i-manager's Journal on Material Science (JMS)


Volume 3 Issue 2 July - September 2015

Research Paper

Machinability of Titanium ASTM B-348 Grade-5 Alloy during Dry Turning with CBN Tool

Mukund Dutt Sharma* , Rakesh Sehgal**, Mohit Pant***
* Lecturer, Department of Mechanical Engineering, National Institute of Technology, Hamirpur, India.
** Professor, Department of Mechanical Engineering, National Institute of Technology, Hamirpur, India.
*** Assistant Professor, Department of Mechanical Engineering, National Institute of Technology, Hamirpur, India.
Sharma, M. D., Sehgal, R., and Pant, M. (2015). Machinability of Titanium ASTM B-348 Grade-5 Alloy during Dry Turning with CBN Tool. i-manager’s Journal on Material Science, 3(2), 1-13. https://doi.org/10.26634/jms.3.2.3501

Abstract

To improve the machinability of Titanium ASTM B-348 grade-5 alloy, an attempt has been made to study the effect of machining variables on response parameters which was further validated by literature, SEM (Scanning Electron Microscopy), EDS (Energy Dispersive X-ray Spectroscopy) of tool inserts and chips collected at different conditions. The results reveal that with the increase in feed rate at constant depth of cut, both the main cutting force and the tool tip temperature increase. The dominant wear mechanisms responsible for the crater wear on rake face are adhesion, diffusion wear and chipping at nose of tool insert. Stress or specific cutting force (Kc) decreases with increase in cutting speed from 80 m/min to 140 m/min at all depths of cut with a few exceptions. The power consumption increases with increase in the cutting speed and decrease in depth of cut having maximum value at maximum feed rate, maximum cutting speed and minimum depth of cut. Average surface roughness increases with increase in feed rate and decrease in depth of cut and the peak value of average surface roughness was obtained at 100 m/min cutting speed, because of the presence of severe crater wear. The microscopic analysis of chips indicate the formation of serrated secondary tooth in addition to adiabatic shear bands at different cutting speeds which has significant effect on the main cutting force; thus increasing the tool tip temperature and enhancing the tool wear.

Research Paper

Development of Whiteware Bodies using China Clay from Selected Deposits in Edo and Ekiti States of Nigeria

Ogundare Toluwalope* , Fatile Babajide Oluwagbenga**, Lamidi Yinusa Daniel***
* Lecturer III, Federal Polytechnic Ado- Ekiti, Nigeria.
** Lecturer III, Department of Glass and Ceramic Technology, Federal Polytehnic Ado-Ekiti, Nigeria.
*** Senior Instructor, Department of Glass and Ceramic Technology, Federal Polytechnic Ado-Ekiti, Nigeria.
Toluwalope,O., Oluwagbenga, F. B., and Daniel, L. Y. (2015). Development of Whiteware Bodies using China Clay from Selected Deposits in Edo and Ekiti States of Nigeria. i-manager’s Journal on Material Science, 3(2), 14-20. https://doi.org/10.26634/jms.3.2.3502

Abstract

Ceramic whitewares practically signify vitreous or glassy elements which are usually formed from a mixture of China Clay, ball clay, quartz and feldspar milled to their possible finest particles and fired to form a ceramic compound. Ceramic whitewares are generally associated with some tremendous technical properties which make them applicable in nearly all fields of life. These admirable properties are usually a function of the China Clay present in the composition which varies respectively with their geological deposits, and furthermore affects the mechanical and physical properties of the composed whiteware. This research is therefore aimed at studying the variation of China Clay deposits and their effect in technical properties of ceramic whiteware compositions, for the production of ceramic whitewares. This was carried out by substituting China Clay of different deposits in a standard whiteware composition which was later fired at different temperatures of 1050oC, 1150oC, 1200oC and 1250oC respectively with a soaking time of 1 hour.

