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Dissertations / Theses on the topic 'Metallurgical and Materials Science'

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Published: 6 September 2023

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1

Jenkins, Neil Travis 1973. "Chemistry of airborne particles from metallurgical processing." Thesis, Massachusetts Institute of Technology, 2003. http://hdl.handle.net/1721.1/17033.

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Thesis (Ph.D.)--Massachusetts Institute of Technology, Dept. of Materials Science and Engineering, 2003.<br>Vita.<br>Includes bibliographical references.<br>Airborne particles fall into one of three size ranges. The nucleation range consists of nanoparticles created from vapor atom collisions. The decisive parameter for particle size and composition is the supercooling of the vapor. The accumulation range, which comprises particles less than 2 micrometers, consists of particles formed from the collision of smaller primary particles from the nucleation range. The composition of agglomerates and
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2

King, Matthew Joseph. "Control and optimization of metallurgical sulfuric acid plants." Diss., The University of Arizona, 1999. http://hdl.handle.net/10150/284812.

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The pyrometallurgical processing of copper concentrates produces SO₂-bearing offgas. SO₂ in the offgas is catalytically oxidized to SO₃ and absorbed into a ∼98.5% H₂SO₄-H₂O mixture in a sulfuric acid plant. This research provides an analysis of a copper smelter sulfuric acid plant and discusses the control and optimization necessary to attain the following goals: (a) minimize smelter SO₂ emissions; (b) maximize acid plant capacity and availability. The objectives of this work are to: (a) prepare mathematical descriptions of sulfuric acid plant operations; compare the mathematical predictions w
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3

Bernardis, Sarah. "Engineering impurity behavior on the micron-scale in metallurgical-grade silicon production." Thesis, Massachusetts Institute of Technology, 2012. http://hdl.handle.net/1721.1/101457.

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Thesis: Ph. D., Massachusetts Institute of Technology, Department of Materials Science and Engineering, 2012.<br>This electronic version was submitted by the student author. The certified thesis is available in the Institute Archives and Special Collections.<br>Cataloged from student-submitted PDF version of thesis.<br>Includes bibliographical references (pages 127-137).<br>Impurities are detrimental to silicon-based solar cells. A deeper understanding of their evolution, microscopic distributions, and oxidation states throughout the refining processes may enable the discovery of novel refini
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4

Papakirillou, Ismini. "A metallurgical study of West African iron monies from Cameroon and Liberia." Thesis, Massachusetts Institute of Technology, 2009. http://hdl.handle.net/1721.1/55263.

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Thesis (S.M.)--Massachusetts Institute of Technology, Dept. of Materials Science and Engineering, 2009.<br>Cataloged from PDF version of thesis.<br>Includes bibliographical references (p. 200-202).<br>The aim of this thesis is to make a contribution to the study of West African iron monies through examination and analysis of a group of these objects in the collection of the Peabody Museum of Archaeology and Ethnology at Harvard University. The selection of objects from the collection includes five distinct types, representing different sizes and shapes that have been identified as monies/excha
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5

Cooney, Elizabeth Myers. "Bronze metallurgy in Iron Age central Europe : a metallurgical study of Early Iron Age bronzes from Stična, Slovenia." Thesis, Massachusetts Institute of Technology, 2007. http://hdl.handle.net/1721.1/39480.

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Thesis (S.M.)--Massachusetts Institute of Technology, Dept. of Materials Science and Engineering, 2007.<br>This electronic version was submitted by the student author. The certified thesis is available in the Institute Archives and Special Collections.<br>Includes bibliographical references (v. 2, p. 375-377).<br>The Early Iron Age (750-450 BCE) marks a time in the European Alpine Region in which cultural ideologies surrounding bronze objects and bronze production were changing. Iron was becoming the preferred material from which to make many utilitarian objects such as weapons and agricultur
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6

Payton, Eric John. "Characterization and Modeling of Grain Coarsening in Powder Metallurgical Nickel-Based Superalloys." The Ohio State University, 2009. http://rave.ohiolink.edu/etdc/view?acc_num=osu1250265477.

