Defect and Diffusion Forum Vol. 353 | p. 4

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class="bread-crumbs-first" href="/DDF">Defect and Diffusion Forum</a><i class="inline-icon arrow-breadcrumbs"></i><span class="bread-crumbs-second">Defect and Diffusion Forum Vol. 353</span></div> <div class="page-name-block underline-begin"> <h1 class="page-name-block-text">Defect and Diffusion Forum Vol. 353</h1> </div> <div class="clearfix title-details"> <div class="papers-block-info col-lg-12"> <div class="row"> <div class="info-row-name normal-text-gray col-md-2 col-sm-3 col-xs-4"> <div class="row"> <p>DOI:</p> </div> </div> <div class="info-row-content semibold-middle-text col-md-10 col-sm-9 col-xs-8"> <div class="row"> <p><a href="https://doi.org/10.4028/www.scientific.net/DDF.353">https://doi.org/10.4028/www.scientific.net/DDF.353</a></p> </div> </div> </div> </div> <div id="titleMarcXmlLink" style="display: none" class="papers-block-info col-lg-12"> <div class="row"> <div class="info-row-name normal-text-gray col-md-2 col-sm-3 col-xs-4"> <div class="row"> <p>Export:</p> </div> </div> <div class="info-row-content semibold-middle-text col-md-10 col-sm-9 col-xs-8"> <div class="row"> <p><a href="/DDF.353/marc.xml">MARCXML</a></p> </div> </div> </div> </div> <div class="papers-block-info col-lg-12"> <div class="row"> <div class="info-row-name normal-text-gray col-md-2 col-sm-3 col-xs-4"> <div class="row"> <p>ToC:</p> </div> </div> <div class="info-row-content semibold-middle-text col-md-10 col-sm-9 col-xs-8"> <div class="row"> <p><a href="/DDF.353_toc.pdf">Table of Contents</a></p> </div> </div> </div> </div> </div> <div class="volume-tabs"> </div> <div class=""> <div class="volume-papers-page"> <div class="block-search-pagination clearfix"> <div class="block-search-volume"> <input id="paper-search" type="search" placeholder="Search" maxlength="65"> </div> <div class="pagination-container"><ul class="pagination"><li class="PagedList-skipToFirst"><a href="/DDF.353"><<</a></li><li class="PagedList-skipToPrevious"><a href="/DDF.353/3" rel="prev"><</a></li><li class="PagedList-ellipses"><a class="PagedList-skipToPrevious" href="/DDF.353" rel="prev">…</a></li><li><a href="/DDF.353/2">2</a></li><li><a href="/DDF.353/3">3</a></li><li class="active"><span>4</span></li><li><a href="/DDF.353/5">5</a></li><li><a href="/DDF.353/6">6</a></li><li class="PagedList-skipToNext"><a href="/DDF.353/5" rel="next">></a></li></ul></div> </div> <div class="block-volume-title normal-text-gray"> <p> Paper Title <span>Page</span> </p> </div> <div class="item-block"> <div class="item-link"> <a href="/DDF.353.159">Effect of Hydrogen on the Mechanical Behavior of API X70 Ageing</a> </div> <div class="item-link volume-authors"> <div class="semibold-middle-text"> Authors: M.A. Doñu Ruiz, N. López Perrusquia, J.A. Ortega Herrera, G. Urriolagoitia Calderón, V.J. Cortés Suárez, S. Rodríguez Gonzales </div> </div> <div id="abstractTextBlock395623" class="volume-info volume-info-text volume-info-description"> Abstract: The present work reports on the effect of hydrogen on the mechanical behavior of API 5L X70 ageing. Bending test specimens underwent solution treatment in an electric induction furnace at 1100°C for 30 min under argon atmosphere and water quenching and then ageing process for five temperatures in the range between 204 to 650°C for 30 min of time exposition and water quenching, respectively. The microstructural characterization was examined by scanning electron microscopy (SEM) and matrix samples ageing showed microstructures, acicular ferritic, polygonal ferrite, bainitic-ferrite, degenerate perlite and retained austenite and energy dispersive spectroscopy (EDS) evidencing the presence of carbonitrures type Nb, Ti, V (N, C). Hydrogen was introduced in a sample of bending test, through cathodic charging, applying a current density of 50 mA/cm<sup>2</sup>. Three point bend test was carry out on specimen on API X70 with and without hydrogen and the result showed a reduction of ductility and 65% of index of embrittlement (<i>I</i><i><sub>H</sub></i>). Also, samples undergoing ageing with hydrogen showed an increase in bending stress compared to a sample undergoing ageing without hydrogen, and the parameter (<i>I</i><i><sub>H</sub></i>) decreased in the range of 21 to 29% due to the formation of traps. The fracture surface of bend tested samples were examined using a SEM. </div> <div> <a data-readmore="{ block: '#abstractTextBlock395623', lines: 2, expandText: '...more', collapseText: '...less' }"></a> </div> <div class="page-number