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Dissertations / Theses on the topic 'Secondary precipitation'

Author: Grafiati

Published: 4 June 2021

Last updated: 8 June 2024

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1

Rey, Tomas. "Investigation of Microstructure and Mechanical Properties in Hot-work Tool Steels." Thesis, KTH, Materialvetenskap, 2017. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-210699.

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Hot-work tool steels make up an important group of steels that are able to perform with good strength and toughness properties at elevated temperatures and stresses. They are able to gain this behavior through their alloy composition and heat treatment, which relies on the precipitation of alloy carbides to counter the loss in strength as the tempered material becomes more ductile. As demand grows for materials that are suitable for even harsher applications and that show improved mechanical qualities, the steel industry must continuously investigate the development of new steel grades. Within

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2

Cardoso, Jorge Luiz. "Evaluation of the precipitation of secondary phases on CO2 environment corrosion resistance of austenitic and super austenitic stainless steels." reponame:Repositório Institucional da UFC, 2016. http://www.repositorio.ufc.br/handle/riufc/18440.

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CARDOSO, J. L. Evaluation of the precipitation of secondary phases on CO2 environment corrosion resistance of austenitic and super austenitic stainless steels. 2016. 133 f. Tese (Doutorado em Ciência de Materiais) – Centro de Tecnologia, Universidade Federal do Ceará, Fortaleza, 2016.<br>Submitted by Hohana Sanders (hohanasanders@hotmail.com) on 2016-07-15T13:48:21Z No. of bitstreams: 1 2016_tese_jlcardoso.pdf: 8753874 bytes, checksum: a423033a537ecd65f676406b27740c08 (MD5)<br>Approved for entry into archive by Marlene Sousa (mmarlene@ufc.br) on 2016-07-18T13:49:21Z (GMT) No. of bitstreams: 1

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3

Gudbrandsson, Snorri. "Experimental weathering rates of aluminium-silicates." Toulouse 3, 2013. http://thesesups.ups-tlse.fr/2225/.

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L'altération chimique des roches primaires et des minéraux dans les systèmes naturels a un impact majeur sur la formation des sols et leur composition. L'altération chimique est largement pilotée par la dissolution des minéraux. Les éléments chimiques libérés dans les eaux souterraines par la dissolution des minéraux réagissent facilement pour former des minéraux secondaires comme les argiles, zéolites et carbonates. Les carbonates se forment par réaction des cations divalents (Ca, Fe et Mg) avec CO2 dissous tandis que la formation des kaolins et de la gibbsite est attribuée à l'altération des

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4

Lloyd, Gary James. "Observations of the origin and distribution of primary and secondary ice in clouds." Thesis, University of Manchester, 2014. https://www.research.manchester.ac.uk/portal/en/theses/observations-of-the-origin-and-distribution-of-primary-and-secondary-ice-in-clouds(fbe41932-ddf0-49c2-b634-89575e919037).html.

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A detailed understanding of cloud microphysical processes is crucial for a large range of scientific disciplines that require knowledge of cloud particles for accurate climate and weather prediction. This thesis focuses on 3 measurement campaigns, encompassing both airborne and ground based measurements of the microphysical structures observed in cold, warm and occluded frontal systems around the United Kingdom, stratocumulus clouds in the Arctic and many different clouds observed over a 6 week period at a high-alpine site in the Swiss Alps. Particular attention was paid to the origin and dist

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5

Jubica, Jubica. "Characterization of Secondary Carbides in Low-Alloyed Martensitic Model Alloy Tool Steels." Thesis, KTH, Materialvetenskap, 2020. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-284449.

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The development of tool steels for making and shaping other materials requires a better understanding of the material's properties during manufacture. These high-quality steels include many alloying elements, which give increased hardness during tempering. For producing hardened microstructures, austenite generation is essential. The martensite formed by rapid quenching of austenite followed by tempering helps develop high strength steels. Studying carbide precipitation is a challenge as they are very small in size, present only in small volume fractions and high number densities. The carbide

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6

Buha, Joka School of Materials Science &amp engineering UNSW. "Interrupted ageing of Al-Mg-Si-Cu alloys." Awarded by:University of New South Wales. School of Materials Science and engineering, 2005. http://handle.unsw.edu.au/1959.4/20794.