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7

Jönsson, Martin. "The Atmospheric Corrosion of Magnesium Alloys : Influence of Microstructure and Environments." Doctoral thesis, KTH, Kemi, 2007. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-4545.

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The low density and high specific strength of magnesium alloys have created a great deal of interest in the use of these alloys in the automotive and aerospace industries and in portable electronics. All of these industries deal with applications in which weight is extremely important. However, an obstacle to overcome when using magnesium alloys in engineering applications are their unsatisfactory corrosion properties. This thesis is devoted to the atmospheric corrosion of the two magnesium alloys AZ91D and AM50, in particular the ways the microstructure and exposure parameters of these alloys
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8

Duffey, Matthew James. "Metallurgical Characterization and Weldability Evaluation of Ferritic and Austenitic Welds in Armored Steels." The Ohio State University, 2016. http://rave.ohiolink.edu/etdc/view?acc_num=osu1460910681.

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9

Boster, Connor M. Boster. "Metallurgical Characterization and Testing of Dissimilar Metal Welds for Service in Hydrogen Containing Environments." The Ohio State University, 2018. http://rave.ohiolink.edu/etdc/view?acc_num=osu1524179509481363.

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10

Semykina, Anna. "Recovery of iron and manganese values from metallurgical slags by the oxidation route." Doctoral thesis, KTH, Materialens processvetenskap, 2010. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-24534.

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In the modern practice, a sustainable development strategy in a domain of wasteutilization is shifting its focus from a general completeness of recycling to a morespecific attention to efficiently utilize elements in the wastes. This is well-illustrated bythe steelmaking slag industries. The major waste product from the steelmaking practiceis slag and its main constituents are: CaO, SiO2, Al2O3, MnO, FeO and so on. The mainfield of application for the steelmaking slags is civil engineering, especially for road andwaterway construction. However, a significant amount of the slag remains in the d
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11

Muwanguzi, Abraham Judah Bumalirivu. "Characterisation of Muko iron ores (Uganda( for defferent routes of iron production." Licentiate thesis, KTH, Materialvetenskap, 2010. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-25037.

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Iron and its products, especially the various forms of steel, have been and still are a vital material in many sectors of life. It is utilized in many industrial activities ranging from production of heavy duty mechanical equipment to light electrical appliances and home appliances. With the world‟s iron ore consumption estimated to stand at 1.3 billion tonnes by 2025, exploitation of any existing natural deposits is of increasing importance to meet the demands of the expanding world economy. Large deposits of iron ore exist in Uganda in the eastern (Tororo) regions and south-western (Kisoro-K
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12

Zhang, Zhi. "A study of flow fields during filling of a sampler." Licentiate thesis, KTH, Materials Science and Engineering, 2009. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-10693.

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<p>More and more attention has been paid to decreasing the number and size of non-metallic inclusions existing in the final products recently in steel industries. Therefore, more efforts have been made to monitor the inclusions' size distributions during the metallurgy process, especially at the secondary steelmaking period. A liquid sampling procedure is one of the commonly applied methods that monitoring the inclusion size distribution in ladles, for example, during the secondary steelmaking. Here, a crucial point is that the steel sampler should be filled and solidified without changing the
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13

Kero, Ida. "Ti3SiC2 synthesis by powder metallurgical methods." Licentiate thesis, Luleå tekniska universitet, Materialvetenskap, 2007. http://urn.kb.se/resolve?urn=urn:nbn:se:ltu:diva-17858.

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The MAX phases constitute a group of ternary ceramics which has received intense attention over the last decade due to their unique combination of properties. The Ti3SiC2 is the most well studied MAX phase to date and it has turned out to be a promising candidate for high temperature applications. It is oxidation resistant, refractory and not susceptible to thermal shock, while at the same time it can be machined with conventional tools which is of great technological importance. Most attempts to synthesize bulk Ti3SiC2 have involved pure titanium in the starting powder mixtures, but Ti powder
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14

Wang, Haijuan. "Investigations on the Oxidation of Iron-chromium and Iron-vanadium Molten Alloys." Doctoral thesis, KTH, Materialens processvetenskap, 2010. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-12955.

