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Dissertations / Theses on the topic 'Temperature of hardening'

Author: Grafiati

Published: 30 May 2022

Last updated: 31 July 2025

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1

Zangiabadi, Amirali. "Low-temperature interstitial hardening of 15-5 precipitation hardening martensitic stainless steel." Case Western Reserve University School of Graduate Studies / OhioLINK, 2016. http://rave.ohiolink.edu/etdc/view?acc_num=case1480769348244855.

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2

Mozgovoy, Sergej. "High Temperature Friction and Wear in Press Hardening." Licentiate thesis, Luleå tekniska universitet, Maskinelement, 2014. http://urn.kb.se/resolve?urn=urn:nbn:se:ltu:diva-26232.

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In the automotive industry, press hardening is usually employed to produce safety orstructural components from advanced high–strength steels. This hot forming process, andthermomechanical forming processes in general, is highly dependent on friction betweentool and workpiece as friction affects and controls the deformation of the workpiece.However, friction is also directly associated with wear of the forming tools. Tool wear isa complex system response depending on contact conditions and is a serious issue whenit comes to process economy as it reduces the service life of the tool. Therefore,

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3

Hwang, Kai-Lun H. "Physiological diversity and temperature hardening in adult tick dermacentor variabilis (ACARI: IXODIDAE)." The Ohio State University, 2006. http://rave.ohiolink.edu/etdc/view?acc_num=osu1149129871.

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4

PADIAL, ARMANDO G. F. "Caracterizacao microestrutural do aco maraging de grau 400 de resistencia mecanica ultra-elevada." reponame:Repositório Institucional do IPEN, 2002. http://repositorio.ipen.br:8080/xmlui/handle/123456789/10998.

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Made available in DSpace on 2014-10-09T12:46:42Z (GMT). No. of bitstreams: 0<br>Made available in DSpace on 2014-10-09T13:56:09Z (GMT). No. of bitstreams: 1 07613.pdf: 5555459 bytes, checksum: 0047c9f052248797761d648268e841ba (MD5)<br>Tese (Doutoramento)<br>IPEN/T<br>Instituto de Pesquisas Energeticas e Nucleares - IPEN/CNEN-SP

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5

Fan, Yangyang. "Precipitation Strengthening of Aluminum by Transition Metal Aluminides." Digital WPI, 2012. https://digitalcommons.wpi.edu/etd-theses/231.

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Aluminum-zirconium alloys exhibit superior strength at elevated temperature in comparison to traditional aluminum casting alloys. These alloys are heat-treatable and their strength depends to a large extent on the quenching and aging steps of the heat treatment process. However, measurements show that the critical cooling rate necessary to retain 0.6 wt. pct. zirconium(the minimum amount necessary for significant strengthening) in a super-saturated solid solution with aluminum is 90ºC/s, which is un-attainable with traditional casting processes. On the other hand, the critical cooling rate nec

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6

PRASAD, PRASHANTH. "CHARACTERIZATION OF NEW, CAST, HIGH TEMPERATURE ALUMINUM ALLOYS FOR DIESEL ENGINE APPLICATIONS." University of Cincinnati / OhioLINK, 2006. http://rave.ohiolink.edu/etdc/view?acc_num=ucin1148315194.

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7

Bílková, Lenka. "Nízkoteplotní a kryogenní zpracování cementačních součástí." Master's thesis, Vysoké učení technické v Brně. Fakulta strojního inženýrství, 2008. http://www.nusl.cz/ntk/nusl-228073.

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This work deals with the assessment of the influence of low-temperature treatment on the structure and properties of casehardened surface layer of parts. The objective was to assess whether low-temperature treatment is sufficient, insufficient, or unnecessary for the given purpose. Gears which form a part of Zetor tractors gear boxes were used as samples. Thirteen pairs of frozen and non-frozen samples were used; they were taken from production batches throughout 2007, their hardness was assessed and furthermore, the experiment itself, freezing casehardened and hardened samples to different te

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8

Ded, Gurdish S. "CHARACTERIZATION OF Ni-RICH NiTiHf BASED HIGH TEMPERATURE SHAPE MEMORY ALLOYS." UKnowledge, 2010. http://uknowledge.uky.edu/gradschool_theses/55.

