Showing papers in "Journal of Materials Processing Technology in 2015"

TL;DR: In this paper, a double optimization procedure of the process parameters is used to obtain a high quality material: firstly, the optimization of the initial process parameters for the minimization of inherent defects, and secondly, the optimisation of the further thermomechanical treatment to minimize internal stresses and adjust the microstructure.

TL;DR: In this article, the hydrogen porosity in AlSi10Mg parts built up with selective laser melting (SLM) can be lowered by efficient drying of the powder as well as by the modification of the process parameters.

TL;DR: A comprehensive review of surface composites via friction stir processing is presented in this article, where the underlying mechanisms in strengthening of FSP-processed surface composite are discussed with reported models.

TL;DR: In this paper, the accumulation of distortion during additive manufacturing (AM) of titanium and nickel base alloys is made as a function of changes in dwell time between the deposition of individual layers.

TL;DR: In this article, an analysis of the balling mechanism reveals that melting is a process where melt spreading and solidification compete with each other and the final result is determined by intrinsic tungsten properties and the set laser processing parameters, and it was observed that balling of melted droplets at the laser focal points and entrapped cavities hindered the preparation of fully dense parts.

TL;DR: In this paper, the microstructural evolution of a typical bead is observed to begin with columnar dendrites, at the clad-substrate interface, growing vertically to the substrate.

TL;DR: In this paper, laser surface texturing was applied to texture the rake face of the cutting tool with different textures (dimples and channels) to allow for changing the adhesion tendency of built-up edge (BUE) structures.

TL;DR: In this paper, a series of samples of AlSi12 have been manufactured by SLM process to study the effect of process parameters and post-build heat treatment on the microstructure and corresponding mechanical properties.

TL;DR: In this article, 3D finite element (FE) simulation of machining can be used as a replacement or a supplementary to the physical experiment allowing an analysis to be performed at a lower cost.

TL;DR: In this paper, sound friction stir welded joints of 6061-T6 aluminum alloy to AZ31B magnesium alloy are obtained with the combination of intermediate rotation rate of tool (600-800 rpm) and low traverse speed (30-60 mm/min) when Mg was on advancing side, tool offset to Mg 0.3 ǫ.

TL;DR: In this paper, the relative density, metallurgical bonding mechanisms, microstructure and mechanical properties of 1Cr18Ni9Ti stainless steel samples with 60-150μm powder layers are presented.

TL;DR: In this paper, a thermal analysis of 316L stainless steel sheets during pulsed Nd-YAG laser-beam welding was carried out using three different heat sources employing SYSWELD.

TL;DR: In this paper, the microstructures and mechanical properties of stainless steel/copper laser welding were investigated by controlling the processing parameters of welding speed and laser power as well as the offset and incline angle of the laser beam in the direction of the stainless steel.

TL;DR: In this paper, the authors investigated the influence of the bulk and flow characteristics of two thermoplastic elastomers, present in three different particle size distributions (PSD), on the resulting part properties.

TL;DR: In this article, a tool traverse speed of 70 and 80 mm/min was used to form defect free stir zone in aluminum and copper, respectively, and the intermetallics layers were identified and confirmed as Al 2 Cu, AlCu, Al 4 Cu 9 using transmission electron microscope (TEM), X ray diffraction technique (XRD) and energy diffraction spectrum (EDS).

TL;DR: In this article, an approach of optimizing the profile and magnitude of residual stress is proposed by analyzing the effects of depth of cut on the redistribution of residual stresses, and the results demonstrate that the distortion of thin-walled part is significantly affected by the residual stress generated after the material is cut away.

TL;DR: In this article, a three dimensional finite element (FE) model was developed to simulate residual stress induced for laser cladding of AISI 4340 steel powder onto a similar substrate material.

TL;DR: In this article, the impact of multi-layer laser cladding on the amount and mode of distortion and thermal history at selected substrate locations in Inconel® 625 plates is investigated and quantified for different processing conditions and deposition patterns.

TL;DR: In this article, an electrically assisted friction stir welding (FSW) system has been developed, which enables a local electrical current field moving with the FSW tool without requiring the tool to be one of the electrodes.

TL;DR: In this article, a recast layer formed in Inconel alloy 718 (IN718) as a result of laser shock peening without an ablative layer was characterized and compared with surface condition of a sample peened with a protective overlay.

TL;DR: In this paper, the authors present experimental and numerical investigations in machining induced subsurface microstructure, microhardness and grain size in Ti-6Al-4V titanium alloy.

TL;DR: In this paper, a geometrical model of the deposited filament is developed to predict the surface roughness of part after barrel finishing operation, which is a useful tool in computer aided manufacturing step to choose the optimum combination of process parameters in order to obtain the desired results provided by barrel finishing operations.

TL;DR: In this paper, the authors used the Gurson-Tvergaard-Needleman (GTN) damage model to determine the forming limit curve of anisotropic sheet metals.

TL;DR: In this article, a modeling approach of the SLM process was developed to investigate the effect of some process parameters, such as the exposure time (texpo) of the laser beam on each point along its trajectory, the pressure of the protective gas (argon) and the spatial thermal energy distribution on the dimensional characteristics of the melted track.

TL;DR: For characterizing the hot workability of high-strength AA7050 aluminum alloy, constitutive equations and processing maps were established in this paper, and the activation energy values under different conditions were obtained by the constitutive analyses.

TL;DR: In this paper, the influence of tool nose radius on the residual stress distribution developed in Inconel 718 by finish turning is investigated, and the results show that an increase in tool nose diameter results in; increased radial cutting forces, increased microstructural deformation depth, higher near surface tensile stresses (up to 1550 MPa with a worn tool), and deeper tensile and compressive residual stress distributions.

TL;DR: In this paper, the suitability of the clinching process for the production of plastic-metal hybrid joints was evaluated by a campaign of experimental tests on aluminium alloy AA5053 and polystyrene.

TL;DR: In this paper, the effect of preheating on the morphology of micro-cracks is discussed, and the influence of different laser powers and different scanning velocities on the microstructure, relative density and deformation of the ceramic sample is investigated.

TL;DR: In this paper, a dual experimental-numerical approach was carried out to estimate thermal cycles and resulting fusion depths obtained during the selective laser sintering (SLS) of two polymers: PA12 and PEKK.

TL;DR: In this article, a 5754 Al alloy and T40 were joined in butt configuration by focusing a fiber laser onto the titanium side, close to the weld centerline (offset) The keyhole was made entirely of titanium, and the fusion of the aluminum was achieved by heat conduction.