semibold-large-text"> 159 </div> </div> <div class="item-block"> <div class="item-link"> <a href="/DDF.353.165">Study of Hydrogen Permeation in a Micro-Alloyed Heat Treated Steel</a> </div> <div class="item-link volume-authors"> <div class="semibold-middle-text"> Authors: N. Lopez-Perrusquia, Marco Antonio Doñu-Ruíz, J.A. Ortega-Herrera, G. Urriolagoitia-Calderón, Yahir Edgar Vargas-Oliva </div> </div> <div id="abstractTextBlock395624" class="volume-info volume-info-text volume-info-description"> Abstract: In this work, an experimental research was conducted to determine of effects hydrogen permeation a micro-alloyed heat treatment steel in order to determine the mechanical properties of the material in this work [1]. Small specimens were taken from the micro-alloyed API-X60 steel. Moreover, by the technique of the three-point test according to ASTM 399-90, the load-displacement curves for each heat treatment with and without hydrogen permeation are determined. Likewise the samples were then mechanically tested for hardness by the technique of nanoindentation to obtain the elastic modulus and hardness of the studied specimens [2]. Scanning electron microscopy (SEM) determines the type of fracture; also EDS revealed the type of precipitate formed in the surface of the material [3]. The optical analysis showed the following microstructures; ferrite/pearlite, bainite/ferrite and martensite/retained-austenite [4]. Finally the experimental and statistical results showed effect of hydrogen permeation and heat treatment on the mechanical properties of the micro-alloyed API X-60 grade pipeline steel. </div> <div> <a data-readmore="{ block: '#abstractTextBlock395624', lines: 2, expandText: '...more', collapseText: '...less' }"></a> </div> <div class="page-number semibold-large-text"> 165 </div> </div> <div class="item-block"> <div class="item-link"> <a href="/DDF.353.171">Physical Chemistry of Integrated High-Magnesia Siderites Processing</a> </div> <div class="item-link volume-authors"> <div class="semibold-middle-text"> Authors: V. Kolokoltsev, S. Klochkovskii, A. Smirnov </div> </div> <div id="abstractTextBlock395625" class="volume-info volume-info-text volume-info-description"> Abstract: In the article the results of research are considered, that can be the basis for the modernization of the technology used at present time and can be applied for development of the fundamental principles of the complex processing technology of high-magnesian siderite satisfying the modern environmental requirements. Keywords: siderite ores, magnesium oxide, technology, leaching, carbonic acid </div> <div> <a data-readmore="{ block: '#abstractTextBlock395625', lines: 2, expandText: '...more', collapseText: '...less' }"></a> </div> <div class="page-number semibold-large-text"> 171 </div> </div> <div class="item-block"> <div class="item-link"> <a href="/DDF.353.177">Concentration Dependence of the Diffusion in the Ni/Cu System</a> </div> <div class="item-link volume-authors"> <div class="semibold-middle-text"> Authors: Zoltán Balogh, Mohammed Reda Chellali, Patrick Stender, Guido Schmitz </div> </div> <div id="abstractTextBlock395626" class="volume-info volume-info-text volume-info-description"> Abstract: Deviations from the Fickian-laws of diffusion in the case of concentration dependent diffusion coefficients and high composition gradients gain more and more acceptance nowadays. The cause of this phenomenon is the finite permeability of the atomic layers, or in other words “interface control”. The consequences are wide-spreading e.g. linear diffusion kinetics, deviations in the nucleation behavior of reaction products and kinetically determined interface shape in miscible alloys. Furthermore, if the original chemical interface is broader than the optimum width, even a sharpening of the interface by diffusion can be observed. Previous experiments proving these effects used more or less ideal specimens (e.g. single crystalline or amorphous samples with very flat interfaces) and some doubts can be raised whether these effects can be observed in a realistic specimen with a more complex grain structure. In this talk we will present the results of atom probe measurements on sputter deposited Ni/Cu multilayers (containing surface roughness, lattice defects, etc.). Samples with sharp and smeared Ni/Cu interfaces were produced and later annealed. We found an asymmetry on the interface width in the as-prepared specimens depending on the stacking order. After annealing this asymmetry vanished and remarkably the Cu/Ni interface sharpened by diffusion. After