Surface Texture and Elemental Characterization of High Aspect Ratio Blind Micro Holes on Different Materials in Micro EDM
Publication date: 2014 Source:Procedia Materials Science, Volume 6 Author(s): Swapan Barman , Vijay , Nagahanumaiah , Asit Baran Puri Micro features machined through micro electrical discharge machining (micro EDM) are adversely affected by tool wear. Tool electrode and machined parts are deformed due to stochastic behaviour of discharge processes. Deposition of tool electrode material on workpiece deteriorates the surface quality of the micro part. Study of the surface quality of blind micro hole is very difficult in non-destructive method due to its miniature size. In this communication, attempts have been made to ...
Source: Procedia Materials Science - October 12, 2014 Category: Materials Science Source Type: research
Machining of Tungsten Heavy Alloy under Cryogenic Environment
Publication date: 2014 Source:Procedia Materials Science, Volume 6 Author(s): Srinivasa Rao Nandam , U. Ravikiran , A. Anand Rao The machining of tungsten heavy alloy is very difficult as it has high strength and hardness, which requires special cutting tools and cutting process. Though carbide tools are extensively used in conventional cutting, these lead take high machining time and tool failures which cause to decrease in productivity. To overcome the above, special techniques are being practiced in machining of tungsten alloys, one such technique is machining under cryogenic environment. In this paper, liquid ni...
Source: Procedia Materials Science - October 12, 2014 Category: Materials Science Source Type: research
Design Verification through Tolerance Stack up Analysis of Mechanical Assembly and Least Cost Tolerance Allocation
Publication date: 2014 Source:Procedia Materials Science, Volume 6 Author(s): A.K. Sahani , P.K. Jain , Satish C. Sharma , J.K. Bajpai Geometric dimensioning and Tolerancing (GDT) constitutes the dominant approach for design and manufacture of mechanical parts that control inevitable dimensional and geometrical deviations within appropriate limits. The stack up of tolerances and their redistribution without hampering the functionality is very important for cost optimization. This paper presents a methodology that aims towards the systematic solution of tolerance stack up problem involving geometric characteristics....
Source: Procedia Materials Science - October 12, 2014 Category: Materials Science Source Type: research
Effect of Temperature and Strain Rate on Deformation Behavior of Zirconium Alloy: Zr-2.5Nb
Publication date: 2014 Source:Procedia Materials Science, Volume 6 Author(s): K.K. Saxena , S.D. Yadav , S. Sonkar , V. Pancholi , G.P. Chaudhari , D. Srivastava , G.K. Dey , S.K. Jha , N. Saibaba The characterization of hot deformation of Zr-2.5Nb in the strain rate range of 0.01 – 10s-1 and in the temperature range of 700- 925oC has been studied using hot compression testing on Gleeble-3800. For this study, processing maps approach has been adopted and their interpretation done using the Dynamic Material Model (DMM). The power dissipation maps of Zr-2.5Nb with in (α+β) phase field exhibits a domain of dy...
Source: Procedia Materials Science - October 12, 2014 Category: Materials Science Source Type: research
OGMS: A Facility to Measure Out-gassing Rate of Materials
Publication date: 2014 Source:Procedia Materials Science, Volume 6 Author(s): Ranjana Gangradey , Samiran Mukherjee , Paresh Panchal , N. Ravi Prakash OGMS, the OutGassing Measurement System, is a facility to measure the outgassing rates of materials. The rate is highly important factor in vacuum science dealing with systems working at pressures below 10-6 mbar. In ultra- high vacuum range it plays role in system pressure at given pumping speed. For standard materials the data is available in literature but at times not under condition of specific application. Many application use very specific materials under vacu...
Source: Procedia Materials Science - October 12, 2014 Category: Materials Science Source Type: research
Degassing Measurement Studies Carried out for Various Forms of Activated Carbon
Publication date: 2014 Source:Procedia Materials Science, Volume 6 Author(s): Samiran Mukherjee , Ranjana Gangradey , Sapana Guru , Pratik Nayak , Jyoti Agrawal , V.S. Tripathi Activated carbon with its large surface area has extraordinary adsorptive capabilities through physical adsorption. Using this property a project on development of cryoadsorption Cryopump is ongoing at Institute for Plasma Research (IPR), India. Under the project, to study the desorption characteristics of various sorbents; a DeGassing Measurement System (DGMS) was set up. The DGMS facility works under vacuum environment with additional fe...
Source: Procedia Materials Science - October 12, 2014 Category: Materials Science Source Type: research
A New Approach to Dynamical Determination of the Active Zone in the Framework of the Hybrid Model (Quantum Mechanics/ Molecular Mechanics)
Publication date: 2014 Source:Procedia Materials Science, Volume 6 Author(s): O.E. Glukhova , G.V. Savostyanov , M.M. Slepchenkov A new approach to dynamical determination of the active zone in the framework of the hybrid model (quantum mechanics/ molecular mechanics) is developed in this work. The proposed approach is based on using of the original method for calculation of the local stress on the atoms of structure, experiencing different external influence. The algorithm of realization of the proposed approach in the framework of the hybrid model ‘hot spot’ using the quantum tight binding method and empirical...
