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Dissertations / Theses on the topic 'Microstructure; Hardness'

Author: Grafiati

Published: 5 June 2025

Last updated: 15 July 2025

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1

Ohlsson, Richard. "Variations in hardness and microstructure in cartridge cases at annealing." Thesis, Karlstads universitet, Fakulteten för hälsa, natur- och teknikvetenskap (from 2013), 2018. http://urn.kb.se/resolve?urn=urn:nbn:se:kau:diva-68670.

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The thesis work is performed at Norma Precision AB, a company that manufactures ammunition for hunting and competitive shooting. Two types of cases called 300 Winchester Magnum and 308 Winchester are examined on how their hardness were prior to and after the two annealing’s of the neck they experience during the manufacturing. The cases vary in hardness and an investigation will be made to draw connections to the microstructure of the cases in order to understand the variations and possibly avoid the variations in the future. The cases were selected at different days, the 300 Winchester Magnum

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2

Davock, Helen Jane. "Analysis of multilayer coatings by electron microscopy." Thesis, University of Liverpool, 1998. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.366423.

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3

Lin, Ching-Te 1967. "Microstructure, texture, and hardness gradients in aluminum diffusion-bonded to aluminum oxide." Thesis, Massachusetts Institute of Technology, 1998. http://hdl.handle.net/1721.1/50351.

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4

Hapazari, Innocent. "Effects of thermomechanical processing on microstructure and hardness profiles in AA6061 plates." Master's thesis, University of Cape Town, 2003. http://hdl.handle.net/11427/10615.

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Includes bibliographical references.<br>Effects of rolling variables - strain (?), strain rate (?) and temperature (T) - on grain structure and hardness evolution in AA6061 plates were investigated by simulating the rolling process using plane strain compression (PSG). Particular emphasis was exerted on understanding the impact of the variables on the overall mean grain size and hardness, as well as how they influence the grain size and hardness profiles through the thickness of the rolled plates. Prior to PSG investigations, the grain size and hardness profiles of the supplied material (trans

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5

Li, Yu. "Effect of aluminium and vanadium on the microstructure and properties of microalloyed steels." Thesis, University of Strathclyde, 1999. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.366804.

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6

Darras, Basil M. "EXPERIMENTAL AND ANALYTICAL STUDY OF FRICTION STIR PROCESSING." UKnowledge, 2005. http://uknowledge.uky.edu/gradschool_theses/353.

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Friction stir processing (FSP) has recently become an effective microstructural modifications technique. Reported results showed that for different alloys, FSP produces very fine equiaxed and homogeneous grain structure. FSP is considered to be a new processing technique and more experimental and analytical investigations are needed to advance the industrial utilization of FSP. Most of the work that has been done in the friction stir processing field is experimental and limited modeling activities have been conducted. Attempts to develop a predictive model to correlate the resulting microstruc

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7

Mageto, Maxwell Joel. "Tem study of microstructure in relation to hardness and ductility in Al-Mg-Si (6xxx) alloys." Thesis, Norwegian University of Science and Technology, Department of Physics, 2003. http://urn.kb.se/resolve?urn=urn:nbn:no:ntnu:diva-658.

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<p>Two different solution heat treatments (2hours at 570ºC and 10minutes at 520ºC) have been used to study precipitation in two 6xxx (Al-Mg-si) dispersoid-freealloys with composition: 0.721 at % Si, 0.577 at % Mg (alloy A3) and 0.57 at %Si 0.72 at % Mg (alloy A12). The relation between their microstructure and macroscopical properties such as hardness and ductility has been investigated. Tensile tests, hardness measurements, electrical conductivity sigma tests, grain size measurements in optical microscope and microstructure characterization in Transmission Electron Microscope (TEM) have all b

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8

Kannan, Manigandan. "The Microstructure, Hardness, Impact Toughness, Tensile Deformation and Final Fracture Behavior of Four Specialty High Strength Steels." University of Akron / OhioLINK, 2011. http://rave.ohiolink.edu/etdc/view?acc_num=akron1311884520.

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9

Vaughan, R. A. "The effects of hardness, toughness, microstructure and thermomechanical heating on the erosion of ceramic and ultrahard materials." Master's thesis, University of Cape Town, 1991. http://hdl.handle.net/11427/18218.