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Among the potential high temperature shape memory alloys, due to its low cost, medium ductility and high work output NiTiHf seems to be the most promising HTSMA for a wide range of applications in the 100-250ºC. A detailed investigation into the shape memory properties and transformation behavior for the Ni-rich HTSMA with the compositions of Ni45.3Cu5Ti29.7Hf20, Ni50.3Ti29.7Hf20 and Ni45.3Pd5Ti29.7Hf20 was carried out. It is possible to form Ni-rich precipitates in Ni-rich NiTiHf alloys and tailor the TTs by heat treatments that results in increased strength and stable response at high temper

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9

Kazi-tani, Zakaria. "Simulation of Hardening of the MahanaKhon Tower Mat Foundation." Thesis, KTH, Betongbyggnad, 2019. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-244030.

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Cement hydration is the result of a series of simultaneous chemical reactions occurring during the production of concrete. An excessive amount of heat is generated, which consequently may give rise to thermal stresses and cause early age cracks in concrete that may affect its structural integrity, and load bearing capacity. Incorporating fly ash into the concrete mixture has shown to be an efficient method to reduce the temperatures developed during early age hydration, especially for massive concrete structures. Fly ash does additionally affect the concrete's development of compressive streng

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10

Mukarati, Tulani Wadzanai. "Constitutive modelling of the strain hardening behaviour of metastable AISI 301LN austenitic stainless steel as a function of strain and temperature." Diss., University of Pretoria, 2020. http://hdl.handle.net/2263/76008.

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The automotive industry currently demands materials with improved formability and crash performance. Austenitic stainless steels have been singled out for potential development of high strength steels to achieve exceptional combinations of strength and ductility due to their high strain hardening abilities. Austenitic 301LN stainless steel is the least alloyed and most metastable among the 300-series austenitic stainless steels. Plastic deformation at a temperature below Md transforms the metastable austenite phase to a thermodynamically more stable martensite phase accompanied with enhanced s

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11

Khodahami, Maryam. "Hydrogen uptake during Carburizing and Effusion of Hydrogen at Room Temperature and during Tempering." Thesis, KTH, Materialvetenskap, 2013. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-166776.

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The carburizing atmosphere during the case hardening process contains a large proportion of hydrogen. Due to the rapid diffusion of hydrogen a high amount of hydrogen can be absorbed by the carburizing component. The amount of absorbed hydrogen is dependent on some factors such as for example the carburizing time and component dimensions. Hydrogen diffused in material can then cause hydrogen embrittlement and in some cases cause cracking under a static load. This hydrogen must therefore be removed. High amounts of hydrogen diffuse out spontaneously at room temperature. Tempering accelerates th

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12

Larour, Patrick [Verfasser]. "Strain rate sensitivity of automotive sheet steels: influence of plastic strain, strain rate, temperature, microstructure, bake hardening and pre-strain / vorgelegt von Patrick Larour." Aachen : Shaker, 2010. http://d-nb.info/1007085649/34.

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13

Powell, Sarah Jayne. "Thermal acclimation processes in the grain aphid Sitobion avenae (Hemiptera: Aphididae) : characterising the effect of rapid cold hardening and seasonal acclimation on survival and movement thresholds at low temperature." Thesis, University of Birmingham, 2005. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.433744.

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14

Fredholm, Allan. "Monocristaux d'alliages base nickel : relation entre composition, microstructure et comportement en fluage a haute temperature." Paris, ENMP, 1987. http://www.theses.fr/1987ENMP0020.