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With the progress of high alloy steelmaking processes, it is essential to minimize the loss of valuable metals, like chromium and vanadium during the decarburization process, from both economic as well as environmental view points. One unique technique to realize this aim, used in the present work, is the decarburization of high alloy steel grades using oxygen with CO2 in order to reduce the partial pressure of oxygen. In the present work, the investigation on the oxidation of iron-chromium and iron-vanadium molten alloys under CO2-O2 mixtures was carried out and presented in this dissertation
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15

Donald, Jeffrey Richard. "Surface interactions between non-ferrous metallurgical slags and various refractory materials." Thesis, National Library of Canada = Bibliothèque nationale du Canada, 1997. http://www.collectionscanada.ca/obj/s4/f2/dsk2/ftp02/NQ27913.pdf.

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16

Rigual, David Andrés. "Metallurgical characterization of self catalytic structural materials for sulfuric acid decomposition." Thesis, Massachusetts Institute of Technology, 2005. http://hdl.handle.net/1721.1/34654.

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Thesis (S.M.)--Massachusetts Institute of Technology, Dept. of Nuclear Engineering, 2005.<br>Includes bibliographical references (p. 276-279).<br>Eight heats of material with base alloy chemistries of Alloys 800 HT or 617 with platinum additions of 2, 5, 15, or 30 wt% have been characterized according to their microstructural features. The goals of characterization were to determine metallurgical stability for service as self-catalytic structural materials. The results presented herein will be useful to the development of a material for the construction of a heat exchanger designed for sulfuri
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17

Andersson, Emil. "Online Metallurgical Mass Balance and Reconciliation." Thesis, Umeå universitet, Institutionen för fysik, 2021. http://urn.kb.se/resolve?urn=urn:nbn:se:umu:diva-185252.

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In mineral processing, one of the most important and versatile separation methods is flotation. Flotation utilizes the different surface properties of the valuable minerals in the ore to separate them from the less valuable gangue material in the ore. Crushed and ground ore is mixed with water and fed into flotation tanks. In the flotation tanks, the particles of valuable mineral are made hydrophobic. That way, they can be floated by attaching to air bubbles and gather on top of the flotation tank as froth. This froth, containing higher concentrations of valuable mineral, is recovered and then
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18

Ma, Taoran. "Powder-metallurgical processing and phase separation in ternary transition metal carbides." Doctoral thesis, KTH, Materialvetenskap, 2017. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-207839.

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Ternary transition metal cubic carbides have high hardness and are potential carbides in cemented carbide and cermet tools, as well as hard coatings used to improve metal cutting performance. In the present work, (Ti,Zr)C, (V,Nb)C, and (V,Ta)C ternary cubic carbides were synthesized using traditional powder-metallurgical methods. The effect of synthesis temperature and starting materials on synthesis is investigated, and the microstructure evolution during aging is studied. (Ti,Zr)C was found to decompose into lamellae upon aging at the temperature range from 1150 to 1800 °C. A similar microst
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19

Stella, Piergiorgio. "Powder metallurgy: investigation of metallurgical and technological aspects and potential applications for critical components of turbomachineries." Doctoral thesis, Università degli studi di Trento, 2016. https://hdl.handle.net/11572/369124.

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The application of powder metallurgy (PM) technologies to the manufacturing of Oil & Gas turbomachineries’ components was investigated in the course of research collaboration with the Material and Processes Engineering Department of General Electric Oil & Gas (Italy). The thesis focused on the study of the pressure-assisted Hot Isostatic Pressing technology for the processing of the corrosion resistant Ni-base alloy N07626. The densification behaviour of the N07626 metal powder in condition of pressure assisted sintering was investigated by experiments conducted on a small scale by uniaxial
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20

Stella, Piergiorgio. "Powder metallurgy: investigation of metallurgical and technological aspects and potential applications for critical components of turbomachineries." Doctoral thesis, University of Trento, 2016. http://eprints-phd.biblio.unitn.it/1688/1/PhD_tesi_STELLA.pdf.