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Nine different ceramic and ultrahard materials have been eroded by four different erodents under standardised experimental conditions. The target materials range from the soft stabilised zirconias to the very hard polycrystalline diamond composites. The four erodent particles used were: soft, friable silica, sharp alumina, tough silicon carbide and very hard, synthetic industrial diamonds. The steady state erosion rates of the different target/erodent combinations were measured. The erosion for each combination was studied by examining the target surfaces at progressive stages of erosion and t

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10

Barlow, Lilian D. "The effect of austenitising and tempering parameters on the microstructure and hardness of martensitic stainless steel AISI 420." Pretoria : [s.n.], 2009. http://upetd.up.ac.za/thesis/available/etd-11262009-182934/.

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11

Godbole, Chinmay. "The Influence of Reinforcement on Microstructure, Hardness, Tensile Deformation, Cyclic Fatigue and Final Fracture behavior of two Magnesium Alloys." University of Akron / OhioLINK, 2011. http://rave.ohiolink.edu/etdc/view?acc_num=akron1321633235.

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12

SOARES, JUNIOR EDMO. "Efeito do tratamento térmico na microestrutura e nas propriedades mecânicas de aços-ferramenta para trabalho a frio." reponame:Repositório Institucional do IPEN, 2006. http://repositorio.ipen.br:8080/xmlui/handle/123456789/11464.

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13

LOBO, RAQUEL de M. "Analise microestrutural do zircaloy-4 submetido a diferentes tratamentos termo - mecanicos." reponame:Repositório Institucional do IPEN, 2002. http://repositorio.ipen.br:8080/xmlui/handle/123456789/11031.

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14

Bueno, Juliano de Sousa. "Avaliação das propriedades mecânicas do aço DIN 27MnCrB5 para o processo de estampagem a quente." reponame:Biblioteca Digital de Teses e Dissertações da UFRGS, 2017. http://hdl.handle.net/10183/163760.

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Este trabalho avalia as propriedades mecânicas, microestrutura resultante e força de estampagem da liga DIN 27MnCrB5 para o processo de estampagem a quente nas temperaturas de aquecimento de 750°C, 850°C e 950°C. Para isso foram realizados ensaios nas três temperaturas e medidos os valores da força necessária para a estampagem da chapa, que foi aplicada em uma área de 30mm x 1,50mm. A partir da peça estampada foram realizadas análises metalográficas da microestrutura resultante e medições de dureza para a correlação com as propriedades mecânicas. Para as temperaturas de aquecimento de 750°C e

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15

Nurbanasari, M. "Influence of conventional heat treatment and thermomechanical processing on the microstructure and hardness of two tungsten hot working tool steels." Thesis, University of Sheffield, 2013. http://etheses.whiterose.ac.uk/4105/.

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The H21 and H23 tungsten hot working tool steels are used at elevated working temperatures due to their resistance to softening, high hot hardness, and high compressive strength. The mechanical properties of these tool steels are strongly affected by the presence of carbides. High concentration of carbide forming elements in these tool steels tends to form brittle eutectic carbide networks. Carbide networks in the as cast condition are detrimental to their mechanical properties. The objective of this study was to identify controlled thermomechanical processing (TMP) parameter, namely deformati

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16

Sojiphan, Kittichai. "Effects of Very High Power Ultrasonic Additive Manufacturing Process Parameters on Hardness, Microstructure, and Texture of Aluminum 3003-H18 Alloy." The Ohio State University, 2015. http://rave.ohiolink.edu/etdc/view?acc_num=osu1418667794.

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17

Saraloglu, Ebru. "Effect Of Ecap And Subsequent Heat Treatments On Microstructure And Mechanical Properties Of 2024 Aluminum Alloy." Master's thesis, METU, 2008. http://etd.lib.metu.edu.tr/upload/3/12609811/index.pdf.

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Severe plastic deformation (SPD) results in ultra-fine grain sizes in metals and alloys. Equal channel angular pressing (ECAP) is one of the special SPD methods aiming to introduce high plastic strains into the bulk materials without changing their cross section. ECAP results in improvement in hardness and strength while still satisfying acceptable ductility level. The combined effects of ECAP and subsequent heat treatments, i.e. post-aging and post-annealing, on the microstructure and hardness of the 2024 aluminum alloy were investigated. An ECAP die with 120&amp<br>#730<br>channel angle was

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18

GODOY, ANA L. E. "Estudo da influência da adição de polímeros precursores cerâmicos na sinterização de SiC e Alsub(2)Osub(3)." reponame:Repositório Institucional do IPEN, 2005. http://repositorio.ipen.br:8080/xmlui/handle/123456789/9288.

