Volume 6 | Issue 1 |

 Abstract

Alumina and zirconia toughened alumina powder were characterized for the properties such as phase purity, particle size and surface area. Both formulations were uni-axially pressed in a compaction die and pressure less sintered at 1550oC to achieve close to theoretical density. For the sake of comparison, the formulations were also vacuum encapsulated and Hot Isostatically Pressed into identical density values at 1350oC and 150MPa pressure. Specimens processed by both techniques were evaluated for the microstructure and fractographs are recorded. Based on microscopic studies the possible mechanisms for the evolution of microstructural features is proposed in the present study. Results will be presented during the conference.

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 Keywords

; Uniaxial Compaction; Isostatic Compaction; Fractography

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 Abstract

Semisolid metal processing or Thixoforming is a developing technology where the material is processed in the freezing range. Thixoforming process results in components with better mechanical properties as compared to conventional processes. The material at this temperature is very soft and as a result lower loads may be applied to obtain the final shape of the component. Process parameters like ram speed, temperature of the billet and die temperature influence the mechanical properties like tensile strength, hardness and wear behavior of thixoformed component. In the present study an attempt is made to understand the effect of process parameters on the mechanical properties of aluminum alloy by carrying out experimental studies. The results indicate the significant influence of billet temperature and die temperature on the tensile strength and hardness of the material.

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 Keywords

Thixoforming, A356, Mechanical Properties, experimental study.

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In the present work, by using Taguchi Robust Design methodology the End milling of EN-19 steel alloy is carried out in order to minimize the Cutting temperature and to optimize the milling process parameters. The selected milling process parameters are Cutting Speed, Feed rate, Depth of cut and coolant flow. Taguchi orthogonal array is designed with three levels, four factors and nine experiments using L9 (34) orthogonal array. The nine experiments are performed and cutting temperature is measured. Results obtained by Taguchi Method, shows that the factors affecting the cutting temperature using ANOVA, are found to be significant factors and it is concluded that the effect coolant flow is more followed by depth of cut, feed and cutting speed for cutting temperature.It is found that S/N ratio value of verification test is within the limits of the predicted value and the objective of the work is full filled.

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 Keywords

Taguchi Robust Design methodology, Milling Process, EN-19 steel alloyl,Signal to Noise Ratioetc.

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Turning operation is one of the primary machining operations wherein enhanced machining performance is obtained by selection of suitable process parameters. High Strength Low Alloy (HSLA) medium carbon steels (EN24 steel) are considered to possess better mechanical properties than carbon steel. In this experimental study, the effects of machining parameters on functional attributes (surface roughness, corrosion rate, current density, wear rate and co-efficient of friction) of the machined samples are evaluated in turning of EN24 steel. The machining parameters selected are cutting speed, feed rate and depth of cut in order to enhance functional attributes of turned components. The result of the investigation revealed that the mentioned machining parameters are necessary and essential to evaluate the functional attributes of HSLA steel effectively.

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 Keywords

Turning, machining parameters, functional attributes, ANOVA.

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 Abstract

Biodiesel (mono alkyl esters) is a cleaner-burning diesel fuel produced using natural, renewable sources, for example, vegetable oils. The utilization of biodiesel in an ordinary diesel engine outcomes in a large reduction of unburned hydrocarbons, carbon monoxide, and other matter harmful to nature. biodiesel works well with new technologies and catalysts, which reduces the soluble fraction of diesel particulate but not the solid carbon fraction, particulate traps, and exhaust gas recirculation leading to longer engine life. As the fossil fuels are depleting constantly, a need has arrived to produce biodiesel from various feedstocks.An attempt has been made to produce biodiesel from Kusum (Carthamus tinctorius L.) oil and the process parameters namely the methanol-to-oil molar ratio, catalyst concentration, reaction time and reaction temperature for biodiesel production were optimized. Taguchi robust design process was used by taking L9 orthogonal array and analysed the performance parameters that influence the production process. The results showed that the optimum yield of biodiesel was 93.8% with viscosity 5.60 cSt, with a methanol-to-oil molar ratio of 4:1, catalyst concentration of 1.5 wt%, reaction time of 90 min and reaction temperature of 600C. The catalyst concentration was found to be the most influencing parameter which contributed 51.1% and 50.8% of the total effect on the yield of biodiesel, Y1, and viscosity of biodiesel, Y2, respectively. Regression equation was arrived by using ANOVA technique. The multi parameter output such as Yield and viscosity at 400C were optimized using Principle Component Analysis.