short diffusion time, the interface width became independent on the sample origin (sharp or smeared interface) proving the kinetic control of the interface. Atom probe tomography also allows the direct, local investigation of the grain boundary diffusion in any single grain boundaries. Surprisingly the best description of the shortcut transport can be achieved by assuming a concentration-independent grain boundary diffusion coefficient. </div> <div> <a data-readmore="{ block: '#abstractTextBlock395626', lines: 2, expandText: '...more', collapseText: '...less' }"></a> </div> <div class="page-number semibold-large-text"> 177 </div> </div> <div class="item-block"> <div class="item-link"> <a href="/DDF.353.183">Annealing Effects in Mg-Y-Zn Alloys Prepared by Powder Metallurgy and by Squeeze Casting</a> </div> <div class="item-link volume-authors"> <div class="semibold-middle-text"> Authors: Tomáš Kekule, Martin Vlach, Hana Kudrnová, Veronika Kodetova, Bohumil Smola, Ivana Stulíková </div> </div> <div id="abstractTextBlock395627" class="volume-info volume-info-text volume-info-description"> Abstract: Response to isochronal annealing up to 440°C was investigated in squeeze cast Mg2Y1Zn alloy and in the same alloy prepared by powder metallurgy and extrusion at 280°C (PM). Electrical resistivity measurements at 77 K and at room temperature after each annealing step and differential scanning calorimetry performed at various heating rates characterized phase changes proceeding during the heat treatments. Transmission and scanning electron microscopy and optical microscopy revealed ribbons of a long-period ordered structure and a relatively high density of stacking faults in grain interiors of the cast alloy having the grain size of ~50 μm. Well pronounced subgrains were observed in the PM prepared alloy. Secondary phase particles decorate grain boundaries in this alloy. Electrical resistivity response of the cast alloy to isochronal annealing up to 440°C shows three precipitation processes, whereas one significant process was revealed in the PM alloy. Activation energies of precipitation processes were determined. Microhardness exhibits good thermal stability in the whole temperature range in the cast alloy and up to 360°C in the PM alloy. </div> <div> <a data-readmore="{ block: '#abstractTextBlock395627', lines: 2, expandText: '...more', collapseText: '...less' }"></a> </div> <div class="page-number semibold-large-text"> 183 </div> </div> <div class="item-block"> <div class="item-link"> <a href="/DDF.353.189">Determination of Poroelastic Parameters of Porous Building Materials</a> </div> <div class="item-link volume-authors"> <div class="semibold-middle-text"> Authors: Jozefa Lukovičová, Gabriela Pavlendová, Ivan Baník, Rudolf Podoba </div> </div> <div id="abstractTextBlock395628" class="volume-info volume-info-text volume-info-description"> Abstract: Variations of sorption moisture in the capillary porous materials result in strong fluid-skeleton interactions due to molecular and surface forces, which produce moisture-induced deformation. The effect of moisture sorption on the non-linear elastic behavior of hygroscopic porous building materials has been experimentally investigated showing strong influence of moisture especially in the lower moisture content range. In the framework poroelasticity moisture influence on elastic behavior is described by two poroelastic coefficients, which present the fluid-skeleton coupling. This paper presents an application of the procedure for the determination of the coupling coefficients for medieval brick. </div> <div> <a data-readmore="{ block: '#abstractTextBlock395628', lines: 2, expandText: '...more', collapseText: '...less' }"></a> </div> <div class="page-number semibold-large-text"> 189 </div> </div> <div class="item-block"> <div class="item-link"> <a href="/DDF.353.193">Comparative Study of CO<sub>2</sub> Absorption in Aqueous Mixtures of Methyldiethanolamine (MDEA) and Methanol, Focusing on the Temperature and Concentration Influence over the Absorption Rate</a> </div> <div class="item-link volume-authors"> <div class="semibold-middle-text"> Authors: F.J. Tamajón, Estrella Álvarez, F. Cerdeira, M.E. Vázquez </div> </div> <div id="abstractTextBlock395629" class="volume-info volume-info-text volume-info-description"> Abstract: The use of tertiary methyldiethanolamine (MDEA) as an absorbent for the CO<sub>2</sub> removal from process gas streams has increased due to its advantages over primary and secondary amines. Methanol is also widely used as an organic physical solvent for the