Open Access. Powered by Scholars. Published by Universities.®
Articles 1 - 16 of 16
Full-Text Articles in Engineering
Effect Of Ni On The Formability And Texture Of Hot Rolled Weathering Steel, Gadadhar Sahoo, I. S. Wani, S. B. Kumar, Balbir Singh, Atul Saxena, R. Basu
Effect Of Ni On The Formability And Texture Of Hot Rolled Weathering Steel, Gadadhar Sahoo, I. S. Wani, S. B. Kumar, Balbir Singh, Atul Saxena, R. Basu
Journal of Metals, Materials and Minerals
Formability behavior in two grades of hot rolled low carbon weathering steel with varying nickel content i.e., SCR 1 (Fe-0.116P-0.018Ni) and SCR 2 (Fe-0.115P-0.34Ni), have been evaluated in relationship to microstructure, EBSD estimated orientation distribution function (ODF), special boundary nature, mechanical properties and formability parameters like tensile stain hardening exponent (n) and plastic anisotropy ratio (r). The alloy sample SCR 1 exhibited improved formability characteristics in terms of stain hardening exponent (n) and plastic anisotropy ratio (r). This was mainly attributed to relatively higher fraction of the ND//<111> orientation or the ? fibre texture component and increased presence of sigma …
Effect On Mechanical Properties Of Aluminium Alloy Composites On Adding Ash As Reinforcement Material, Mohd Zafaruddin Khan, Mohd Anas, Ather Hussain, Md Irshadul Haque, Kamran Rasheed
Effect On Mechanical Properties Of Aluminium Alloy Composites On Adding Ash As Reinforcement Material, Mohd Zafaruddin Khan, Mohd Anas, Ather Hussain, Md Irshadul Haque, Kamran Rasheed
Journal of Metals, Materials and Minerals
To produce Al-matrix cast particle composites, wettability of the ceramic particles by liquid Al is essential. To improve wettability of the solution, few elements such as Mg and Si are added into Al melt to incorporate the ceramic particles. The present investigation has been focussed on the utilization of abundant available industrial waste such as fly ash and bagasse ash in useful manner by dispersing it into Eutectic Al-Si alloy LM6 Containing 10.58% Si to produce composites by liquid casting route. The mechanical properties such as Brinell Hardness and Ultimate tensile strength has been investigated. The test results of the …
Effect Of Tig Welding Parameters On Strain-Age Cracking In Joining Nickel-Based Superalloy, Gtd-111 With Inconel 625, Athittaya Athiroj, Panyawat Wangyao
Effect Of Tig Welding Parameters On Strain-Age Cracking In Joining Nickel-Based Superalloy, Gtd-111 With Inconel 625, Athittaya Athiroj, Panyawat Wangyao
Journal of Metals, Materials and Minerals
Excellent mechanical properties at high temperature of nickel-based superalloys brought them to extensive application in severe operating conditions. However, the great mechanical properties deteriorate after long-term exposure to high temperature and it frequently causes failure of the component e.g. cracking. TIG welding is considered as an economical way to refurbish the minor damage component as replacement with new one is costly due to high material cost and complexity in manufacturing processes. Unfortunately, heat from welding that applies to the component may create new cracks during and after process from liquation and strain-age cracking. This phenomena is problem especially in precipitation-hardened …
Microstructure And X-Ray Diffraction Analysis Of Al-Cu Couples Diffused At High Temperature, Jaime Hinojosa-Torres, Juan Manuelaceves-Hernández, Andres Herrera-Vázquez, Victor Manuelcastaño-Meneses
Microstructure And X-Ray Diffraction Analysis Of Al-Cu Couples Diffused At High Temperature, Jaime Hinojosa-Torres, Juan Manuelaceves-Hernández, Andres Herrera-Vázquez, Victor Manuelcastaño-Meneses
Journal of Metals, Materials and Minerals
By employing a thermal field of 813 K, couples of Al with Cu were welded as consequence of the atomic diffusion. The periods of permanency inside the field were 200, 320 and 480 hours. After the periods of test, SEM observations show the formation of two contiguous plate likes (~15 to 30 micrometres, width) that they are in normal position to the concentration gradient. By utilizing elemental analyses and X-ray diffraction techniques one plate like was identified as the h2 phase (CuAl) and the other one as the q phase (CuAl2) of the aluminium-copper system. Immediate to the q plate …
