Showing papers in "Journal of Materials Processing Technology in 2017"

TL;DR: In this paper, microstructure, defect formation and mechanical properties of AISI 316L components are investigated according to the process parameters used for their fabrication, and a first experimental campaign establishes process parameters guaranteeing a density greater than 98% Samples for microstructural and mechanical characterization are then produced based on these results, varying laser power from 100 W to 150 W, hatch space from 005 mm to 007 mm and orientation from 45° to 90°.

TL;DR: In this article, a temperature control 3D printing system was used to calculate the crystallinity and mechanical properties of polyether-ether-ketone (PEEK) material and perform tension tests.

TL;DR: In this paper, the effect of building direction on the microstructure, mechanical properties and machinability of stainless steel was investigated, and it was found that the micro-structure was homogeneous, at the building direction of 0°, while a number of larger dendritic grains were present in the microstructures, and the tensile properties and hardness values were higher than those at 90°.

TL;DR: In this paper, an Inconel 625-manufactured by SLM, using a hatching + contour procedure, was analyzed to understand fatigue crack initiation and an optimum set of parameters was found to deliver the best surface roughness combined with low porosity.

TL;DR: In this paper, the influence of heat accumulation on bead formation, arc stability, and metal transfer behavior during the manufacture of Ti6Al4V with the gas tungsten wire arc additive manufacturing (GT-WAAM) using localized gas shielding.

TL;DR: In this article, the potential for the use of lightweight materials (aluminum alloys, magnesium alloys and titanium alloys) in high volume vehicle manufacturing is discussed. And the feasibility of implementing these techniques in the industrial setup is discussed, and mechanical properties of welds such as hardness, shear and tensile strength are analyzed.

TL;DR: In this paper, an analytical solution to the transient heat conduction developing during filament deposition in Fused Deposition Techniques (FDT), which is coupled to a routine that activates or deactivates all relevant local boundary conditions depending on part geometry, operating conditions and deposition strategy, is presented.

TL;DR: In this article, the effects of two different scan strategies were investigated and the 17-4PH stainless steel samples fabricated using these strategies, both in as-fabricated and heat-treated conditions, were characterized in terms of relative density, microstructural phase composition and micro-hardness.

TL;DR: In this paper, an infrared camera after calibration test was used to capture the surface temperature of the deposited thin-wall parts for investigating the thermal behavior of gas metal arc welding (GMAW) based additive manufacturing (AM).

TL;DR: In this paper, the effects of laser scan direction, part placement and inert gas flow velocity on the tensile strength of AlSi10Mg parts manufactured using Selective Laser Melting (SLM) were studied.

TL;DR: In this paper, during continuous calendering of graphite anodes and lithium nickel cobalt manganese oxide (NCM) cathodes, the applied line load is tracked and varied at different speeds to compact the electrode to several coating densities.

TL;DR: In this article, a precipitation-hardenable AlSi10Mg alloy with the main focus on the positioning and inclination effects was studied on six characteristic orientations, and the superimposed effects based on the surface condition and thermal post-treatment were taken into account.

TL;DR: In this paper, the microstructures and crystallographic textures of base materials (BM) and the welds were investigated using electron backscatter diffraction (EBSD) technique.

TL;DR: In this article, a selective laser melting (SLM) physical model describing the melt pool dynamics and the response of downward-facing surface morphology evolution of overhanging structure under different laser processing conditions was proposed, in which an enormous difference in thermal conductivity and laser absorption capacity between the as-fabricated part and powder material was taken into consideration.

TL;DR: In this article, the microstructure, hardness and wear resistance of Inconel 625 coatings were investigated at both room and elevated temperatures, and the results indicated that laser cladded inconel 675 coating has finer microstructures, alleviated segregation of Mo and Nb and lower dilution of iron compared with arc welded one as revealed by XRD, SEM and EDS.

TL;DR: In this article, a detailed characterization of the microstructure and the mechanical properties of commercially pure titanium (CP Ti) processed by selective laser melting (SLM) in a regulated reactive atmosphere with a slight addition of oxygen (02-04 vol%) to enhance the mechanical property of the material.

TL;DR: In this paper, an array of 100 miniature tensile bars are produced and tested for a comparable cost and in comparable time to a few conventional tensile bar with this technique, it is possible to evaluate the stochastic nature of mechanical behavior.

TL;DR: In this paper, a density optimization for the efficient electropolishing of Ti-6Al-4V test coupons containing multiple surfaces, which were oriented with respect to the building platform under angles varying from 0 to 135°, was proposed.

TL;DR: A comprehensive summary of the state-of-the-art in this particular field of research is presented in this review as discussed by the authors, where the reported studies are categorised into the different laser applications that have been proposed so far by the research community, namely the welding, cladding, additive layer manufacturing, micro machining and microstructure modification of BMG substrates.

TL;DR: In this article, numerical models are presented to predict three-dimensional solid phase transformation, material hardness, and residual stresses produced by the laser direct deposition process with multi-track and multi-layer capabilities.

TL;DR: In this article, the porosity of laser arc hybrid welded AA6082 aluminum alloy was examined by X-ray non-destructive testing and a volume characteristic coefficient was proposed by pool profiles to predict the percent porosity.

TL;DR: In this article, a mathematical model was developed to calculate the wire flying distance in arc zone, according to which displacement compensation was designed to ensure the size accuracy during gas tungsten arc welding.

TL;DR: In this article, a gas metal arc welding (GMAW) additive manufacturing with flat position deposition free from a turn table is proposed through deposition of inclined thin-walled components.

TL;DR: In this article, the authors measured the residual stress of lap joints of thin steel sheets by the cosα X-ray diffraction method and compared with the numerical simulation, and found that the longitudinal residual stress in the region near the weld is close to the yield strength of the base metal.

TL;DR: In this paper, an innovative surface processing technique, ultrasonic nano-crystal surface modification (UNSM), was used to mitigate the potential for the Ni ions release, which significantly improved surface finish and decrease surface porosity.

TL;DR: In this paper, the effects of pin profiles on the superplastic behavior of FSP tools were investigated. But the results were limited to three different polygonal pin profiles of square, pentagon and hexagon.

TL;DR: In this article, the surface roughness and morphology of AlSi10Mg parts fabricated by Selective Laser Melting is investigated. And the authors present a model able to predict the roughness as a function of the local part geometry.

TL;DR: In this paper, the hybrid deposition and micro-rolling (HDMR) process has been used to eliminate the ubiquitous anisotropy in the WAAM bainitic steel samples, and an initially optimized micro rolling morphology based on decreasing the depth of penetration and increasing the ratio of width to reinforcement was used.

TL;DR: In this paper, the authors proposed a new type of ultrasonic vibration cutting, i.e., high-speed ultra-vibrant cutting (HUVC), in which the vibration is always along with the feed direction.

TL;DR: A finite element analysis based on the Coupled Eulerian-Lagrangian formulation was developed to predict and quantify the influence of FSW process parameters on the formation and extent of the banded structures.