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19

Gireesh, Guruprasad. "INFLUENCE OF PROCESSING VARIABLES ON MICROSTRUCTURE DEVELOPMENT AND HARDNESS OF BULK SAMPLES OF TWO NOVEL CERAMICS PREPARED BY PLASMA PRESSURE COMPACTION." University of Akron / OhioLINK, 2006. http://rave.ohiolink.edu/etdc/view?acc_num=akron1144246756.

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20

Dabou, Oussama. "Etude de la microstructure, de la texture et des propriétés magnétiques d'un alliage à base de Ni et de Fe après traitement par déformation plastique sévère et recuit." Electronic Thesis or Diss., université Paris-Saclay, 2024. http://www.theses.fr/2024UPASF020.

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Cette thèse propose une étude exhaustive de l'alliage Mumetal, en se penchant sur sa microstructure, sa texture, sa dureté, ses propriétés magnétiques et leurs interrelations. Deux aspects majeurs sont examinés. La première partie se penche sur les changements microstructuraux et mécaniques induits par des techniques de déformation plastique sévère (SPD) telles que le multi coulaminage (ARB), la torsion sous haute pression (HPT) et le pressage ondulé sous contrainte (CGP). Après ARB, la microstructure du Mumetal évolue de grains équiaxes à des grains allongés. Des gradients de dislocation, des

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21

Vargas-Gonzalez, Lionel Ruben. "Microstructural optimization of solid-state sintered silicon carbide." Diss., Georgia Institute of Technology, 2009. http://hdl.handle.net/1853/34691.

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In this work, the development of theoretically-dense, clean grain boundary, high hardness solid-state sintered silicon carbide (SiC) armor was pursued. Boron carbide and graphite (added as phenolic resin to ensure the carbon is finely dispersed throughout the microstructure) were used as sintering aids. SiC batches between 0.25-4.00 wt.% carbon were mixed and spray dried. Cylindrical pellets were pressed at 13.7 MPa, cold-isostatically pressed (CIP) at 344 MPa, sintered under varying sintering soaking temperatures and heating rates, and varying post hot-isostatic pressing (HIP) parameters.

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22

Caris, Joshua. "Heat Treatment Effects on Mechanical Behavior of Cu-15Ni-8Sn Produced via Powder Metallurgy." Case Western Reserve University School of Graduate Studies / OhioLINK, 2007. http://rave.ohiolink.edu/etdc/view?acc_num=case1184360740.

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23

El, Sebaie Ossama. "L'effet de l'addition du "mischmetal", du taux de refroidissement et du traitement thermique sur la microstructure et la dureté des alliages Al-Si de type 319, 356, et 413 = Effect of mischmetal, cooling rate and heat treatment on the microstructure and hardness of 319, 3456, and 413 Al-Si alloys /." Thèse, Chicoutimi : Université du Québec à Chicoutimi, 2006. http://theses.uqac.ca.

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24

JESUS, SERGIO L. de. "Desenvolvimento e caracterizacao da liga Cu-Ni-Be para fins eletro-eletronicos." reponame:Repositório Institucional do IPEN, 2000. http://repositorio.ipen.br:8080/xmlui/handle/123456789/10828.

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25

Bazalová, Lucie. "Povrchové kalení ocelí výkonovým polovodičovým laserem." Master's thesis, Vysoké učení technické v Brně. Fakulta strojního inženýrství, 2014. http://www.nusl.cz/ntk/nusl-231517.

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The master thesis deals with the technology of surface hardening of steels by high power diode laser. The thesis is an experiment of surface hardening of steel 12 050 on various parameters of speed movement of the laser head and used power. At first, the work deals with the possible technology of surface hardening, industrial lasers and possible methods for measuring hardness. It describes the material used and the evaluation of the macrostructure and microstructure of the samples and evaluates the achievement of hardness, depending on the distance from the surface. The results are used to ass

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26

Bredda, Eduardo Henrique. "Caracterização microestrutural do aço ODS Eurofer recozido isotermicamente até 1350oC." Universidade de São Paulo, 2015. http://www.teses.usp.br/teses/disponiveis/97/97134/tde-14092016-180913/.