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 Keywords

Biodeisel, process parameters, Taguchi PCA method, Kusum oil.

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In this present generation, the computer has evolved a major requirement to solve complex problems. Computational fluid dynamics (CFD) has found more and more applications in diesel engine research, design and development. Using these experimental tests to reduce the number of investigated parameters as well as time and thus costs. The various successful applications have proven the reliability of using CFD tools to assist combustion in diesel engine research. By using CFD tools effectively it is easy to predict and analyze various details that are technically difficult like in cylinder process of diesel engine combustion, temperature & pressure contours, emissions etc. Combustion is one of the most complicated process in CI engine. The combustion causes rise in the temperature in the combustion chamber, due to the high temperature various parts of the engine are subjected to thermal stresses which cause failure of these components. In order to avoid various failures, it is necessary to make a study of combustion. So, the preventive measures can be taken. In this project, analysis of combustion is done using diesel and turmeric fuel is also used for combustion analysis replacing diesel. Alternate fuel is used, as there is only 30% of conventional fuel is left in our planet. This study is done using CFD tools and got temperature and pressure contours. An engine is modeled in CATIA, meshed using ANSYS ICEM 15.0 and analysis of combustion is done in ANSYS FLUENT 15.0

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 Keywords

Computational Fluid Dynamics (CFD), combustion, turmeric fuel, diesel fuel.

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 Abstract

In the present study effect of shielding gases in welding process which results in weld bead characteristics of metal was studied. The welding was carried out by using the GTAW(Gas Tungsten Arc Welding)/TIG (Tungsten Inert Gas) process. GTAW is very commonly used in the areas such as rail, car manufacturing, automotive and chemical industries. The materialInconel718 is a nickel-based super alloy generally used at elevated temperature applications including turbine engines and power generation because of its superior mechanical properties. In the present experimentation, An attempt was made to study the weld characteristics of Inconel718alloy weld samples with different shielding gases of Argon and Argon-hydrogen gas.

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 Keywords

GTAW, shielding gases, Hardness, NDT, Ultrasonic Test

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 Abstract

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Hybrid Composites, Mechanical Properties

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The comprehensive body of knowledge that has built up with respect to the friction stir welding (FSW) of aluminum alloys since the technique was invented in 1991 is reviewed on this paper. Methods/Analysis: The Friction Stir Welding of aluminum alloys with various other alloys and aluminium matrix composites are reviewed on this paper. The basic principles of FSW are described, followed by process parameters study which affects the weld strength. Findings: The microstructure and the likelihood of defects also reviewed. Tensile strength properties attained with different process parameters are discussed. Conclusion: It is demonstrated that FSW of aluminum and other material is becoming an emerging technology with numerous commercial applications.

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 Keywords

Aluminum Alloys, Tool design, Tool Wear, Friction-Stir Welding, Microstructure, Tensile Strength, and AMC

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This paper provides the information regarding the field of severe plastic deformation (SPD), which is an evolving technology in metallurgical sciences in these days. It discusses the severe plastic deformation and the mechanism involved in it. Further, it describes the methods of SPD, its advantages and limitations as well as applications.

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 Keywords

Severe Plastic Deformation, ECAP, CGP, HPT, ARB, RCS, multi directional forging, cyclic extrusion and compression, twist extrusion, ultra-fined grains

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