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Dissertations / Theses on the topic 'Heat Effected Zones'

Author: Grafiati
Published: 3 June 2025
Last updated: 31 July 2025

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1

Juhas, Mary Catherine. "The effect of low temperature isothermal heat treatments on the intergranular corrosion of AISI 316 stainless steel simulated weld heat affected zones /." The Ohio State University, 1989. http://rave.ohiolink.edu/etdc/view?acc_num=osu1487673114115915.

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2

Bhattacharya, Neelabhro Madhav. "The effect of niobium in the heat-affected zone of microalloyed steel." Thesis, University of Cambridge, 2017. https://www.repository.cam.ac.uk/handle/1810/270305.

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The controlled, _ne-grained microstructure of thermomechanically processed Nb microalloyed linepipe steels is destroyed in the vicinity of welds used in fabricating pipelines. There are conflicting views on the influence of niobium in the `heat-affected zone', particularly in the region closest to the weld fusion line which is most dramatically impacted by the thermal cycling that occurs during welding. Consequently, there is a need to fully characterise the influence of niobium on the evolution of structures and properties in this zone. The aim of the work presented in this thesis was to quan
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3

Salama, Adel. "Laser machining of carbon fibre reinforced polymer composite." Thesis, University of Manchester, 2016. https://www.research.manchester.ac.uk/portal/en/theses/laser-machining-of-carbon-fibre-reinforced-polymer-composite(7310ed95-b876-480b-a8b4-2033b4309cb6).html.

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Carbon fibre reinforced polymer (CFRP) composites have found a wide range of applications in the aerospace, marine, sports and automotive industries owing to their lightweight and acceptable mechanical properties compared to the commonly used metallic materials. The currently dominating method of machining CFRP is by mechanical means that has found many problems including extensive tool wear, fibre pull-out and delamination. Lasers as non-contact tools have been widely applied for cutting and drilling materials. However, machining of CFRP composites using lasers can be challenging due to inhom
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4

Nuruddin, Ibrahim K. "Effect of welding thermal cycles on the heat affected zone microstructure and toughness of multi-pass welded pipeline steels." Thesis, Cranfield University, 2012. http://dspace.lib.cranfield.ac.uk/handle/1826/7755.

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This research is aimed at understanding the effect of thermal cycles on the metallurgical and microstructural characteristics of the heat affected zone of a multi-pass pipeline weld. Continuous Cooling Transformation (CCT) diagrams of the pipeline steel grades studied (X65, X70 and X100) were generated using a thermo mechanical simulator (Gleeble 3500) and 10 mm diameter by 100 mm length samples. The volume change during phase transformation was studied by a dilatometer, this is to understand the thermodynamics and kinetics of phase formation when subjected to such varying cooling rates. Sampl
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5

Bevin, Emma, and Matilda Björklund. "Sample quality effects of laser cutting : An empirical study on the heat affected zone and the surface quality in laser cut samples." Thesis, KTH, Materialvetenskap, 2020. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-277878.

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This study has been conducted with the aim to examine the extent of the heat affected zone in order to use laser cutting when making samples for tensile testing. When cutting with a laser the material absorbs heat energy from the laser beams which causes changes in the microstructure. The heat affected zone affects the properties of the materials, lowering the accuracy of the tensile test. Therefore, it is desired to know the extent of the heat affected zone in order to remove it before tensile testing. In this study two materials were used, the high strength steel Docol 1000DP and the duplex
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6

Lavvafi, Hossein. "EFFECTS OF LASER MACHINING ON STRUCTURE AND FATIGUE OF 316LVM BIOMEDICAL WIRES." Case Western Reserve University School of Graduate Studies / OhioLINK, 2013. http://rave.ohiolink.edu/etdc/view?acc_num=case1352743353.

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7

Gjønnes, Anders Welde. "Effect of Sulfide Inclusions in Austenitic Stainless Steel on the Initiation of Pitting in Base Metal and Heat Affected Zone after Welding." Thesis, Norges teknisk-naturvitenskapelige universitet, Institutt for materialteknologi, 2012. http://urn.kb.se/resolve?urn=urn:nbn:no:ntnu:diva-19594.

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The predominant site for the initiation of pitting on austenitic stainless steel has been shown to be sulfide inclusions and notably the manganese types of sulfides. Dissolution of inclusions has been observed and suggested to be the initial step for pit initiation, though several explanations for the mechanisms causing initiation has been proposed. Regarding welded stainless steels, several microstructural changes have been described and suggested to contribute to the decreased corrosion resistance in the weld zone. An area which has not been investigated much is the contribution of inclusion
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8

Groters, Douglas J. "The temporal and spatial variability of the marine atmospheric boundary layer and its effect on electromagnetic propagation in and around the Greenland Sea marginal ice zone." Thesis, Monterey, California. Naval Postgraduate School, 1988. http://hdl.handle.net/10945/23422.