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O aço ferrítico-martensítico ODS Eurofer com 9%pCr (ODS - do inglês oxide dispersion strengthened), objeto de estudo dessa dissertação, é um potencial candidato para fins estruturais em reatores de fusão nuclear. Este material foi produzido via metalurgia do pó e consolidado por prensagem isostática. Em seguida sofreu laminação cruzada a quente e revenimento em 750°C por 2h. Esta foi a condição como recebida desse aço, o qual foi cedido pelo KIT (Karlsruher Institut für Technologie - Alemanha). Este aço possui 0,3%p de partículas de ítria (Y2O3) com diâmetro entre 10 e 30 nm. Uma das finalidad

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27

Hu, Zhihao. "Studies on Sintering Silicon Carbide-Nanostructured Ferritic Alloy Composites for Nuclear Applications." Thesis, Virginia Tech, 2016. http://hdl.handle.net/10919/81763.

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Nanostructured ferritic alloy and silicon carbide composite materials (NFA-SiC) were sintered with spark plasma sintering (SPS) method and systematically investigated through X-ray diffraction (XRD), scanning electron microscopy (SEM), as well as density and Vickers hardness tests. Pure NFA, pure SiC, and their composites NFA-SiC with different compositions (2.5 vol% NFA-97.5 vol% SiC, 5 vol% NFA-95 vol% SiC, 97.5 vol% NFA-2.5 vol% SiC, and 95 vol% NFA-5 vol% SiC) were successfully sintered through SPS. In the high-NFA samples, pure NFA and NFA-SiC, minor gamma-Fe phase formation from the mai

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28

Chichti, Emna. "Multi-scale approach for understanding the link between Triticum aestivum grain texture and milling behaviour : focus on the endosperm microstructure and local nano-mechanical properties." Thesis, Montpellier, SupAgro, 2013. http://www.theses.fr/2013NSAM0019/document.

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La texture de l'albumen de blé tendre (Triticum aestivum) est une propriété importante du grain qui affecte son comportement au fractionnement, ainsi que la qualité des produits finis. Elle est définie par la dureté et la vitrosité qui sont deux propriétés différentes du blé. La dureté est reliée à l'adhésion entre les granules d'amidon et la matrice protéique (principaux constituants de l'albumen) qui est contrôlée génétiquement à travers l'état des puroindolines (sauvages ou mutées). La vitrosité est associée à la porosité de l'albumen et varie principalement en fonction des conditions de cu

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29

Exime, Ana S. "Effect of Ultrasonic Treatment on the microstructure and mechanical properties of Al6061 and composite." FIU Digital Commons, 2017. https://digitalcommons.fiu.edu/etd/3534.

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In this study, the effect of ultrasonic treatment (UST) parameters such as amplitude, sonication time, and melt temperature on microstructure and microhardness of Al 6061 alloy is evaluated. The effect of UST on the dispersion of tungsten disulfide (WS2) and carbon nanotubes (CNT) as reinforcement particles in Al 6061 during casting is also studied. The cast Al 6061 with UST demonstrated 32% grain size reduction and 8% increase in the microhardness for optimum processing conditions. The cavitation process induced by UST is responsible for the refinement in microstructure and increase of hardne

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30

SANTOS, THAIS da S. "Micro-nanocompósitos de Al2O3/ NbC/ WC e Al2O3/ NbC/ TaC." reponame:Repositório Institucional do IPEN, 2014. http://repositorio.ipen.br:8080/xmlui/handle/123456789/23599.

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Submitted by Claudinei Pracidelli (cpracide@ipen.br) on 2015-03-17T11:04:02Z No. of bitstreams: 0<br>Made available in DSpace on 2015-03-17T11:04:02Z (GMT). No. of bitstreams: 0<br>Dissertação (Mestrado em Tecnologia Nuclear)<br>IPEN/D<br>Instituto de Pesquisas Energeticas e Nucleares - IPEN-CNEN/SP

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Bass, Roger Wesley. "Synthesis and Characterization of Self-Healing Poly (Carbonate Urethane) Carbon-Nanotube Composites." Scholar Commons, 2011. http://scholarcommons.usf.edu/etd/2999.

