Showing papers in "Journal of Materials Processing Technology in 2011"

TL;DR: In this article, two MCP Realizer machines were used to process 6061 and AlSi12 alloys, one processing at 50 W and the other at 100 W laser power.

TL;DR: In this paper, the state of the art of electromagnetic forming is reviewed considering: • basic research work regarding the process principle, significant parameters on the acting loads, the resulting workpiece deformation, and their interactions, and the energy transfer during the process; • applicationoriented research work and applications in the field of forming, joining, cutting, and process combinations including electromagnetic forming incorporated into conventional forming technologies.

TL;DR: In this paper, the microstructure and the mechanical properties of Ti-6Al-4V components, fabricated by two different wire-based additive layer manufacturing techniques, namely laser-beam deposition and shaped metal deposition, are presented.

TL;DR: In this paper, a 2D lattice Boltzmann model is developed to investigate melting and re-solidification of a randomly packed powder bed under the irradiation of a Gaussian beam during selective beam melting processes.

TL;DR: In this paper, the effect of dry machining on surface integrity and residual stresses when machining Inconel 718 superalloy was reviewed and an optimal cutting speed of 60m/min was determined, and additional measurements and observations were performed.

TL;DR: In this paper, the surface integrity characteristics of machined surface as a function of depth have been analyzed for different combinations of cooling/lubrication machining conditions, and the results show that cryogenic machining processes can be implemented to improve all major surface integrity features, thus improving the final product quality level.

TL;DR: In this paper, the effect of activated tungsten inert gas (activated TIG) process on weld morphology, angular distortion, delta-ferrite content, and hardness of Type 316L stainless steels was investigated.

TL;DR: In this article, the process characteristics of the synergic cold metal transfer (CMT) process have been examined for welding aluminium alloy using a simple backlighting system and through the arc monitoring the droplet transfer modes were identified.

TL;DR: In this article, SiC particles were incorporated by using Friction Stir Processing (FSP) into commercially pure aluminium to form particulate surface layers and they were subjected to the various tool rotating and traverse rates with and without SiC powders.

TL;DR: In this paper, the constitutive fitting of the stress-strain curves to the widely employed Johnson-Cook material model equation is evaluated and also a new model is proposed based on a modified J-C model to account for the variation of strain hardening with strain rate.

TL;DR: In this paper, three complementary impact welding technologies are described: explosive welding, magnetic pulse welding, and laser impact welding, which have been used to provide metallurgical bonds between both similar and dissimilar metal pairs.

TL;DR: In this paper, the electron beam melting (EBM) was used to fabricate metal objects by the layer by layer sintering and/or melting metal powder, which is referred to as EBM fabrication.

TL;DR: In this paper, a 3D transient heat transfer numerical simulation with temperature-dependent material properties is conducted to investigate temperature field evolution, thermal cycling character, temperature gradient and the effects of depositing directions on the thermal process of single-pass ten-layer rapid prototyping.

TL;DR: In this article, the effectiveness of carbon dioxide snow (CO2) as a coolant for turning Ti-10V-2Fe-3Al was analyzed and compared to flood emulsion cooling the flank wear was uniform spreaded and tool life was increased by a factor of two even at higher cutting speeds.

TL;DR: In this article, the effects of cooling air temperature on the machinability characteristics of Ti-6Al-4V alloy with uncoated carbide inserts were investigated to compare the effect of different cooling air temperatures.

TL;DR: In this article, the effect of individual process parameters on lap-shear separation load was evaluated using a conventional pin (CP) tool and an off-center feature (OC) tool.

TL;DR: In this article, a model for determination of the clad geometry and dilution in laser cladding is presented, which involves a mathematical transformation of the balance equations describing the physical effects.

TL;DR: In this paper, a new flow softening expression was proposed and integrated into the material constitutive model to simulate adiabatic shear bands and serrated chips, and various temperature-dependent softening scenarios were tested using finite element simulations, and the results were compared with experimental data from the literature.

TL;DR: In this article, a model based on a double-ellipsoidal volume heat source to simulate the gas metal arc welding (GMAW) heat input was developed to predict the temperature field and thermally induced residual stress in the hybrid laser-gas arc welding process, and it was found that an increase in welding speed can reduce the residual stress concentration in the as-weld specimen.

TL;DR: In this paper, an alternative method to identify the post-necking hardening behavior of sheet metal without using a finite element model is presented, where the key point is the minimization of the discrepancy between the internal and external work in the necking zone during a tensile test.

TL;DR: In this paper, a slip-line field model was proposed to obtain the shear flow stress and hydrostatic pressure as functions of strain, strain-rate, and temperature in the primary shear zone.

TL;DR: In this article, the authors have experimentally, numerically and theoretically investigated the water jet cleaning process and showed that the decay of stagnation pressure along the axial direction is linear and no cleaning is possible at radial locations greater than 1.68 D from the centerline.

TL;DR: In this article, the role of processing parameters on the densification mechanism and microstructural evolution in laser sintered Al-12Si powder has been explored and it was established that both the density and micro-structural development were controlled by the specific laser energy input.

TL;DR: In this article, the authors showed that the formation of gas bubbles in a narrow region inside a polyethylene terephthalate (PET) sample adjacent to the interface can be induced by the pressure induced by expansion of these bubbles, which secures tight bonding in the micro size between AZ91D and PET specimens.

TL;DR: Experiments were conducted for microwave heating and melting of lead, tin, aluminium and copper with the aid of susceptors and detailed results were presented for various microwave power levels and sample loading.

TL;DR: A356/Al 2 O 3 surface nanocomposite was produced by friction stir processing (FSP) method as mentioned in this paper, and X-ray diffractometery, optical and scanning electron microscopy, microhardness and nanoindentation tests were used to characterize the samples.

TL;DR: In this article, an investigation was conducted in order to produce aluminium based functionally graded MMC reinforced by SiC ceramic particles with median size of 118.8, 37.4 and 12.3 µm.

TL;DR: In this article, the experimental and numerical study of face milling of Ti-6Al-4V titanium alloy was performed by uncoated carbide cutters in the presence of an abundant supply of coolant.

TL;DR: In this article, a high-speed camera was used to measure the uniaxial tensile properties and the formability of steel sheets in relation to the strain rate effect.

TL;DR: In this article, a carbon nanotube (CNT) reinforced aluminum alloy 6061 (Al6061) composite was synthesized by semi-solid powder processing (SPP) for the first time.