Microstructure Based Finite Element Simulation Of Jco Forming Process For Pipeline X65, Wut Thianngoen, Saranya Kingklang, Vitoon Uthaisangsuk
Microstructure Based Finite Element Simulation Of Jco Forming Process For Pipeline X65, Wut Thianngoen, Saranya Kingklang, Vitoon Uthaisangsuk
Journal of Metals, Materials and Minerals
In recent years, strong increases in energy demand have become the most important issue in every section. High strength pipeline steels make large contribution to cost reduction for fuel transportation in oil and gas industries due to their great combination of optimal strength and toughness properties. Mechanical properties of pipeline steel tubes are significantly influenced by their microstructure characteristics, which in turn are controlled by the production. In this work, the JCO forming process of gas pipeline tube made of hotrolled steel grade X65 with ferrite/pearlite microstructure was investigated by means of a FE multiscale modeling approach. Three different scales …
Effect Of Temperature Dropping During Solution Treatment In Rejuvenation Heat Treatment On Final Microstructures Of Udimet 520, Kritsayanee Saelor, Panyawat Wangyao
Effect Of Temperature Dropping During Solution Treatment In Rejuvenation Heat Treatment On Final Microstructures Of Udimet 520, Kritsayanee Saelor, Panyawat Wangyao
Journal of Metals, Materials and Minerals
Udimet 520 is a low precipitation hardened nickel-based superalloy, which is made to be turbine blades at high temperature. After long-term service, the microstructure of the turbine blades could be degraded, then the mechanical properties are worse than the new ones. The rejuvenation heat treatment of degraded turbine blades, which are made of cast Udimet 520, is following by solution treatment at 1,121C / 4 hours and then double aging processes, which include primary aging at 843 C / 24 hours and secondary aging at 760 C / 16 hours, respectively.However, in practical reheat treatment processes, the temperature during solution …
Mechanical Properties Of Interpenetrating Phase Composites Using Open-Cell Al Foams With Natural Rubber And Polyethylene, Kunmutta Angamnuaysiri, Seksak Asavavisithchai
Mechanical Properties Of Interpenetrating Phase Composites Using Open-Cell Al Foams With Natural Rubber And Polyethylene, Kunmutta Angamnuaysiri, Seksak Asavavisithchai
Journal of Metals, Materials and Minerals
Interpenetrating phase composites (IPCs) were produced by conventional casting process, in vacuum atmosphere, using open-cell Al foams as matrix, and filled with either natural rubber or polyethylene. Mechanical properties of IPCs strongly depends on types of polymeric phases. It is found that the IPCs with polyethylene show an increase in compressive strength as well as failure strain. However, a large decrease of compressive strength is observed in the IPCs with natural rubber, as a result of cracks along the interface between Al foam and the rubber. These cracks are distributed throughout foam structure in the IPCs.
Processing Of Nano Fillers In Nitrile Rubber A Novel Technique, Abitha V. K., Ajay Vasudeo Rane, K. Rajkumar
Processing Of Nano Fillers In Nitrile Rubber A Novel Technique, Abitha V. K., Ajay Vasudeo Rane, K. Rajkumar
Journal of Metals, Materials and Minerals
Dispersion of various nano fillers like Nano silica, nano clay, Nano TiO2, etc has been attempted in NBR rubbers using new technique of dispersion. Liquid NBR is taken as dispersion media for nano fillers in polymer matrix and polymer nano composites were characterized by Rubber Process Analyzer [RPA-2000, USA]. The dispersion of the nano fillers were investigated by XRD, SEM-EDS. The effect of increasing nano- fillers on mechanical properties like tensile strength, modulus and Elongation at break was studied. Hot air ageing of polymer nano composites was also studied.Dispersion of various nano fillers like Nano silica, nano clay, Nano TiO2, …
Sandwich-Type Cobalt Tungstophosphate: Synthesis, Characterization And Catalytic Activity, Wimonrat Trakarnpruk, Aphiwat Wannatem, Jutatip Kongpeth
Sandwich-Type Cobalt Tungstophosphate: Synthesis, Characterization And Catalytic Activity, Wimonrat Trakarnpruk, Aphiwat Wannatem, Jutatip Kongpeth