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Synthesis of high molar mass polycarbonate polyurethanes using a novel polyol is described. The resulting elastomers demonstrate excellent mechanical properties as well as the capability to re-heal after rupture without the addition of additives or imbedded healing agents. The self-healing functionality is shown to greatly improve with the addition of up to 1% single and multi-walled carbon nanotubes. The interface of the carbon nanotubes and self-healing polymer are probed using Raman techniques and provide an insight into how the self-healing actions are improved with the addition of carb

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32

Smith, Mackenzie Boeing J. "The Correlation of Hardness to Toughness and the Superior Impact Properties of Martensite in Pressure Vessel Steels applied to Temper Bead Qualification." The Ohio State University, 2021. http://rave.ohiolink.edu/etdc/view?acc_num=osu1609939800037596.

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33

Ribes, Hervé. "Microstructure de composites aluminium-carbure de silicium après traitements thermomécaniques." Grenoble INPG, 1989. http://www.theses.fr/1989INPG0084.

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Ce travail porte sur l'etude de composites a matrices aluminium (al-mg-si) renforcees par des particules de carbure de silicium qui ont ete utilisees soit brut de reception soit prealablement oxydees. Une investigation microstructurale detaillee (realisee en partie par microscopie electronique en transmission) a permis de preciser la nature de l'interface al/sic dans ces composites ainsi que l'evolution de la precipitation apres traitements thermiques. Nous avons montre que l'interface est souvent composee par differentes interphases dont la composition et le mode de formation sont presentes.

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NEVES, MAURICIO D. M. das. "Sinterização de misturas de pós de ligas de ferro para aplicações automotivas." reponame:Repositório Institucional do IPEN, 2005. http://repositorio.ipen.br:8080/xmlui/handle/123456789/11376.

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Huang, Bo. "Cryogenic Processing of Al 7050-T7451 Alloy for Improved Surface Integrity." UKnowledge, 2016. http://uknowledge.uky.edu/me_etds/78.

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Al 7050-T7451 alloy with good combinations of strength, stress corrosion cracking resistance and toughness, is used broadly in the aerospace/aviation industry for fatigue-critical airframe structural components. However, it is also considered as a highly anisotropic alloy as the crack growth behavior along the short transverse direction is very different from the one in the long transverse direction, due to the inhomogeneous microstructure with the elongated grains distributed in the work material used in the sheet/plate applications. Further processes on these materials are needed to improve

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36

Liu, Jie. "Characterization of New Rotary Endodontic Instruments Fabricated from Special Thermomechanically Processed NiTi Wire." The Ohio State University, 2009. http://rave.ohiolink.edu/etdc/view?acc_num=osu1244643081.

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Godoy, Ana Lúcia Exner. "Estudo da influência da adição de polímeros precursores cerâmicos na sinterização de SiC e Al2O3." Universidade de São Paulo, 2006. http://www.teses.usp.br/teses/disponiveis/85/85134/tde-18052012-141434/.

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Neste trabalho foram avaliados os efeitos da adição de polímeros precursores na sinterização, microestrutura, dureza e na tenacidade à natura de materiais cerâmicos à base de carbeto de silício e de AI2O3. As matérias-primas cerâmicas foram caracterizadas por análise semi-quantitativa por espectrometria de fluorescência de raios X, difração por laser, adsorção gasosa e microscopia eletrônica de varredura. Para os polímeros utilizou-se análise termogravimétrica. A cinética de sinterização das amostras compactadas foi estudada por dilatometria. A caracterização dos materiais sinterizados incluiu

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38

Demetriou, Velissarios. "The effect of microstructure on the performance of nickel based alloys for use in oil and gas applications." Thesis, University of Manchester, 2017. https://www.research.manchester.ac.uk/portal/en/theses/the-effect-of-microstructure-on-the-performance-of-nickel-based-alloys-for-use-in-oil-and-gas-applications(4f941712-6e87-423e-8f6d-4b9b3eaabbf7).html.

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This research focused on a comprehensive microstructural and mechanical property characterisation study of the Ni-Fe-Cr alloys 718 and 945X. The aim of the project was to better understand the relationship between performance and microstructure of existing (Alloy 718) and newly developed (Alloy 945X) high strength nickel alloys focusing on downhole applications. The main difference between the two alloys is that alloy 945X has lower Nb content than alloy 718, which may minimise the tendency to form delta when combined with correct processing. Previous studies have related the hydrogen embrittl

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Devillard, Julie. "Lien entre microstructure et résistance à la compression du gypse moussé." Thesis, Lyon, 2020. http://www.theses.fr/2020LYSEI043.