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The application of powder metallurgy (PM) technologies to the manufacturing of Oil & Gas turbomachineries’ components was investigated in the course of research collaboration with the Material and Processes Engineering Department of General Electric Oil & Gas (Italy). The thesis focused on the study of the pressure-assisted Hot Isostatic Pressing technology for the processing of the corrosion resistant Ni-base alloy N07626. The densification behaviour of the N07626 metal powder in condition of pressure assisted sintering was investigated by experiments conducted on a small scale by uniaxial ho
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21

Moosberg-Bustnes, Helena. "Fine particulate by-products from mineral and metallurgical industries as filler in cement-based materials /." Luleå, 2003. http://epubl.luth.se/1402-1544/2003/36.

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22

Saeed, Mohazzam. "Exploring effects of hydrodynamic flotation variables on their respective metallurgical responses through laboratory scaling up." Thesis, Luleå tekniska universitet, Institutionen för samhällsbyggnad och naturresurser, 2021. http://urn.kb.se/resolve?urn=urn:nbn:se:ltu:diva-87078.

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To meet the increasing demand for raw materials, higher throughput of mineral separation through froth flotation is becoming important. This higher throughput can be achieved by increasing the size of flotation equipment termed scaling up. Flotation performance is greatly affected by the size of flotation machines and remains an important research area to correlate flotation behavior between small and larger flotation machines. The Outotec GTK LabCell®, a mechanical flotation machine, has been used as a benchmark for many industrial pre-feasibility studies around the world for the past decade.
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23

Lotfian, Samira. "Alternative reducing agents in metallurgical processes : Experimental study of thermal characterization of shredder residue material." Licentiate thesis, Luleå tekniska universitet, Mineralteknik och metallurgi, 2016. http://urn.kb.se/resolve?urn=urn:nbn:se:ltu:diva-26641.

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Coal used in metallurgical processes can participate in reduction reactions to produce metals and alloys from oxides. Base metals production leads to generation of slag, which contains valuable metals that can be recovered and recycled. There are several options to treat the slag, depending on the metal content in the slag. One is slag fuming, which is a well-established process that is traditionally used to vaporize zinc from zinc containing slags, mainly lead blast furnace slag, but is applied in a few plants for copper smelting slags. In this process reduction is achieved using pulverized c
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24

Erkers, Louise, and Felicia Fröjd. "Metallurgical Analysis of Viking Age Amulet Rings : and Comparison With Cutting Tools." Thesis, KTH, Materialvetenskap, 2017. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-209778.

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Artefacts known as amulet rings, a kind of Viking age jewellery, have often been encountered during archaeological excavations of Viking Age sites. The rings do not appear to have any practical use, but are rather considered to be of cultural or religious importance. Their exact function is however unclear, as are the details regarding the production and material choices for the rings.This study mainly examines the microstructure of samples from Viking Age amulet rings found in Dalecarlia, Sweden. To be able to conclude how much effort that was put into the rings a comparison with medieval cut
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25

Martello, Robert 1968. "Paul Revere's metallurgical ride : craft and proto-industry in early America." Thesis, Massachusetts Institute of Technology, 2000. http://hdl.handle.net/1721.1/109637.

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26

Nordgren, Eric. "The effect of metallurgical structure on the chloride-induced corrosion of archaeological wrought iron." Thesis, Cardiff University, 2016. http://orca.cf.ac.uk/97535/.

