Advanced Materials and Processes Research Institute
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809 research outputs found
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Microstructural and magnetic studies on thermomechanically treated HSLA steel
No full textThermomechanical treatment of commercial grade HSLA steel microalloyed with Nb, V and Ti has been carried out in order to obtain microstructures with spheroidised carbides evenly distributed throughout the matrix and therefore with good magnetic properties at high strength levels. Alloys were tempered after rolling-quenching, as well as forging-quenching. In both cases, rolled as well as forged, good magnetic properties were obtained at a strength of 600–620 MPa after spheroidisation of carbides. Thus, for a given level of carbon, the spheroidised carbides lead to a lower coercive force compared to the case in which they are lamellar. This is believed to be associated with lower locked-up microstresses in the former situation.\u
Activated sintered 6061 Aluminium alloy Particulate Composite Containing Coated Graphite in controlled Interphases in Composite Materials
No full textMECHANICAL BEHAVIOUR OF SINTERED 6061 ALUMINIUM ALLOY AND ITS COMPOSITES CONTAINING SOFT OR HARD PARTICLES
No full textPREPARED BY THE CONVENTIONAL POWDER METALLURGY (P/M) ROUTE WERE THE 6061 ALUMINUM ALLOY AND ITS PARTICULATE COMPOSITES CONTAINING UP TO 14 VOL.% OF GRAPHITE, TALC, ALUMINA, AND TIC DISPERSOIDS; PROPERTIES LIKE YIELD STRESS, HARDNESS, POROSITY, ULTIMATE TENSILE STRENGTH, AND ELONGATION WERE EVALUATED; USING SCANNING ELECTRON MICROSCOPY, FRACTOGRAPHS WERE OBSERVED; THE COMPOSITES CONTAINING TIC SHOWED IMPROVEMENT IN PROPERTIES OVER THAT OF THE BASE ALLOY, WHEREAS THOSE CONTAINING GRAPHITE SHOWED MINIMUM MECHANICAL PROPERTIES AMONGST ALL TYPES OF COMPOSITES; THE MECHANICAL BEHAVIOR OF THE COMPOSITES IS EXPLAINED ON THE BASIS OF INTRINSIC PROPERTIES OF DISPERSOIDS AND SINTERING CHARACTERISTICS OF THE COMPOSITE. TERMS: M--(U), INDIA, ENGLISH, AA 6061, ELONGATION, ENERGY DISPERSIVE ANALYSIS, FRACTOGRAPHY, FRACTURE SURFACE, PRECIPITATION HARDENING, RESIDUAL STRESS, SEM, TENSILE PROPERTIES, TENSILE YIELD STRENGTH, ULTIMATE TENSILE STRENGTH, X-RAY ANALYSIS, HEAT TREATMENT, SINTERING, SOLUTION HEAT TREATMENT, WATER QUENCHING, ALUMINUM ALLOYS, MECHANICAL PROPERTIES, EXPERIMENTA
Energetics of particle transfer from gas to liquid during solidification processing of composites
No full textThe energetics for equilibrium transfer of solid particles in the shape of prolate spheroids across a stationary gas-liquid interface is computed as a function of the path of submersion. By considering the energy for submersion as comprising surface, buoyancy, and potential energies, equations have been derived for these energies in terms of particle size, degree of submersion, contact angles, surface tension, and densities of particle and liquid. The results for wetting particles show that certain intermediate configurations of partially submerged particles can be energetically stable even though this is not reflected in the calculations based only on initial and final configurations. The results of the analysis are discussed in the context of synthesis by stir casting of metal-matrix composites where the externally added particles or fibers must cross over in succession a gas-oxide interface, oxide-melt interface, and melt-solidification front interfac
Microstructure - and Property - Related Changes in a Pressure Die Cast Graphitic Al-Si Alloy Induced by Heat Treatment
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Potentiodynamic studies of modified 9Cr-1Mo ferritic steel in sulphuric acid and seawate
No full textThe potentiodynamic behaviour of annealed and cold worked 9Cr-1Mo, modified with V0.198 wt% and Nb 0.072 wt%, ferritic steel has been studied in H2SO4 in the concentration range 0.1–5 N at a scan rate of 45 mV min−1 at 25°C. Ecorr becomes more noble while the other electrochemical parameters, i.c. icorr, icrit, ip and Ecp for both states of the modified steel decrease with the increase in acid concentration. This trend was more marked in the annealed than in the cold worked alloy. This alloy shows a higher corrosion resistance in IN H2SO4 than pure 9Cr-1Mo steel. Slight passivation at higher potential in both cold worked and annealed modified 9Cr-1Mo was observed in seawater whereas no passivation was indicated in the case of annealed pure 9Cr-1Mo steel under the same experimental condition. The different corrosion behaviour has been explained as a result of microstructural differences.\u
A kinetic model for batch coal flotation
No full textExperiments were carried out in a batch flotation cell using four coals at different levels of variables. From the results of these experiments, it is verified that the recoveries of non-ash and ash material from any size fraction follow first order kinetics given by the equation:\ud
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It has been found in the present investigation that the rate constant ‘k’ for any size fraction is dependent not only on the average size of the size fraction, but also on the proportion of ash and non-ash fractions within that size range and in the fines below 75 micron in the feed. When logarithm of rate constant for the recovery of non-ash material i.e. kN of any size range is plotted against a parameter XN which is defined as\u