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La présente étude porte sur la caractérisation microstructurale et mécanique du gypse moussé, matériau de cœur des plaques de plâtre allégées, présentant une forte porosité (75%) multi-échelle. L'objectif de ce travail est de déterminer l'influence de la microstructure du gypse moussé sur la dureté mesurée en indentation sphérique et d'analyser les mécanismes d'endommagement pour différentes microstructures. Des essais d’indentation sphérique ont été conduits sur des échantillons présentant des variations des différentes caractéristiques microstructurales du gypse moussé. Ces essais montrent q

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Clitheroe, Linda Suzanne. "The physical and microstructural properties of peened austenitic stainless steel." Thesis, University of Manchester, 2011. https://www.research.manchester.ac.uk/portal/en/theses/the-physical-and-microstructural-properties-of-peened-austenitic-stainless-steel(2576543d-5d47-4a41-9490-09eb1caf7204).html.

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Surface treatments used to improve the life of a material known as peening are already extensively used in industry. The main aim of peening is to introduce compressive resiudal stress to the surface and subsurface of a metallic material, however literature also includes a number of microstructural and mechanical effects that peening introduces to a material when the compressive residual stress is established. The aim of this dissertation is compare and contrast the mechanical and microstructural effects of a current industrial peening method called shot peening, with three new increasingly co

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Negroni, Matteo. "Studio e sviluppo di tecniche per la produzione di nanocompositi a matrice di alluminio." Master's thesis, Alma Mater Studiorum - Università di Bologna, 2013. http://amslaurea.unibo.it/4949/.

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Foundry aluminum alloys play a fundamental role in several industrial fields, as they are employed in the production of several components in a wide range of applications. Moreover, these alloys can be employed as matrix for the development of Metal Matrix Composites (MMC), whose reinforcing phases may have different composition, shape and dimension. Ceramic particle reinforced MMCs are particular interesting due to their isotropic properties and their high temperature resistance. For this kind of composites, usually, decreasing the size of the reinforcing phase leads to the increase of mechan

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Palmert, Frans. "Oxidation and degradation of nickel-base alloys at high temperatures." Thesis, KTH, Materials Science and Engineering, 2009. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-11986.

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<p>This master’s thesis work is a study of oxidation and degradation of nickel-base alloys at high temperatures. The materials studied are designed for use in critical gas turbine components such as turbine blades and vanes. Some of the alloys are used today, whereas others have not yet entered commercial application. In order to maximize the efficiency of gas turbines, there is an ambition to maximize the operating temperatures. There is therefore a demand for materials which can withstand the damage mechanisms active at high temperatures. Among these damage mechanisms are oxidation and micro

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Remešová, Michaela. "Výzkum a vývoj technologie přípravy tvrdé anodizace neželezných slitin." Doctoral thesis, Vysoké učení technické v Brně. CEITEC VUT, 2020. http://www.nusl.cz/ntk/nusl-433636.

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Práce je zaměřena na výzkum a vývoj technologie přípravy tvrdých anodických vrstev na třech různých typech neželezných materiálů a to (i) hliníkové slitině (AA1050), (ii) čistém hořčíku (99.9% Mg) a (iii) zinkové slitině (ZnTi2). Vhodnou kombinací anodizačních podmínek (napětí, proudová hustota, teplota a složení elektrolytu atd.) lze vytvářet anodické vrstvy s rozdílnými vlastnostmi. V rámci předložené práce byl prokázán vliv předúpravy a anodizačních podmínek na vzhled, morfologii, tloušťku a tvrdost vytvořených anodických vrstev. Pro zvýšení tribologických vlastností a tvrdosti byly anodick

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Каіймах, А. І. М. "Експериментальне дослідження мікроструктури та властивостей наноструктурних багатошарових покриттів на основі WN". Master's thesis, Сумський державний університет, 2021. https://essuir.sumdu.edu.ua/handle/123456789/87418.

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У дипломній роботі було досліджено процеси формування структури, складу, а також взаємозв’язок структурно-фазового стану і механічних та трибологічних властивостей ноноструктурних багатошарових покриттів на основі WN.

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Fonseca, Daniela Passarelo Moura da. "Processamento, microestrutura e propriedades de compósitos à base de cobre reforçados com alumina e céria." Universidade de São Paulo, 2018. http://www.teses.usp.br/teses/disponiveis/85/85134/tde-23112018-144937/.