CO<sub>2</sub> capture. Mixed solvents are expected to have a higher capacity for the acid gases than the solvent alone. The chemical absorption rate of CO<sub>2</sub> was measured in mixtures of MDEA (weight 5%, 15% and 30%) and water-methanol solutions at different % weight relations by using a stirred-cell reactor with plane gas-liquid interface. Experiments provided data measured at a range from 283.15 K to 313.15 K operation temperatures. Results show how the solubility of CO<sub>2 </sub>varies in all systems involved focusing on temperature and concentration changes. The solubility of CO<sub>2</sub> in the aqueous mixed MDEA with methanol as a solvent becomes significantly greater than in the aqueous amine alone. </div> <div> <a data-readmore="{ block: '#abstractTextBlock395629', lines: 2, expandText: '...more', collapseText: '...less' }"></a> </div> <div class="page-number semibold-large-text"> 193 </div> </div> <div class="item-block"> <div class="item-link"> <a href="/DDF.353.199">Evaluation of Rubidium and Potassium Diffusion in Soil by Radiotracer Technique</a> </div> <div class="item-link volume-authors"> <div class="semibold-middle-text"> Authors: E. Demir, A.B. Tugrul, Nilgun Baydogan, A.F. Baytaş, N. Altinsoy, S. Haciyakupoğlu, B. Büyük </div> </div> <div id="abstractTextBlock395630" class="volume-info volume-info-text volume-info-description"> Abstract: In this study, diffusion of rubidium and potassium in soil was observed representing two alkaline elements. Generally, these elements are found as salt compounds in the earth. Soil columns were prepared in the laboratory conditions. Rubidium chlorite and potassium nitrate compounds were irradiated at ITU TRIGA Mark II nuclear research reactor at the Energy Institute of ITU to produce the radiotracer <sup>86</sup>Rb and <sup>42</sup>K. The irradiated compounds were sprinkled to the surface of different soil columns and were watered with realistic amounts. Radioactivity measurements were carried out by using a scintillation detector at the outside of the column for different soil depths in different diffusion times. As the results of the study, the behavior of two alkaline elements was observed appropriately similar in the soil. </div> <div> <a data-readmore="{ block: '#abstractTextBlock395630', lines: 2, expandText: '...more', collapseText: '...less' }"></a> </div> <div class="page-number semibold-large-text"> 199 </div> </div> <div class="item-block"> <div class="item-link"> <a href="/DDF.353.205">Irradiation Effect on Ta<sub>2</sub>O<sub>5</sub> Thin Films</a> </div> <div class="item-link volume-authors"> <div class="semibold-middle-text"> Authors: Nilgun Baydogan, B. Erkan, A.B. Tugrul, H. Çimenoğlu </div> </div> <div id="abstractTextBlock395631" class="volume-info volume-info-text volume-info-description"> Abstract: Long-term effects of time-dependent solarization behavior on optical density and optical band gap of the gamma and beta irradiated Ta<sub>2</sub>O<sub>5</sub> thin films were investigated to examine the optical aging of films at different absorbed dose levels. Irradiation process caused to induce defect centres. The population inversion of the colour centres was increased by controlling the absorbed dose at certain radiation dose levels. The efficient absorption of photons in tantalum reduced transmittance. The grain boundaries of the Ta<sub>2</sub>O<sub>5</sub> thin film decreased at the end of irradiation process. The average grain boundaries changed after the irradiation process at 4.5 kGy and average grain boundaries decreased from ~ 11.5 to 5.5 μm. The optical fading behavior of induced color centers addressed to the potential opportunities of Ta<sub>2</sub>O<sub>5</sub> thin film by monitoring absorption of photons in optoelectronic technology. Optical fading of the Ta<sub>2</sub>O<sub>5</sub> thin film presented an importance to investigate the material stored ionizing radiation dose in it with the increase of elapsed time after the irradiation treatment. </div> <div> <a data-readmore="{ block: '#abstractTextBlock395631', lines: 2, expandText: '...more', collapseText: '...less' }"></a> </div> <div class="page-number semibold-large-text"> 205 </div> </div> <div class="item-block"> <div class="item-link"> <a href="/DDF.353.211">Effect of Voltage Parameters on Surface Morphology of Micro Arc Oxidized Cp Titanium</a> </div> <div class="item-link volume-authors"> <div class="semibold-middle-text"> Authors: Selim Kaan Yazici, Faiz Muhaffel, Murat Baydogan </div> </div> <div id="abstractTextBlock395632" class="volume-info volume-info-text