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Approved for public release; distribution is unlimited<br>Variability of the MABL and its effect on the electromagnetic (EM) refractive structure around the Greenland Sea marginal ice zone were examined. Rawinsonde profiles and surface observations collected from 3 ships during MIZEX-87(20 March-11 April) served as the data set. A program, developed to calculate the refractivity at each vertical level of the rawinsonde profiles, also identified the levels at which trapping, superrefraction and subrefraction occurred. Temporal studies showed that a higher incidence of anomalous refractive layer
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9

Mert, Emel. "Effect of air gap thickness and contact area on heat transfer through garments in real life situation." Thesis, Mulhouse, 2016. http://www.theses.fr/2016MULH9978.

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Le corps humain et les vêtements sont toujours en interaction directe avec l’environnement, le corps devant maintenir sa température à environ 37°C. Les transferts de chaleur sont affectés non seulement par les propriétés de l’étoffe constitutives du vêtement, mais également par l’épaisseur de la couche d’air entre le corps et le vêtement. Les propriétés thermiques de la couche d’air dépendent de son étendue, influencée par les courbures du corps humain, des propriétés mécaniques de l’étoffe et de la forme du vêtement. Il est donc nécessaire de déterminer la forme 3D du corps et la répartition
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10

Lightle, Nicole E. "Effects of Air vs. Air+Soil Heating During a Simulated Heat Wave on White Oak (Quercus alba) and Black Oak (Quercus velutina)." University of Toledo / OhioLINK, 2013. http://rave.ohiolink.edu/etdc/view?acc_num=toledo1365159241.

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11

Lynn, David Benjamin. "The flammability of metallic materials in normal and reduced gravity." Thesis, Queensland University of Technology, 2011. https://eprints.qut.edu.au/46700/1/David_Lynn_Thesis.pdf.

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Metallic materials exposed to oxygen-enriched atmospheres – as commonly used in the medical, aerospace, aviation and numerous chemical processing industries – represent a significant fire hazard which must be addressed during design, maintenance and operation. Hence, accurate knowledge of metallic materials flammability is required. Reduced gravity (i.e. space-based) operations present additional unique concerns, where the absence of gravity must also be taken into account. The flammability of metallic materials has historically been quantified using three standardised test methods developed b
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12

Kolb, Peter Markus. "The Effects of Temperature on Judgment and Behavior in the Contexts of Jurisdiction, Retail, and Services." Doctoral thesis, Universitätsbibliothek Chemnitz, 2012. http://nbn-resolving.de/urn:nbn:de:bsz:ch1-qucosa-96306.

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Warum verwenden wir Wörter, die mit physikalischer Temperatur zu tun haben, zur Beschreibung zwischenmenschlicher Phänomene (wie zum Beispiel “eine warmherzige Person” oder “jemandem die kalte Schulter zeigen”)? Jüngere Forschung im Bereich Embodied Cognition hat in aktuellen Publikationen eine Antwort auf diese Frage geliefert: Das Erleben von physikalischer Wärme wird unbewusst mit Gefühlen interpersonaler Wärme assoziiert; physikalische Kälte hingegen wird mit Gefühlen von interpersonaler Kälte und Einsamkeit verbunden. In diesem Zusammenhang konnten beispielsweise Williams und Bargh (2008
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13

Herng, Liou Shyue, and 劉學衡. "Microstructure Evolution and Phase Transformation Research on the Heat Effected Zone of A533 Alloy Steel." Thesis, 1993. http://ndltd.ncl.edu.tw/handle/28923749107180086425.

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碩士<br>國立臺灣大學<br>材料科學(工程)研究所<br>81<br>A533合金鋼為一種重要的核能壓力容器材料，在經過淬火及回火處理後， 做為壓力容器主體。當其做為壓力容器的主體時，在銲接接合時會產生所 謂的熱影響區，而造成強度和韌性的降低，為了提昇A533材料使用上的安 全性，便須對銲接所造成的熱影響區多加注意，因此，本研究將針對銲接 熱影響區顯微組織之相變態特性及其與衝擊韌性之關係做一研究。實驗步 驟為先將A533 type B 材料經淬火及回火處理後成為class 1的材料做為 銲接的母材，再對母材施以三種不同入熱量20KJ/cm、50KJ/cm、80KJ/cm 的銲接熱模擬，觀察其顯微結構與衝擊韌性的關係。接著將經不同入熱 量 20KJ/cm、50KJ/cm、80KJ/cm的銲接熱模擬所得試片中，分別施以620 ℃保持1/2小時、1小時、2 小時、4 小時、6小時的銲後熱處理，來觀察 在不同入熱量熱模擬後，經過不同時間的熱處理時其顯微結構之間的改變
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14