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Archaeological wrought iron artefacts are subject to damaging corrosion while in the burial environment and when subjected to environmental changes after excavation. The role of water, oxygen, and chloride corrosion accelerators are central to iron corrosion processes. Intrinsic factors such as the amount and distribution of slag in wrought iron may also play a role in corrosion processes. This study examined a range of factors that impact on understanding conservation desalination treatments to mitigate corrosion by removing chlorides. While examining the effect of slag on corrosion rate and
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27

Ogwuda, Olisanwendu Ikechukwuka. "Materials science appraisal of recycled construction materials for roadways." Thesis, Abertay University, 2007. https://rke.abertay.ac.uk/en/studentTheses/70d295b3-60d9-427e-a012-c9cc05ac83e1.

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This thesis reports on a materials science appraisal for recycled construction materials in roadways, that supports engineering decision-making. Inconsistent performance criteria for roadway materials and the variable nature of material source have prompted the need for this research. The aim of the study is to investigate the application of a materials science appraisal to recycled construction materials for use in roadways. The investigation is undertaken through a literature review of roadways, conceptual development of the materials science appraisal methodology, and demonstration of the a
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28

Fischbein, Ellinor, and Felicia Larsson. "Metallurgical analysis of some osmund iron from Sweden and Estonia : A short historical review of medieval iron production and export." Thesis, KTH, Materialvetenskap, 2021. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-298414.

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During the Middle Ages, Sweden was a coveted exporter of high-quality iron in Europe. Bloomery furnaces could have produced osmund iron. However, most osmund iron was produced in blast furnaces. The iron was then treated in the finery process and cut into pieces. Previous studies establish osmund iron’s definition regarding properties, microstructure and trace elements. They were often slag-rich and varied greatly in carbon content, proportion of inclusions, corrosion and microstructure. The report examined osmund iron as related to medieval iron production, exports and quality. This was done
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Forclaz, A. "Variational methods in materials science." Thesis, University of Oxford, 2002. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.249532.

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Three problems are being investigated in this thesis. The first two relate to the modelling and analysis of martensitic phase transitions, while the third is concerned with some mathematical tools used in this setting. After a short introduction (Chapter 1) and overviews of the calculus of variations and martensitic phase transformations (Chapter 2), the research part of this thesis is divided into three chapters. We show in Chapter 3 that for the two wells $\mathrm{SO}(3)U$ and $\mathrm{SO}(3)V$ to be rank-one connected, where the $3\times 3$ symmetric positive definite $U$ and $V$ have the s
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30

Rouet-Leduc, Bertrand. "Machine learning for materials science." Thesis, University of Cambridge, 2017. https://www.repository.cam.ac.uk/handle/1810/267987.

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Machine learning is a branch of artificial intelligence that uses data to automatically build inferences and models designed to generalise and make predictions. In this thesis, the use of machine learning in materials science is explored, for two different problems: the optimisation of gallium nitride optoelectronic devices, and the prediction of material failure in the setting of laboratory earthquakes. Light emitting diodes based on III-nitrides quantum wells have become ubiquitous as a light source, owing to their direct band-gap that covers UV, visible and infra-red light, and their very h
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31

Hartmann, Markus. "Lattice models in materials science." Doctoral thesis, Humboldt-Universität zu Berlin, Mathematisch-Naturwissenschaftliche Fakultät I, 2006. http://dx.doi.org/10.18452/15432.

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In der vorliegenden Arbeit wurden drei unabhängige Problemfelder moderner biophysikalischer und materialwissenschaftlicher Forschung untersucht: Diffusion in binären Legierungen, der Umbauprozess in trabekulärem Knochen und die Voraussage mechanischer Eigenschaften, insbesonders der Biegesteifigkeit, selbstorganisierender, amphiphiler Membrane. Für alle drei Problemfelder wurden Gittermodelle gewählt, um ausgesuchte Fragestellungen zu untersuchen. Für den Fall der Diffusion in Legierungen war dies, inwieweit sich der Diffusionprozess, der sich auf atomarer Ebene als diskrete Platztäusche zwisc
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Perez, Demydenko Camilo. "Static and dynamic disorder in nanocrystalline materials." Doctoral thesis, Università degli studi di Trento, 2019. https://hdl.handle.net/11572/368145.

