Showing papers in "Journal of Materials Processing Technology in 1999"

TL;DR: In this paper, the relatively low cost stir casting technique is evaluated for use in the production of silicon carbide/aluminium alloy MMCs, and the technical difficulties associated with attaining a uniform distribution of reinforcement, good wettability between substances, and a low porosity material are presented and discussed.

TL;DR: A detailed review of the various types of nickel-based alloys available on a commercial basis and their development including alloying additions as well as processing techniques employed to achieve specific mechanical and/or chemical properties is presented in this article.

TL;DR: In this paper, a four-factor five-level central composite rotatable design matrix with full replication for planning, conduction, execution and development of mathematical models is proposed for predicting the weld bead quality and selecting optimum process parameters for achieving the desired quality and process optimization.

TL;DR: In this paper, the effect of tool cutting edge geometry and workpiece hardness on the surface roughness and cutting forces in the finish hard turning of AISI 52100 steel was investigated.

TL;DR: In this paper, the machining characteristics of Ti-6A1-4V were investigated with kerosene and distilled water as the dielectrics, and the results showed that the material removal rate is greater and the relative electrode wear ratio is lower, when machining in distilled water rather than in keroene.

TL;DR: In this article, the optimization of turning operations based on the Taguchi method with multiple performance characteristics is proposed, and the orthogonal array, multi-response signal-to-noise ratio, and analysis of variance are employed to study the performance characteristics in turning operations.

TL;DR: A review of the analytical and experimental methods used to measure cutting temperature can be found in this article, where some simple analytical models can be used to show the effects of cutting parameters, such as cutting speed and feed rate.

TL;DR: In this paper, an analysis of the basic material removal mechanism in the Electrochemical Discharge Machining (ECDM) process for the effective machining of nonconducting ceramic materials with enhanced machining rate and higher machining accuracy is presented.

TL;DR: In this article, the microstructures of AISI 4340 high strength alloy steel under different tempering conditions are investigated, and the results indicate that the mechanical properties and microstructural features are affected significantly by tempering temperature and holding time.

TL;DR: In this paper, the role played by the cutting parameters, such as cutting speed, feed rate, tool geometry and tool coating, in residual stresses induced by orthogonal cutting in AISI 316L standard and resulfurized steels was investigated.

TL;DR: The drill design for accurate temperature measurement at the drill point is described and it is shown that whilst the temperature may go to much higher than 55°C because of the poor conductivity of the bone the depth of damage is not critical insofar as screw fixation is concerned.

TL;DR: In this article, carbon fiber reinforced plastic (CFRP) composites are found to be cut satisfactorily by a pulsed Nd:YAG laser at the optimum process parameter ranges.

TL;DR: In this article, the authors used uncoated cemented carbide tools in the turning of Ti-6% Al-2% Sn-4% Zr -6% Mo. The experiments were carried out under dry cutting conditions.

TL;DR: In this article, the authors have taken the task of identifying the life-time limiting influencing parameters, if possible by separating the different mechanisms acting during model experiments, including residual stresses, thermo-mechanical loading, cyclic strain loads, creep and sintering, as well as interface oxidation.

TL;DR: In this article, the wear behavior of CBN and ceramic tools was studied and it was shown that the main wear mechanism for CBN tools was the abrasion of the binder material by the hard carbide particles of the workpiece.

TL;DR: In this article, a simple orthogonal cutting operation was simulated under different cutting conditions: the tool geometry and cutting speed were changed, and fracture criteria were used to simulate material fracture ductile, fracture criteria have been used.

TL;DR: In this article, two different processing techniques were tested for the development of the anode cermet (ceramic-metal) of the planar high temperature solid oxide fuel cell (SOFC): the coat-mix (CM) process; and tape casting (TC).

TL;DR: In this paper, the possibility of the application of ductile fracture criteria to the formability prediction of sheet metals is examined and some criteria in simple forms are employed and combined with the finite element simulation of sheet metal forming.

TL;DR: In this paper, a bibliographical review of the finite element methods (FEMs) applied to the analysis and simulation of machining is presented, including material removal and cutting processes in general, computational models for specific machining processes, effects of geometric and process parameters, thermal aspects, residual stresses in machining, dynamic analysis and control of machine tools, tool wear and failure, chip formation mechanism, and optimization.

TL;DR: In this paper, the microstructures produced by the retrogression and re-ageing treatments were characterized by transmission electron microscopy, electron diffraction and differential scanning calorimetry.

TL;DR: In this article, three types of cutting tool inserts namely, uncoated tungsten carbides, ceramic and cubic boron nitride (CBN), were used to machine two types of specimens, short (discontinuous) and long (continuous) fiber carbon epoxy composites.

TL;DR: In this paper, the residual stress analysis of a thermal barrier coating system was studied experimentally (by X-ray diffraction, micro-Raman techniques and micro-displacement laser transducer) and numerically in the thermal barrier multi-layered system after different thermal cycling processes.

TL;DR: In this paper, the porosity level of a thermal barrier coating was measured using a mercury porosimetry and the effect of sintering on the mean Young's Modulus and hardness was examined with an instrumented depth-sensing micro-indentation technique.

TL;DR: In this article, the effects of energy density of the laser beam, ranging from 0.036 to 0.12 J mm −2, on the physical density, tensile properties and morphology of the sintered specimens were investigated.

TL;DR: In this paper, the influence of the machining parameters (pulse-on time, pulse-off time, table feed-rate, flushing pressure, distance between wire periphery and workpiece surface, and machining history) on the performance of wire electrical discharge machining (WEDM) in finish cutting operations was investigated.

TL;DR: In this paper, a new method of recycling aluminium and aluminium-alloy chips coming from the machining of semi-finished products, which are very difficult to recycle by conventional methods, is presented.

TL;DR: In this article, the fundamental forming principles, the deformation characteristics of multi-point forming, and some defects caused during the forming process are described, and four basic types of multi point forming, non-spring-back forming based on the repeat-forming principle, and step-by-step forming, that can be used to form large sheets with small size apparatus.

TL;DR: In this article, the effect of the chemistry of the steel and the welding process on the softening of the heat affected zone has been investigated and it has been observed that a steel with a high carbon-equivalent exhibited maximum softening.

TL;DR: In this paper, the work of fracture energy of polypropylene composites was investigated with respect to the notched Charpy impact energy, and the composite impact resistance was shown to depend on fiber length and hence on processing.

TL;DR: In this paper, an attempt has been made to develop mathematical models for optimizing electric discharge machining (EDM) characteristics such as the metal removal rate (MRR), the tool wear rate (TWR), and the surface roughness (CLA value).