Gravador, Rufielyn Sungcaya. "Determination of temperature effecton the measurements of pKa of some weak acids and weak bases using capillary zone electrophoresis." Master's thesis, 2010. http://hdl.handle.net/10400.1/10748.

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This study was done to determine the pKa values of a number of weak acidic and basic compounds at different temperatures and to be able to identify the effects of temperature variations in the measured pKa using capillary zone electrophoresis. The method employed was adopted from Fuguet et al [12] in which internal standard is used. Running buffers of different pH were prepared. The maximum voltage was chosen based from Ohm’s law to reduce the Joule heating effects. Considering the linearity in the relationship between voltage and current to be with an r2≥0.999, the maximum voltage was found t
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15

Peng, Yu-Shan, and 彭于珊. "The Effect of Heat Flow on the Base of Gas Hydrate Stability Zone in the Yung-An Ridge Area Offshore Southwestern Taiwan." Thesis, 2012. http://ndltd.ncl.edu.tw/handle/03770504719374057245.

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碩士<br>國立臺灣大學<br>海洋研究所<br>100<br>Geophysical, geological and geochemical investigation results indicate that gas hydrates are widely distributed in the area offshore southwestern Taiwan. The formation of gas hydrate is controlled by temperature and pressure conditions. In the offshore environment, pressure normally follow water depths, thus gas hydrate stability is more susceptible to changes in temperature then in pressure. In this study, we analyze the variation of heat flow values in the Yung-An Ridge area, and compare them with the seismic profile to discuss the possible reasons. We divide
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16

Liu, P. C., and 劉炳志. "Effect of heat-affected zone on the Corrosion Behavior of A516 Steel and 304 Stainless Steel in a Simulated Water Vapor Containing NaCl." Thesis, 2000. http://ndltd.ncl.edu.tw/handle/24706892744738363082.

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碩士<br>國立海洋大學<br>材料工程研究所<br>88<br>ABSTRACT The effect of the heat-affected zone (HAZ) on corrosion behavior of pressurized-vessel steel (A516) and 304 stainless steel (304ss) was studied over the temperature range 200 - 400oC in a simulated water vapor containing NaCl and at 200 oC in the real atmospheric environment. The effect of NaCl surface-coating (2 mg/cm2) on corrosion kinetics of the heat-affected zone of both steels was also evaluated in the same environment, and the results compared to those of steels without surface-coating. In general, the results showed that t
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17

Wu, Ruei-Hung, and 吳睿紘. "Effect of Interstitial Elements on the Microstructure, Mechanical Properties and Corrosion Resistance of the Heat Affected Zone in a 16％Cr Ferritic Stainless Steel Weld." Thesis, 2011. http://ndltd.ncl.edu.tw/handle/03820029889275336432.

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碩士<br>義守大學<br>材料科學與工程學系碩士班<br>99<br>In this study, different interstitial element contents, (C + N), of 16% Cr ferritic stainless steel plates were welded by using Gas metal arc welding,( GMAW or MIG) process under various welding parameters. After welding, the welded samples were investigated by employing optical microscope (OM) , scanning electron microscope(SEM), X-ray Diffraction(XRD), tensile strength, and corrosion immersion test to study the effects of (C + N) contents and welding parameters on the microstructure, mechanical properties and corrosion resistance of the welded 16% Cr fer
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18

Pepin, Joel. "Effects of Submerged Arc Weld (SAW) Parameters on Bead Geometry and Notch-Toughness for X70 and X80 Linepipe Steels." Master's thesis, 2009. http://hdl.handle.net/10048/665.

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For the manufacture of higher strength pipelines to be feasible, a better understanding of the effects of welding on toughness is necessary. Bevel submerged arc welds were performed on X80 grade steel. The subsequent Charpy V-notch (CVN) test results indicated that the notch placement in the various heat affected zone regions, and hence the bead geometry, affected the test results. A series of bead-on-plate (BOP) submerged arc welds then were performed on X70 grade steel plate to determine the effects of current, voltage, heat input, polarity, and waveform manipulation (i.e., balance, offset,
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