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Peak profiles in X-ray Diffraction (XRD) patterns from nanocrystalline materials are affected by static and dynamic disorder which is specific of the size and shape of the nanocrystalline domains. Owing to their intrinsic differences, the two types of disorder can be separated, providing independent information from the modelling of the XRD patterns. In the present thesis a model for the static strain created by the nanoparticle surface is proposed. The model is built within the frame of the Whole Powder Pattern Modelling (WPPM) approach for XRD line profile analysis, developed at the Universi
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Perez, Demydenko Camilo. "Static and dynamic disorder in nanocrystalline materials." Doctoral thesis, University of Trento, 2019. http://eprints-phd.biblio.unitn.it/3636/1/CAMILO_PEREZ_DEMYDENKO_thesis_PhD.pdf.

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Peak profiles in X-ray Diffraction (XRD) patterns from nanocrystalline materials are affected by static and dynamic disorder which is specific of the size and shape of the nanocrystalline domains. Owing to their intrinsic differences, the two types of disorder can be separated, providing independent information from the modelling of the XRD patterns. In the present thesis a model for the static strain created by the nanoparticle surface is proposed. The model is built within the frame of the Whole Powder Pattern Modelling (WPPM) approach for XRD line profile analysis, developed at the Universi
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34

Aldén, Rickard. "Metallurgical investigation in weldability of Aluminium Silicon coated boron steel with different coating thickness." Thesis, KTH, Materialvetenskap, 2015. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-171209.

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Hot-pressed aluminium and silicon coated boron steel is used in the car industry where high tensile strength is of great importance, such as in the safety cage of a car where deformation has to be kept to a minimum in case of a collision. After hot-pressing the AlSi-boron steel shows excellent properties with high tensile strength, minimal spring back and also shows good protection against corrosion. A thickness of the AlSi coating of 150 [g/m2] for AlSi coated boron steel is typically used by the car industry today. However the coating thickness would be desirable to be minimized to 80 [g/m2]
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Maguire, John F. "Contributions to materials science and engineering." Thesis, Ulster University, 2004. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.515891.

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Stoleriu, Iulian. "Integro-differential equations in materials science." Thesis, University of Strathclyde, 2001. http://oleg.lib.strath.ac.uk:80/R/?func=dbin-jump-full&object_id=21413.

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This thesis deals with nonlocal models for solid-solid phase transitions, such as ferromagnetic phase transition or phase separation in binary alloys. We discuss here, among others, nonlocal versions of the Allen-Cahn and Cahn-Hilliard equations, as well as a nonlocal version of the viscous Cahn-Hilliard equation. The analysis of these models can be motivated by the fact that their local analogues fail to be applicable when the wavelength of microstructure is very small, e. g. at the nanometre scale. Though the solutions of these nonlocal equations and those of the local versions share some co
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Behera, Balaram Bijayakumar, and Neeraj Vimal Prasad. "Erosion wear of materials." Thesis, 2007. http://ethesis.nitrkl.ac.in/4192/1/Erosion_Wear_of_Materials.pdf.

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Wear is damage to a surface as a result of relative motion with respect to another substance. One key point is that wear is damage and it is not limited to loss of material from the surface. However, loss of material is definitely one way in which a part can experience wear. Another way included in this definition is by movement of material without loss of mass. An example of this would be the change of geometry or dimension of a part as a result of plastic deformation (e.g., from repeated hammering). There is also a third mode implied, which is damage to a su
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Noecker, Fredrick F. II. "Metallurgical investigation into ductility dip cracking in nickel based alloys." 2007. http://gateway.proquest.com/openurl?url_ver=Z39.88-2004&rft_val_fmt=info:ofi/fmt:kev:mtx:dissertation&res_dat=xri:pqdiss&rft_dat=xri:pqdiss:3285743.

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Islam, Rashed Adnan. "Composition - microstructure - property relationships in dual phase bulk magnetoelectric composite." 2008. http://hdl.handle.net/10106/957.