Research Paper

Electrical Properties of Nanocomposite Polymer Gels based on PMMA-DMA/DMC-LiCLO2 -SiO2

Rajiv*
*Assistant Professor, Department of Physics, Goswami Ganesh Dutt Sanatan Dharam College, Hariana, Hoshiarpur, Punjab, India.
Kumar, R. (2015). Electrical Properties of Nanocomposite Polymer Gels based on PMMA-DMA/DMC-LiCLO2 -SiO2. i-manager’s Journal on Material Science, 3(2), 21-27. https://doi.org/10.26634/jms.3.2.3503

Abstract

Nanocomposite Polymer Gels (NCPG) composed of Polymethylmethacrylate (PMMA), Lithium Perchlorate (LiClO4), Dimethylacetamide (DMA), Dimethyl carbonate (DMC) and Nano sized fumed silica (SiO2) were prepared to improve the ionic conductivity and mechanical stability of solid state electrolytes. The increase in conductivity with the polymer addition has been explained to be due to the dissociation of undissociated salt present in the electrolytes. With the addition of nano-sized fumed silica (SiO2 ) to the gels, the ionic conductivity further increased which has been explained on the basis of double percolation threshold model. The dependence of conductivity of NCPGs on temperature was also measured, and a maximum room temperature conductivity of 2.45×10-2 S cm-1 was obtained for electrolytes composed of DMA+0.5M LiClO4 + 10 wt% PMMA + 8 wt% SiO2 . The effect of dielectric constant of solvent has also been studied. The conductivity of composite gels does not show much change over 20-1000 C temperature range and also remains constant with time which is suitable for their use as electrolytes in various devices like solid state lithium ion batteries, electrochemical display devices, electrochemical sensors etc.

Research Paper

A Study on the Residual Stresses in Resistance Spot Welding

Yasser Rihan* , S. Ayyad**, M.I. Elamy***
* Atomic Energy Authority, Hot Lab. Centre, Anshas, Egypt.
**-*** Menoufia University, Faculty of Engineering, Production Engineering & Mechanical Design Department, Egypt.
Rihan, Y., Ayyad, S., and Elamy, M. I. (2015). A Study on the Residual Stresses in Resistance Spot Welding. i-manager’s Journal on Material Science, 3(2), 28-32. https://doi.org/10.26634/jms.3.2.3504

Abstract

Spot-welded joints are widely used in industries. A simplified structural model is proposed in this paper to study the residual stresses in spot-welded joints. The current paper describes the influence of the weld parameters on the residual stresses of resistance spot welds on 304 type stainless steel sheets. Various loading conditions and joint parameters are considered. It is found that the increase of both weld current and weld time decreases the residual stresses, and the increase of electrode force decreases the residual stresses. The nugget diameter increases continuously with weld current.

Review Paper

Oxidation Stability of Fuels Derived from Oils: A Review

Amit Sarin* , Meetu Singh**, Neerja***
* Professor and Head, Department of Applied Physics, Amritsar College of Engineering and Technology, Amritsar, India.
**Research Scholar, Department of Applied Sciences, Punjab Technical University, Jalandhar, India.
*** Assistant Professor, Department of Physics and Electronics, DAV College, Amritsar, India.
Sarin, A., Singh, M., and Neerja. (2015). Oxidation Stability of Fuels Derived from Oils: A Review. i-manager’s Journal on Material Science, 3(2), 33-38. https://doi.org/10.26634/jms.3.2.3505

Abstract

The price and uncertainties in the availability of traditional fuel availability is rising continuously, hence there is renewed interest in fuels from edible and non edible oils for diesel engines. Fuels synthesized from vegetable oils, animal fats and used cooking oils are considered as renewable substitutes for fossil fuels, due to their environmental values. These fuels consist of Fatty Acid Monoalkyl Esters (FAME). Oxidation of fuels from oils gives products that degrade the quality of fuels because fatty acid derivatives are more sensitive to oxidative degradation than mineral fuels. Thus, oxidation stability is a prime factor during the storage of such fuels. The present paper is an overview of the work done by different researchers on the oxidation stability of such fuels.