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Compósitos de matriz metálica combinam diferentes classes de materiais a fim de obter novas propriedades, superiores às dos materiais originais. A adição de partículas cerâmicas (reforço) em ligas de cobre pode melhorar suas propriedades mecânicas sem gerar grande perda na condutividade elétrica. Este trabalho teve como objetivo processar e estudar a microestrutura e propriedades (condutividade elétrica, dureza e fratura) de compósitos à base de cobre reforçados com alumina e céria. As amostras foram processadas pela técnica de metalurgia do pó: pesagem, mistura (sem bolas por 30min a 46 rpm),

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Broussaud, Florence. "Influence de la teneur en magnesium sur la microstructure et les proprietes mecaniques d'alliages al-li-cu-mg." Paris 6, 1988. http://www.theses.fr/1988PA066110.

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Etude experimentale pour les alliages contenant 0 a 1% de magnesium. Analyse par microscopie electronique en transmission et par analyse enthalpique differentielle de l'evolution de la precipitation. Analyse de la correlation entre la precipitation et les proprietes mecaniques en utilisant des essais de durete et de traction. Seuls les alliages a faible teneur en magnesium s'averent interessants sur le plan d'une application. Influence de la structure (cristallisation et texture) sur les proprietes mecaniques et en particulier sur leur heterogeneite suivant la direction travers-long

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SANTOS, HAMILTA de O. "Caracterização de camisas de cilindro em ligas Al-Si hipereutéticas e investigação do comportamento de corrosão em meio de condensado sintético automotivo." reponame:Repositório Institucional do IPEN, 2006. http://repositorio.ipen.br:8080/xmlui/handle/123456789/11425.

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Made available in DSpace on 2014-10-09T12:51:46Z (GMT). No. of bitstreams: 0<br>Made available in DSpace on 2014-10-09T14:08:49Z (GMT). No. of bitstreams: 0<br>Tese (Doutoramento)<br>IPEN/T<br>Instituto de Pesquisas Energeticas e Nucleares - IPEN/CNEN-SP

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Trevisiol, Céline. "Effet de la microstructure et de la rugosité sur le comportement au frottement et à l’usure d’aciers faiblement alliés." Thesis, Compiègne, 2018. http://www.theses.fr/2018COMP2430.

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Cette thèse est un travail expérimental mettant en évidence les effets de la microstructure et de la rugosité sur le comportement au frottement et à l'usure d'aciers faiblement alliés. Une méthodologie est mise en place pour sélectionner des aciers faiblement alliés et générer des microstructures permettant de répondre à cet objectif. Différents échantillons caractérisés par une composition chimique, une microstructure et une macro-dureté sont générés et caractérisés tribologiquement par des essais de frottement. Une réflexion originale a été menée pour étudier le comportement tribologique d'u

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Weil, Hadrien. "Modélisation du besoin fonctionnel pour la nitruration gazeuse." Thesis, Paris, ENSAM, 2017. http://www.theses.fr/2017ENAM0037.

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La nitruration gazeuse est un traitement thermochimique permettant une meilleure résistance à la fatigue grâce à l’apport de propriétés mécaniques importantes telles que l’augmentation de la dureté et les contraintes résiduelles de compressions. Cette étude est réalisée sur un acier 33CrMoV12-9 utilisé dans l’industrie aéronautique. Un modèle complet adapté à cette nuance permet de quantifier les profils de contraintes résiduelles et de dureté en fonction des paramètres de nitruration. La prise en compte de l’apport de ces propriétés mécaniques est possible grâce à l’utilisation de critère de

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Tribe, Allan M. "Study on the Fracture Toughness of Friction Stir Welded API X80." BYU ScholarsArchive, 2012. https://scholarsarchive.byu.edu/etd/3740.

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High strength low alloy (HSLA) steels have been developed to simultaneously have high yield strength and high fracture toughness. However, in practical applications steel must be welded. Traditional arc welding has proven detrimental to the fracture toughness of HSLA steels. Friction stir welding has recently shown mixed results in welding HSLA steels. The range of welding parameters used in these recent studies however has been very limited. With only a few welding parameters tested, the effect of spindle speed, travel speed, and heat input on the fracture toughness of friction stir welded HS

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