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Showing papers in "Physics Procedia in 2016"


Journal ArticleDOI
TL;DR: In this paper, the effect of in-process preheating on microstructure, mechanical properties and residual stresses during selective laser melting (SLM) of H13 tool steel was analyzed.

199 citations


Journal ArticleDOI
TL;DR: In this paper, a wide range of process parameters were selected to optimize the process in terms of optimum volume density and the influence of processing parameters on the chemical composition of the selected alloy was determined.

187 citations


Journal ArticleDOI
TL;DR: In this paper, the porosity and microstructure of Ti6Al4V (ELI) material produced by Selective Laser Melting (SLM) under controlled oxygen content were analyzed.

118 citations


Journal ArticleDOI
TL;DR: In this paper, the authors discuss VEPP-4 activities relating to generation and application of synchrotron radiation not only for SR user community but for beam diagnostics in storage ring as well.

117 citations


Journal ArticleDOI
TL;DR: The principles of mainly used additive manufacturing processes of metals and their possibility to be integrated into a hybrid production machine are summarized and the combination with conventional manufacturing processes like sheet or bulk metal forming seems an effective solution.

107 citations


Journal ArticleDOI
TL;DR: In this article, the authors identify the current research findings and state of art of utilizing additive manufacturing in repair, refurbishment and remanufacturing processes of metallic products, and identify possibilities of AM in promotion of circular economy and expected environmental benefits based on the found literature.

105 citations


Journal ArticleDOI
TL;DR: In this article, direct metal deposition of an equimolar mixture of elemental powders was performed with a pulsed Nd:YAG laser and the microstructure of MoNbTaW was analyzed by back scattered electrons (BSE) and energy dispersive X-ray (EDX) spectroscopy in a scanning electron microscope.

95 citations


Journal ArticleDOI
TL;DR: In this article, a production process for laser metal deposition is presented, and used to repair a gas turbine burner of Inconel 718, where different parameters for defined track geometries were determined to attain a near net shape deposition with consistent build-up rate for changing wall thicknesses over the manufacturing process.

85 citations


Journal ArticleDOI
TL;DR: In this paper, a combined-powder approach using mixed powders is presented to process this historically difficult-to-process material, where dense parts without solidification cracking are produced by the SLM process, as verified using SEM and EDS.

77 citations


Journal ArticleDOI
TL;DR: In this paper, the impact of different scanning strategies, laser parameters and initial surface condition on the achieved surface finish is evaluated, and an in-depth investigation of CW laser polishing of titanium and cobalt chrome AM elements is presented.

70 citations


Journal ArticleDOI
TL;DR: In this paper, the SLM method was used to produce stainless steel powder 316L with a strong dependence on the parameters of powder melting and the direction of specimens building, and the results showed that the yield strength and tensile strength are higher than that of a stainless steel specimens obtained by traditional technology, and virtually independent of the directions of the specimens building.

Journal ArticleDOI
TL;DR: In this paper, the effect of graphitization treatment on phyisico-chemical properties of an activated carbon has been studied by means of multi-technical approach, involving inelastic neutron scattering and DRIFT spectroscopy.

Journal ArticleDOI
TL;DR: In this article, the D-Optimal Design of Experiments (DOE) approach is used for parameter optimization of laser power, scanning speed and hatch width of H13 tool steel.

Journal ArticleDOI
TL;DR: Inconel 718 samples were manufactured by SLM within the optimum process window regardless the process parameters whose origin has been directly related to the starting and finishing of the laser scanning tracks as mentioned in this paper.

Journal ArticleDOI
TL;DR: In this article, the effect of powder size and shape on the SLS processability and mechanical properties of a TPU elastomer was investigated, and the results showed that powder size was positively associated with SLS performance.

Journal ArticleDOI
TL;DR: In this article, a design approach using raw CT scan data is applied to the additive manufacturing (AM) manufacture of femoral prosthesis, where the mass of the prosthesis was rapidly designed and manufactured while satisfying the associated structural requirements.

Journal ArticleDOI
TL;DR: In this paper, the authors estimate the range of WC/Co ratio where cracking can be avoided using selective laser melting (SLM) to obtain continuous layers of remelted material on the surface of a hardmetal plate.

Journal ArticleDOI
TL;DR: In this paper, a new method and SLM machine for 3D multi-material parts production has been elaborated, and a new optical monitoring system has been elaborate for powder feeding to test object.

Journal ArticleDOI
TL;DR: In this article, some of the current scientific and technological aspects in this research field like hybrid laser arc welding, simulation techniques, utilization of electromagnetic fields or reduced pressure environment for laser beam welding processes, which contributed to the further development of this technology or will play a crucial role in its further industrial implementation.

Journal ArticleDOI
TL;DR: In this article, the problems of laser sintering of polymers are discussed using some examples, and the processing conditions as well as mechanical properties of a new polypropylene compound are shown considering also different laser Sintering machines.

Journal ArticleDOI
TL;DR: In this paper, high-speed direct laser deposition (HSDLD) is used to realize heterophase process during the manufacturing, which there is process takes place with a partial melting of powder.

Journal ArticleDOI
TL;DR: In this article, a comparison of the bead-on-plate welds between AM parts and sheet metal parts is done, and it is shown that laser welding is a suitable process for welding AM parts.


Journal ArticleDOI
TL;DR: In this article, the authors focused on the characterization and quantification of the intermetallic compounds (IMC) of the Al1050 and SF-Cu joints and precise weld criteria are developed.

Journal ArticleDOI
TL;DR: In this paper, the local beam oscillation in remote laser welding of aluminum to copper was investigated and the influence of the oscillation parameters frequency and amplitude on the weld geometry was investigated.

Journal ArticleDOI
TL;DR: In this paper, the specific removal rate of a 2-pulse burst was investigated on steel samples and it was shown that a maximum value was achieved when the applied peak fluence equals exp(2) times the threshold fluence.

Journal ArticleDOI
TL;DR: In this article, a review of diamond refractive lenses with high acceptance for transportation of radiation at high-power X-ray accelerator sources is presented, considering ways to improve the quality of surface and shape.

Journal ArticleDOI
TL;DR: In this paper, the authors investigated the hydrodynamic instability of the melt pool in conditions of high power laser action and material supply by gas-powder jet and developed a method to avoid instability in deposition process.

Journal ArticleDOI
TL;DR: In this article, the manufacturing and analysis of components made from filled polymer systems by means of selective laser sintering is investigated. But the results of the analysis are limited to the case of polyamides.

Journal ArticleDOI
TL;DR: In this article, a case study on identical ultrasonic transducers used for semiconductor wire bonding, assembled with either PZT8 or PZTs4 materials, is presented.