, scanning time, strategy) fixed such as protective...

Standard experimental research works are aimed at optimization of Selective Laser Melting (SLM) parameters in order to produce material with relative density over 99% and possibly the highest scanning speed. Typically, cuboidal specimens arbitrarily selected dimensions built. An optimum set parameters, determined on such specimens, is used for building parts variable cross-section areas. However, it gives no guarantee that variable-section produced so will be as high measured during process....

In this paper, a detailed assessment of Inconel 718 powder, with varying degrees degradation due to repeated use in the Laser Powder Bed Fusion (LPBF) process, has been undertaken. Four states IN718 powder (virgin, used, overflow and spatter) were characterized terms their morphology, flowability physico-chemical properties. Studies showed that used powders almost identical. The fine particle-size distribution virgin which 50% particles found be below nominal (PSD), was recognized as main...

In this article, the authors discuss results of studies into processing Ti-5Al-5Mo-5V-1Cr-1Fe near-β titanium alloy (Ti-55511) by electron beam melting (EBM), an additive manufacturing technique. Due to its high flexibility in shaping mechanical properties, Ti-55511 is commonly used aircraft components such as landing gear or airframes. study, powder was and properties were described regards chemical composition particle size distribution order assess suitability for EBM repeatability...

Purpose This paper aims to discuss the results of material tests conducted on specimens manufactured from AZ31 alloy powder by selective laser melting (SLM) technology. The were then subjected porosity assessment, microstructure analysis as well mechanical and corrosion tests. Design/methodology/approach SLM process was optimized using design experiments tools. Experiments aimed at selecting optimum parameters carried out in accordance with a five-level rotatable central composite design....

Additive manufacturing (AM) is dynamically developing and finding applications in different industries. The quality of input material a part the process final product quality. That why understanding influence powder reuse on properties bulk specimens crucial for ensuring repeatable AM chain. presented study investigated possibility continuous AlSi7Mg0.6 laser bed fusion (LPBF). To date, there no LPBF to be found literature. This aims respond this gap. five batches samples series were...

Abstract One of the main limitations additive manufacturing (AM) technologies consists in relatively low build rate. Low productivity discourages companies from investing AM machines, thus limiting market technologies. Machine manufacturers have introduced new solutions to their designs increase rate, some them are described this paper. However, design improvements not only method accelerate process. The paper specifies factors that influence rate laser powder bed fusion process and provides...

Abstract In this study, the effect of rhenium addition (2, 4, and 6 wt pct) building orientation (0 90 deg) on microstructure corrosion resistance Inconel 718 (IN718) alloy processed by selective laser melting (SLM) was investigated. Microstructure characterization showed that as-built IN718-Re alloys consist columnar grains growing parallel to direction ( Z -axis). Each grain characterized a fine columnar/cellular dendritic substructure with Nb- Mo-rich Laves phases MC-type carbides...

Laser powder bed fusion (LPBF) enables additive manufacturing (AM) of complex three-dimensional objects. Inconel 718 is a widely used aerospace material and that has been well adopted for the LPBF process. However, when geometrically parts in industry, some aspects processes still require optimisation. This because high residual stresses arise during process, which remain within part, turn affecting its geometric accuracy. Therefore, paper presents results multicriteria evaluation accuracy...

Graphene, a two-dimensional structure of carbon, due to its has unique physico-chemical properties that can be used in numerous research and industry areas. Although this is already well known, there are still technological (and cost) barriers which do not allow produce material large quantities hence prevent use various applications. For reason, many technologies currently being developed obtain graphene forms would enable widespread use. The graphene-like ceramics were fabricated by the...

The effect of electron-beam melting (EBM) and selective laser (SLM) processes on the chemical composition, phase density, microstructure, microhardness as-built Ti55511 blocks were evaluated compared. work also aimed to understand how each process setting affects powder characteristics after processing. Experiments have shown that both methods can successfully build parts with almost full density (>99%) without any internal cracks or delamination. It was observed SLM sample retain...

Selective laser melting (SLM) is an additive manufacturing process that enables novel alloy production by combining metals with significantly different physical properties. In this paper, the hot corrosion behavior of Ti–Re alloys fabricated SLM was studied in a mixture Na2SO4 and NaCl salts at 600 °C. The morphology composition products were characterized scanning electron microscopy energy-dispersive X-ray spectroscopy diffraction to understand degradation mechanisms. It has been shown...

This paper presents the results of research on ballistic panels made polymer-matrix composites (PMCs). The analysis covers two types produced by authors based high-density polyethylene (PEHD) and polypropylene (PP) reinforced with aramid fabric. Ballistic tests were carried out use projectile: 0.38 Special, 9 × 19 Parabellum, which are characterized different velocity projectile energy. study X-ray computed tomography (XCT) for structure assessment its impact behavior, further compared to...