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Dutta, Surajeet Kumar. "Study of the Chemical Composition and Energy value of Woody Biomass Species." Thesis, 2008. http://ethesis.nitrkl.ac.in/121/1/surajeet.pdf.

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In spite of its natural sources, India depends on other countries in terms of energy production, and a transfer from conventional fossil sources to sustainable energy sources is strongly necessary because due to the increasing demand of the energy. Among the sustainable energy sources, biomass is the subject of this study. The characteristics, logistic aspects, environmental aspects, economical, legal and technical aspects are investigated in order to show that the possible biomass co-firing is very important for the construction of economic, sustainable and environmentally friendly energy sys
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Mishra, Barun, and Sandeep Kumar Baliarsingh. "Kinetics of Iron Ore Reduction by Coal and Charcoal." Thesis, 2008. http://ethesis.nitrkl.ac.in/124/1/10404014.pdf.

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In the present investigation, an attempt has been done to study the simultaneous effects of the major processing variables on the extent of reduction of iron ore pellets surrounded by coal or charcoal fines in an externally heated cylindrical steel container (diameter 5cm and height 10cm) placed in muffle furnace. The project goal is to compare the reduction potential of coal and charcoal in reduction of iron ore pellets. Wood charcoal contains very low levels of gangue, sulphur and volatile matter therefore, presenting itself as a very desirable reductant for the reduction of iron ore. The va
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Krishnan, Tintula, and Subhram Keshary Singh. "Reduction Kinetics of iron ore pellets and the effect of Binders." Thesis, 2008. http://ethesis.nitrkl.ac.in/125/1/10404011.pdf.

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Reduction of Iron Ore Pellets with a particular percentage of binders i.e. 2% of Dextrine and 2% of Bentonite was carried out for the temperature range 900 to 1050°C. In reduction kinetic study the most satisfactory model was to taken, the slope of the initial linear region of fractional reduction vs. time curve was measured, which gives the rate constant (k). Ln k vs. 1/T plots were straight line from which Activation Energy was calculated. Pellets having different percentages of binders were reduced and compared to find the effect of binders
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Gaur, Ankur. "Effect of Strain Ageing On Welded or Nonwelded Low Carbon Steel." Thesis, 2009. http://ethesis.nitrkl.ac.in/1157/1/strain_ageing.pdf.

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An investigation has been performed on the strain ageing of welded and non-welded specimen of low carbon steel. It was determined that the low carbon steel were susceptible to strain ageing in interstitial solutes. The increase in yield strength, tensile strength and elongation because of strain ageing has been compared between welded and non-welded specimen. At high level of prestrain, the percentage loss in ductility was observed. Increase in the strain-ageing temperature the value of ΔY increased, increase the time of ageing has also got influence on value of ΔY. However the influence of te
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44

Arvind, K. "J-R Behaviour of 20MnMoNi55 Pressure Vessel Steel." Thesis, 2009. http://ethesis.nitrkl.ac.in/1395/2/bmdthesis.pdf.

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Material of Reactor Pressure Vessel (RPV) should have good fracture toughness to ensure safe operation of nuclear reactor. In order to be on safe side the fracture characteristics of RPV material have to be quantified. In this present work the fracture characteristics of 20MnMoNi55 steel – the material used for Indian PHWR – have been found using J-Integral test. The microstructures of the steel and its relevant mechanical properties such as hardness and tensile properties have been characterized. Monotonic J-R curves of the material have been determined in the temperature of and . Fracture
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45

Akarapu, Ashok. "Surface Property Modification of Copper by Nanocomposite Coating." Thesis, 2011. http://ethesis.nitrkl.ac.in/2778/1/Ashok_thesis_final.pdf.