Source: Procedia Materials Science - October 12, 2014 Category: Materials Science Source Type: research
Temperature Instability in High-Tc Superconducting Wire Exposed to Thermal Disturbance
Publication date: 2014 Source:Procedia Materials Science, Volume 6 Author(s): Ziauddin Khan , Subrata Pradhan , Irfan Ahmed High-Tc superconductor wires/ conductors of longer lengths have emerged as one of the most promising candidates for several useful applications such as in utilities and in current lead powering large magnet system. These conductors are liquid nitrogen cooled and are much cheaper to operate. In the event of intrinsic thermal instability or cooling failure, irreversible transition to normal state may occur. These normal zones may propagate rapidly enough to cause transient heating leading to loca...
Source: Procedia Materials Science - October 12, 2014 Category: Materials Science Source Type: research
Modified Silane Films for Corrosion Protection of Mild Steel
Publication date: 2014 Source:Procedia Materials Science, Volume 6 Author(s): Poovarasi Balan , Mark Jude Shelton , Debbie Ong Li Ching , Gwee Chu Han , Lithnes K. Palniandy Chromium pre-treatments of metal have been replaced by silane pre-treatments as more environmental friendly option. Corrosion inhibitors and nanoparticles can be added in the silane sol-gel network have been reported to improve corrosion resistance. The present work investigates the effect of cerium nitrate activated nanoparticles additions into a sol-gel hybrid silane matrix coated on low carbon steel substrates. Two different types of nanopa...
Source: Procedia Materials Science - October 12, 2014 Category: Materials Science Source Type: research
Effect of fabrication technique on microstructure and electrical conductivity of polyaniline-TiO2-PVA composite material
Publication date: 2014 Source:Procedia Materials Science, Volume 6 Author(s): Rajeev Arora , Utam Kumar Mandal , Pankaj Sharma , Anupam Srivastav The aim of this workis to study the microstructure and D.C electrical conductivity of polyaniline-TiO2-poly-vinyl alcohol polymeric composite material synthesized by two methods. The first method of synthesis involved mixing of 40 wt% blendedpowders of polyaniline and TiO2 micro particles in aqueous solution of PVA and the second method used ‘in situ’ deposition technique in which nano particle sized fine grade anatase TiO2 powder (approximately 50nm average particle ...
Source: Procedia Materials Science - October 12, 2014 Category: Materials Science Source Type: research
Optimization of Drilling Parameters of Hybrid Metal Matrix Composites Using Response Surface Methodology
Publication date: 2014 Source:Procedia Materials Science, Volume 6 Author(s): Gaurav Chaudhary , Manoj Kumar , Santosh Verma , Anupam Srivastav Metal matrix composites (MMCs) consisting of two or more physically/chemically distinct phases are potential material for aerospace, automobile, defense, sport and research industries. Aluminum Matrix Composites (AMCs) reinforced with ceramic materials such as SiC, Al2O3 etc. is attractive material for modern industrial sectors consequent to the increasing demand for new, light-weight materials having greater mechanical strength. Such materials are termed as hybrid aluminum...
Source: Procedia Materials Science - October 12, 2014 Category: Materials Science Source Type: research
Thermal Behavior of SST-1 Vacuum Vessel and Plasma Facing Components during Baking
Publication date: 2014 Source:Procedia Materials Science, Volume 6 Author(s): Ziauddin Khan , Yuvakiran Paravastu , Subrata Pradhan For plasma physics experiment, the baking of vacuum vessel (VV) as well as plasma facing components (PFC) of Steady-state Superconducting Tokamak (SST-1) is very essential. SST-1 vacuum vessel consists of ultra-high vacuum (UHV) compatible sixteen sectors in which U-shaped baking channels are embedded on inner surfaces of each of them. Similarly, PFCs are comprised of modular graphite diverters and movable graphite based limiters and stainless steel (SS 304L) tubes are brazed on the bac...
Source: Procedia Materials Science - October 12, 2014 Category: Materials Science Source Type: research
Effect of Interface Strength of M23C6 in Steel Matrix on Tensile Toughness and Strength
In this study, a model was proposed to estimate interface and matrix strength of composites and share in increasing tensile toughness and strength. Then, strength of interface and its share in increasing tensile toughness and strength were calculated in a case study of composites containing M23C6 particle reinforcement in matrix of 1.2542 tool steel. (Source: Procedia Materials Science)
Source: Procedia Materials Science - October 12, 2014 Category: Materials Science Source Type: research
Microstructure and Tensile Toughness Correlation of 1.2542 Tool Steel after Deep Cryogenic Treatment
Publication date: 2014 Source:Procedia Materials Science, Volume 6 Author(s): Seyed Ebrahim Vahdat , Said Nategh , Shamsoddin Mirdamadi Microstructure of an alloy has a significant effect on mechanical properties. Deep cryogenic treatment extends life of tool steels because of microstructure changes. In this research, effects of microstructure parameters were studied on tensile toughness of 1.2542 tool steel. The results showed that high population density and high volume fraction of secondary carbides were responsible for tensile toughness enhancement. (Source: Procedia Materials Science)
Source: Procedia Materials Science - October 12, 2014 Category: Materials Science Source Type: research
Tribo-electric Charging in the Ultra-high Precision Machining of Contact Lens Polymers
This study observes static charging during the ultra-high precision machining of contact lens polymers and identifies machining parameters and environmental factors influencing the static buildup. The influence of relative humidity and certain cutting parameters such as cutting feed rates were observed as factors in static charging. (Source: Procedia Materials Science)
Source: Procedia Materials Science - October 12, 2014 Category: Materials Science Source Type: research