Journal of Metals, Materials and Minerals
odium tungstophosphate, Na9[HPW9O34].7H2O was synthesized by reaction in aqueous solution of sodium tungstate, phosphoric acid and acetic acid. It was used as a precursor for synthesis of sandwich-type cobalt tungstophosphate, K10[Co4(H2O)2(PW9O34)2].20H2O by reacting with cobalt chloride and potassium acetate. The potassium ion can be exchanged with tetrabutylammonium bromide. The characterization was carried out by means of elemental analysis, FT-IR, UV-vis diffuse reflectance spectroscopy (DR-UV-vis). The sandwich-type cobalt tungstophosphate was used to catalyze oxidation of cyclooctane with H2O2 as oxidant in absence and presence of phase transfer agent. The experimental results showed that with phase transfer agent, the sandwich-type cobalt tungstophosphate …
Effect Of Heating Rate On Morphology Of Anti-Reflective Tio2 Film Coated By Sol-Gel With Polyethylene Glycol, Kumpol Leelaruedee, Patama Visuttipitukul, Niti Yongvanich
Effect Of Heating Rate On Morphology Of Anti-Reflective Tio2 Film Coated By Sol-Gel With Polyethylene Glycol, Kumpol Leelaruedee, Patama Visuttipitukul, Niti Yongvanich
Journal of Metals, Materials and Minerals
This research studies formation of thin porous TiO2 film prepared by Sol-gel process with spin coating. Polyethylene glycol with molecular weight of 6,000 g/mol (6kPEG) was used as a pore generating agent. The TiO2 film was calcination at 450C for 1 hour with different heating rate. It was found that heating rate strongly affects on morphology of TiO2 film due to grain coalescence. The lower heating rate tends to cause more coalescence resulting in coarsening of both grain and pore size. With higher heating rate, film density can be increased due to lower number of pores. On the other hand, …
Effect Of Temperature Dropping During Solution Treatment During Rejuvenation Heat Treatment On Final Microstructures In Cast Nickel Base Superalloy, Grade Inconel-738, Aimamorn Promboopha, Sureerat Polsilapa, Panyawat Wangyao
Effect Of Temperature Dropping During Solution Treatment During Rejuvenation Heat Treatment On Final Microstructures In Cast Nickel Base Superalloy, Grade Inconel-738, Aimamorn Promboopha, Sureerat Polsilapa, Panyawat Wangyao
Journal of Metals, Materials and Minerals
Generally, the rejuvenation heat treatment of degraded turbine blades, which were made of cast nickel based superalloy, Grade Inconel 738, usually consist of solution treatment condition with temperature range of 1125C- 1205C for 3 hours and then following with double aging processes, which include primary aging at 1055C for 1 hour and secondary aging at 845C for 24 hours. However, in practical working conditions of reheat treatment processed, the possible change of temperature during solution treatment can be obtained by error or malfunction of heating furnace, which usually provides the temperature dropping down. To simulate this effect, the dropping temperature …
Properties Of Binary And Ternary Composites Of Polypropylene Containing Soybean Oil-G-Chitosan And Hydrophobic Phosphonated Silica, Natthaphop Suwannamek, Kawee Srikulkit
Properties Of Binary And Ternary Composites Of Polypropylene Containing Soybean Oil-G-Chitosan And Hydrophobic Phosphonated Silica, Natthaphop Suwannamek, Kawee Srikulkit
Journal of Metals, Materials and Minerals
PP/soybean oil-g-chitosan binary composite, PP/hydrophobic phosphonated silica binary composite, and PP/chitosan/hydrophobic phosphonated silica ternary composite were prepared. Firstly, the preparation of soybean oil-g-chitosan was carried out by surface hydrophobicity modification of chitosan powder with soybean oil maleate and hydrophobicallyphosphonated silica was prepared by silanization of phosphonated silica with hexadecyltrimethoxysilane (an organosilane). Binary and ternary composites were prepared using a twin screw extruder. It was found that soybean oil-g-chitosan not only caused a decrease in tensile strength but also enhanced flexibility of PP due to its plasticization effect. In the opposite direction, the addition of hydrophobic phosphonated silica resulted in an …
Extraction And Characterization Of Cellulose Nanocrystals Produced By Acid Hydrolysis From Corn Husk, Piyaporn Kampeerapappun