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This thesis systematically investigates the effects of a recently developed modified ageing procedure of aluminium alloys, termed the T6I6 temper, on the microstructural development and mechanical properties of the Al ??? Mg ??? Si - Cu alloy 6061. For the T6I6 temper, a conventional single stage T6 temper is interrupted by an ageing period at a reduced temperature (65??C) to facilitate secondary precipitation, before resuming the final ageing at the temperature of the initial T6 treatment. The T6I6 temper was found to cause simultaneous increases in tensile properties, hardness, and toughness

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7

Maminska, Karolina. "Optimisation microstructurale d’un acier HP pour des applications à haute température." Thesis, Saint-Etienne, EMSE, 2013. http://www.theses.fr/2013EMSE0696/document.

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L’objectif de ce travail est d’améliorer la durée de vie en fluage d’un alliage résistant à haute température. L’alliage étudié, nommé « C », appartient à la classe des aciers austénitiques de type HP utilisés pour la fabrication des tubes de reformage. L’évolution microstructurale de l’alliage « C » a été étudiée dans une vaste gamme de températures, s’étendant de 700 à 1040°C pour des temps de vieillissement allant jusqu’à 1000 h. La caractérisation de ces états vieillis a été réalisée au moyen de la microscopie électronique (MEB-FEG, MET) et de la diffraction des rayons X. L’accent a été mi

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8

Jacumasso, Sheila Cristina. "CARACTERIZAÇÃO MICROESTRUTURAL DAS PARTÍCULAS DE SEGUNDA FASE DE UMA LIGA DE ALUMÍNIO AA7050 NAS CONDIÇÕES T7451, T6 E T6I4-65." UNIVERSIDADE ESTADUAL DE PONTA GROSSA, 2014. http://tede2.uepg.br/jspui/handle/prefix/1460.

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Made available in DSpace on 2017-07-21T20:43:44Z (GMT). No. of bitstreams: 1 Sheila Cristina Jacumasso.pdf: 3640428 bytes, checksum: 9f48682e159a5b7129a15abc7bb73945 (MD5) Previous issue date: 2014-06-02<br>Coordenação de Aperfeiçoamento de Pessoal de Nível Superior<br>The AA7050 class from the 7XXX series alloys based on Al-Zn-Mg-Cu are widely used in aerospace structures and fuselage components, when the same are subjected to high stress loading due to its high ratio mechanical strength to density, in addition, to its corrosion resistance. The increased resistance of these alloys is obtain

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9

Gudbrandsson, Snorri. "Vitesses d'altération expérimentales des silicates d'aluminium." Phd thesis, Université Paul Sabatier - Toulouse III, 2013. http://tel.archives-ouvertes.fr/tel-00933440.

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L'altération chimique des roches primaires et des minéraux dans les systèmes naturels a un impact majeur sur la formation des sols et leur composition. L'altération chimique est largement pilotée par la dissolution des minéraux. Les éléments chimiques libérés dans les eaux souterraines par la dissolution des minéraux réagissent facilement pour former des minéraux secondaires comme les argiles, zéolites et carbonates. Les carbonates se forment par réaction des cations divalents (Ca, Fe et Mg) avec CO2 dissous tandis que la formation des kaolins et de la gibbsite est attribuée à l'altération des

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10

Hendricks, Nicolette Rebecca. "The application of high capacity ion exchange adsorbent material, synthesized from fly ash and acid mine drainage, for the removal of heavy and trace metal from secondary Co-disposal process waters." Thesis, University of the Western Cape, 2005. http://hdl.handle.net/11394/1455.

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In South Africa, being the second largest global coal exporter, coal mining plays a pivotal role in the growth of our economy, as well as supplying our nation’s ever increasing electricity needs; while also accounting for more than 10% of the 20 x 109 m3 water used annually in the country. Coal mining may thus be classified as a large-scale water user; known to inevitably generate wastewater [acid mine drainage (AMD)] and other waste material, including fly ash (FA). Current and conventional AMD treatment technologies include precipitation–aggregation (coagulation/flocculation) – settling as h

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11

Gaudez, Steve. "Kinetics and microstructural evolutions during the tempering of martensitic and nano-bainitic low alloyed steel : in situ experimental study and modelling." Electronic Thesis or Diss., Université de Lorraine, 2021. http://www.theses.fr/2021LORR0016.