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Copper has high electrical and thermal conductivities, good corrosion resistance at ambient temperature, excellent malleability/workability and reproducibility, apart from these it is cheap and abundantly available metal other than good conducting metals like Silver. But has poor mechanical properties such as hardness and wear resistance. Some applications like Contacts in electrical switches necessitate the improvements in the mechanical properties without much loss of electrical and thermal conductivities. Bulk modification / alloying have been tried but limitations in alloying and adversel
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46

Madhukar, Poloju. "Synthesis and Characterization of ZnO Nanostructures and Synthesis of Zn/Al2O3 Nanocomposite by Mechanical Alloying Route." Thesis, 2011. http://ethesis.nitrkl.ac.in/2785/1/madhukar_thesis.pdf.

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We report simple methods to synthesize Zinc oxide nanostructures, without using catalysis with less complicity. This was done by oxidation of zinc foil at various temperatures (200oC-1000oC) and various times (1-3h) and also we find that the nanostructures size and shape depends on heating rate, temperature and heating time. Apart from oxidation of zinc we also find zinc oxide nanostructures in Zn-C dry battery. This nanostructure is formed on inner surface of Zn container (which acts as anode). These nanostructures are formed due reaction between electrolyte (mixture composed of manganese (IV
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47

Verma, Preeti. "Ratcheting Fatigue Behaviour and Post-fatigue Tensile Properties of Commercial Aluminium." Thesis, 2011. http://ethesis.nitrkl.ac.in/2788/1/Final_thesis-Preeti.pdf.

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This investigation examines the ratcheting fatigue behaviour and post-fatigue tensile properties of commercial aluminium in annealed and normalised condition. Ratcheting is the phenomena of progressive accumulation of permanent deformation when a component is subjected to asymmetric cyclic loading which also causes variation in their mechanical properties. One set of commercial aluminium rods were annealed by soaking the as received rods at 200°C for 30 minutes prior to machining and other set were normalised up to same temperature with same soaking time. The microstructural examinations were
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48

Mallik, Manila. "Effect of microstructure on the indentation creep behaviour of 2.25Cr-1Mo and its comparison with modified 9Cr-1Mo ferritic steel." Thesis, 2011. http://ethesis.nitrkl.ac.in/2891/1/manila_final_thesis.pdf.

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2.25Cr-1Mo and modified 9Cr-1Mo are extensively used for super heater and reheater tube, header pipe in large-scale thermal and nuclear power plant. Some of the important factors to be considered for selection of such steels are resistance to creep deformation, resistance to environmental attack, corrosion resistance, oxidation resistance. Long term exposure at elevated temperature and pressure can result in microstructural changes. The effective strength, i.e. load bearing capacity of the tubes due to microstructural damages decreases. The failure occurs when it falls below a critical level d
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Nath, Chirag Ranjan, and Sanup Kumar Panda. "Fatigue Life Estimation of Pre-corroded 7075 Aluminium Alloy." Thesis, 2012. http://ethesis.nitrkl.ac.in/3211/1/Final_B.Tech_Thesis.pdf.

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Heterogeneous microstructures of aluminium alloys such as 7075, which are extensively used in aircraft structures, render them highly susceptible to corrosion. Corrosion can adversely affect aircraft structural integrity since fatigue cracks can nucleate from corrosion pits and grow at an accelerated rate in corrosive environment. During its service life, an aircraft structure typically experiences corrosion between flights and fatigue loading during flight, thus pointing to the need for quantifying the effects of ‘prior corrosion’ on fatigue behaviour. This phenomenon, termed corrosion-fatigu
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50

Gupta, Mukul, and Himanshu Baghel. "Reduction and Swelling Behaviour of Fired Iron Ore Pellets." Thesis, 2012. http://ethesis.nitrkl.ac.in/3268/1/Final_Edit.pdf.

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The present project work on “Reduction and Swelling Behaviour of Fired Iron Ore Pellets” was undertaken with a view to promote the effective utilization of iron ore and coal fines in sponge iron making. Presently, India has become the world leader in sponge iron production and the production of steel by DR-EAF route is increasing day by day. In the present project work, the effect of addition of concentrated sugarcane juice binder on the physical properties of fired iron ore pellets was investigated. The crushing strength and drop number were found to be maximum at 2% binder addition, followed
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