Extraction And Characterization Of Cellulose Nanocrystals Produced By Acid Hydrolysis From Corn Husk, Piyaporn Kampeerapappun
Journal of Metals, Materials and Minerals
Corn husk is one of the agricultural residues represent abundant, inexpensive, and readily available source of renewable lignocellulosic biomass. Cellulose nanocrystals (CNCs) were extracted from corn husk by alkali and bleaching treatments followed by sulfuric acid hydrolysis treatment. The material obtained after each stage of the treatments was characterized. Morphological investigation was carried out using scanning electron microscope (SEM) and transmission electron microscopy (TEM). Fourier transform infrared (FTIR) spectroscopy showed the progressive removal of non-cellulosic materials. The crystallinity of corn husk and CNCs was also investigated using X-ray diffraction analysis (XRD). The highest crystallinity index value of this study is …
Preparation And Characterization Of Epoxidized Natural Rubber And Epoxidized Natural Rubber/Carboxylated Styrene Butadiene Rubber Blends, Saowaroj Chuayjuljit, Thongchai Nutchapong, Onusa Saravari, Anyaporn Boonmahitthisud
Preparation And Characterization Of Epoxidized Natural Rubber And Epoxidized Natural Rubber/Carboxylated Styrene Butadiene Rubber Blends, Saowaroj Chuayjuljit, Thongchai Nutchapong, Onusa Saravari, Anyaporn Boonmahitthisud
Journal of Metals, Materials and Minerals
In this study, epoxidized natural rubber (ENR) with 30 mol % epoxidation (ENR-30) was first prepared from natural rubber (NR) latex via in situ performic epoxidation using 0.5 M hydrogen peroxide and 0.75 M formic acid at 50C for 4 h. The prepared ENR-30 was blended with three different loadings of carboxylated styrene butadiene rubber (XSBR) (10, 20 and 30 wt%) in the latex stage. All ENR-30/XSBR blends had longer scorch time and cure time than neat ENR-30 as examined on a moving die rheometer. The tensile properties (tensile strength, modulus at 300% strain and elongation at break), thermal stability …
Peroxidase Inhibition Assay For The Detection Of Some Thiols By Carbon Screen Printed Electrodes Based On Square Wave Voltammetry, Wischada Jongmevasna, Orawon Chailapakul, Manchumas Hengsakul Prousoontorn
Peroxidase Inhibition Assay For The Detection Of Some Thiols By Carbon Screen Printed Electrodes Based On Square Wave Voltammetry, Wischada Jongmevasna, Orawon Chailapakul, Manchumas Hengsakul Prousoontorn
Journal of Metals, Materials and Minerals
Cassava peroxidase (CSP) from leaves of cultivar KU50 was used as an alternative peroxidase for the electrochemical detection of thiram and thiourea.Square-wave voltammetry (SWV) incorporated with screen-printed carbon electrode was applied for the investigation of peroxidase activity. It was based on the measurement of 3, 3-diaminobenzidine (DAB) electro active product catalyzed by CSP and horseradish peroxidase (HRP) in 0.04 M Britton-Robinson buffer, pH 6, containing urea hydrogen peroxide in 96-well microplate. The reaction mixture in the presence of either thiourea or thiram was performed in order to study their effects on DAB oxidation catalyzed by both peroxidases. From the result …
An Updated Mineralogical Analysis Of Sediment Materials From Three Therapeutically-Used Peruvian Lagoons, Maria Luisa Ceron Loayza, Jorge Aurelio Bravo Cabrejos, F. A. R. Navarro, F. Urcia Ch.
An Updated Mineralogical Analysis Of Sediment Materials From Three Therapeutically-Used Peruvian Lagoons, Maria Luisa Ceron Loayza, Jorge Aurelio Bravo Cabrejos, F. A. R. Navarro, F. Urcia Ch.
Journal of Metals, Materials and Minerals
Herein, we determine the elemental, structural and mineralogical characterization of samples collected in three Peruvian lagoons; likewise, we investigate the physical and chemical properties of their fractions, both clay and magnetic. These lagoons are located in the Chilca District, Cate Province, southern Lima Region, Peru; their morphology has been altered since we carried out a previous study five years ago. The physical analytical techniques we used were energy dispersive X-ray fluorescence (EDXRF); X-ray diffractometry (XRD); and transmission Msbauer spectroscopy (TMS), at room and liquid-helium temperatures, and at low and high velocities. The results indicate that dolomite is the main clayey …