volume-info-description"> Abstract: In this study, commercially pure titanium (Cp-Ti) was micro arc oxidized in an alkaline solution by using a bipolar power supply capable of applying square voltage pulses. In the oxidation process, voltage level and numbers of positive and negative pulses were varied, and the effect of such parameters on surface and cross sectional morphology of the coatings were evaluated. In characterization works, X-ray diffraction analysis (XRD), scanning electron microscopy (SEM), coating thickness measurements and surface roughness measurements were employed. Results generally showed that coating thickness and surface roughness greatly depend on the voltage level in that higher voltage levels give thicker coatings and rougher surfaces. When the number of successive positive voltage pulses is increased, more uniform surface appearance with well distributed and equal sized micro pores are obtained up to 400 V of positive voltage. When the oxidation is performed for positive and negative pulse numbers of 10-1 at higher voltage levels, the average pore size of the coating thickness increased and the number of pores decreased. </div> <div> <a data-readmore="{ block: '#abstractTextBlock395632', lines: 2, expandText: '...more', collapseText: '...less' }"></a> </div> <div class="page-number semibold-large-text"> 211 </div> </div> <div class="block-bottom-pagination"> <div class="pager-info"> <p>Showing 31 to 40 of 58 Paper Titles</p> </div> <div class="pagination-container"><ul class="pagination"><li class="PagedList-skipToFirst"><a href="/DDF.353"><<</a></li><li class="PagedList-skipToPrevious"><a href="/DDF.353/3" rel="prev"><</a></li><li class="PagedList-ellipses"><a class="PagedList-skipToPrevious" href="/DDF.353" rel="prev">…</a></li><li><a href="/DDF.353/2">2</a></li><li><a href="/DDF.353/3">3</a></li><li class="active"><span>4</span></li><li><a href="/DDF.353/5">5</a></li><li><a href="/DDF.353/6">6</a></li><li class="PagedList-skipToNext"><a href="/DDF.353/5" rel="next">></a></li></ul></div> </div> </div> </div> </div> </div> </div> </div> <div class="social-icon-popup"> <a href="https://www.facebook.com/Scientific.Net.Ltd/" target="_blank" rel="noopener" title="Scientific.Net"><i class="inline-icon facebook-popup-icon social-icon"></i></a> <a href="https://twitter.com/Scientific_Net/" target="_blank" rel="noopener" title="Scientific.Net"><i class="inline-icon twitter-popup-icon social-icon"></i></a> <a href="https://www.linkedin.com/company/scientificnet/" target="_blank" rel="noopener" title="Scientific.Net"><i class="inline-icon linkedin-popup-icon social-icon"></i></a> </div> </div> <div class="sc-footer"> <div class="footer-fluid"> <div class="container"> <div class="row"> <div class="footer-menu col-md-12 col-sm-12 col-xs-12"> <ul class="list-inline menu-font"> <li><a href="/ForLibraries">For Libraries</a></li> <li><a href="/ForPublication/Paper">For Publication</a></li> <li><a href="/insights" target="_blank">Insights</a></li> <li><a href="/DocuCenter">Downloads</a></li> <li><a href="/Home/AboutUs">About Us</a></li> <li><a href="/PolicyAndEthics/PublishingPolicies">Policy & Ethics</a></li> <li><a href="/Home/Contacts">Contact Us</a></li> <li><a href="/Home/Imprint">Imprint</a></li> <li><a href="/Home/PrivacyPolicy">Privacy Policy</a></li> <li><a href="/Home/Sitemap">Sitemap</a></li> <li><a href="/Conferences">All Conferences</a></li> <li><a href="/special-issues">All Special Issues</a></li> <li><a href="/news/all">All News</a></li> <li><a href="/read-and-publish-agreements">Read & Publish Agreements</a></li> </ul> </div> </div> </div> </div> <div class="line-footer"></div> <div class="footer-fluid"> <div class="container"> <div class="row"> <div class="col-xs-12"> <a href="https://www.facebook.com/Scientific.Net.Ltd/" target="_blank" rel="noopener" title="Scientific.Net"><i class="inline-icon facebook-footer-icon social-icon"></i></a> <a href="https://twitter.com/Scientific_Net/" target="_blank" rel="noopener" title="Scientific.Net"><i class="inline-icon twitter-footer-icon social-icon"></i></a> <a href="https://www.linkedin.com/company/scientificnet/" target="_blank" rel="noopener" title="Scientific.Net"><i class="inline-icon linkedin-footer-icon social-icon"></i></a> </div> </div> </div> </div> <div class="line-footer"></div> <div class="footer-fluid"> <div class="container"> <div class="row"> <div class="col-xs-12 footer-copyright"> <p> © 2024 Trans Tech Publications Ltd. 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Defect and Diffusion Forum Vol. 353 | p. 4 | Scientific.Net