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Les aciers nano-bainitiques représentent une nouvelle classe d’alliages, avec une microstructure bainitique nano-structurée obtenue à basse température avec une fraction importante d’austénite résiduelle conduisant à une limite d’élasticité et à une ductilité élevées. Récemment, il a été observé que l’addition d’éléments carburigènes comme le V et le Mo dans ces microstructures augmente la résistance à l’adoucissement ainsi que les propriétés mécaniques à moyennes températures. Ainsi l’étude de la précipitation des carbures secondaires dans les microstructures nano-bainitiques est nécessaire p

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12

Papacosta, Ernestina Sismani. "Female delinquency in secondary schools : trauma and depression precipitating female delinquency and the role of ethnic identity in Cyprus." Thesis, Middlesex University, 2009. http://eprints.mdx.ac.uk/2679/.

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Adolescent school violence is a serious health problem that adversely affects the learning process. Prevention of juvenile delinquency and antisocial behavior has become a major field of research and policy making worldwide. The present study has been undertaken in an attempt to study the phenomenon of female juvenile delinquency in the schools in Cyprus since there is a lack of research on this challenging issue and its diverse parameters. The aim of this study has been to examine the extent of the phenomenon of female juvenile delinquency in secondary schools in Cyprus and the role of gender

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13

Popoola, Oludélé Olusègun. "Amorphisation et précipitation superficielles induites par implantation ionique dans les alliages NiTi équiatomiques : application aux propriétés tribologiques." Poitiers, 1988. http://www.theses.fr/1988POIT2292.

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Mise en evidence par microscopie electronique en transmission, spectrometrie sims et photoelectron d'une amorphisation superficielle et de la formation de fins precipites cristallins tin::(x) dans le cas d'une implantation, d'azote. Influence de la temperature et de la dose d'ion sur l'epaisseur de la couche. Correlation entre la microstructure d'implantation et les proprietes tribologiques. Le coefficient de frottement se trouve reduit et la resistance a l'usure se trouve amelioree de facon durable. L'initiation et la propagation des processus de degradation sont ainsi ralenties

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14

Popel, Aleksej. "The effect of radiation damage by fission fragments on the structural stability and dissolution of the UO2 fuel matrix." Thesis, University of Cambridge, 2017. https://www.repository.cam.ac.uk/handle/1810/265103.

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The aim of this work was to study the separate effect of fission fragment damage on the structural integrity and matrix dissolution of uranium dioxide in water. Radiation damage similar to fission damage was created by irradiating bulk undoped and doped ‘SIMFUEL’ disks of UO2, undoped bulk CeO2 and thin films of UO2 and CeO2 with high energy Xe and U ions. The UO2 thin films, with thicknesses in the range of 90 – 150 nm, were deposited onto (001), (110) and (111) orientations of single crystal LSAT (Al10La3O51Sr14Ta7) and YSZ (Yttria-Stabilised Zirconia) substrates. The CeO2 thin films were de

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15

蕭如君. "Analysis of secondary generation antipsychotics in human plasma by LC-ESI-MS with protein precipitating pretreatment." Thesis, 2011. http://ndltd.ncl.edu.tw/handle/24412991852214706618.

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碩士<br>國立交通大學<br>理學院應用科技學程<br>100<br>Olanzapine, quetiapine and aripiprazole were new generation atypical antipsychotics. Several methods have been developed to determinate these drugs in human blood, plasma, or serum with different analyzing methods. For LC/MS, liquid-liquid extraction or solid-phase extraction pretreatments were usually used before analysis. These pretreatment methods were complex, expensive, and time consuming. In this study, a rapid and effective protein precipitating procedure was used for extraction of antipsychotics in human plasma for LC/MS analysis. First, the paramete

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