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Analyse des phenomenes de coalescence orientee de la microstructure au cours du fluage dans differents superalliages a base de nickel durcis par precipitation de phase gamma '. Correlation entre la microstructure et la resistance au fluage. Determination, a partir de l'interpretation des resulats, un critere simple de resistance au fluage

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15

Мазаєва, Вікторія Сергіївна. "Технологія жирових продуктів із заданими властивостями багатоцільового призначення". Thesis, Український науково-дослідний інститут олій та жирів НААН, 2018. http://repository.kpi.kharkov.ua/handle/KhPI-Press/39134.

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Дисертація на здобуття наукового ступеня кандидата технічних наук за спеціальністю 05.18.06 – технологія жирів, ефірних масел і парфумерно-косметичних продуктів. – Національний технічний університет "Харківський політехнічний інститут", Харків, 2018. Дисертаційну роботу присвячено науковому обґрунтуванню перспективної технології одержання жирових продуктів з наперед заданими властивостями. Визначено триацилгліцерольний склад найбільш поширеної жирової сировини. Показано, що при загальній кількості триацилгліцеролів від 11 до 20 у кожному компоненті визначальними (за вмістом) є 7 – 10 триацил

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16

Мазаєва, Вікторія Сергіївна. "Технологія жирових продуктів із заданими властивостями багатоцільового призначення". Thesis, Національний технічний університет "Харківський політехнічний інститут", 2018. http://repository.kpi.kharkov.ua/handle/KhPI-Press/39133.

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Дисертація на здобуття наукового ступеня кандидата технічних наук за спеціальністю 05.18.06 – технологія жирів, ефірних масел і парфумерно-косметичних продуктів. – Національний технічний університет "Харківський політехнічний інститут", Харків, 2018. Дисертаційну роботу присвячено науковому обґрунтуванню перспективної технології одержання жирових продуктів з наперед заданими властивостями. Визначено триацилгліцерольний склад найбільш поширеної жирової сировини. Показано, що при загальній кількості триацилгліцеролів від 11 до 20 у кожному компоненті визначальними (за вмістом) є 7 – 10 триацилг

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17

Mørtsell, Eva Anne. "Dispersion hardening during annealing at low Temperatures in four 3xxx Al-Mn-Fe-Si Alloys." Thesis, Norges teknisk-naturvitenskapelige universitet, Institutt for fysikk, 2012. http://urn.kb.se/resolve?urn=urn:nbn:no:ntnu:diva-16808.

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3xxx aluminiumslegeringer har Mangan som hovedlegeringselement, og får sin styrke fra plastisk bearbeidelse. 3xxx legeringer har tidligere blitt ansett for å oppnå neglisjerbare endringer i hardhet og styrke som følge av presipitering av dispersoider.Denne masteroppgaven tar for seg hardhetsutvikling ved lave homogeniseringstemperaturer i fire 3xxx Al-Mn-Fe-Si legeringer som følge av presipitering av dispersoider. Legeringene ble homogenisert ved forskjellige temperaturer og holdetider. Utvikling av antallstetthet, gjennomsnittlig ekvivalent diameter og volumfraksjon a

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18

Edwards, Ylva. "Influence of waxes on bitumen and asphalt concrete mixture performance." Doctoral thesis, KTH, Väg- och banteknik, 2005. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-553.

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This doctoral thesis consists of a literature review, presented in two papers, and another six papers describing experimental studies of the influence of different kinds of wax and polyphosporic acid on bitumen and asphalt concrete mixture properties. The literature review should give an extensive description of the field of knowledge concerning wax in bitumen. Effects of wax in crude oil, bitumen and asphalt concrete as well as test methods for studying these effects are described. Theories behind possible mechanisms are also discussed, and commercial wax as additive to bitumen for different

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19

Ait, Saadi Bachir. "Configuration des dislocations dans l'acier z3 cnd 17-12 apres fatigue : correlation au comportement mecanique." Poitiers, 1988. http://www.theses.fr/1988POIT2259.

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Etude du comportement en fatigue plastique de l'acier inoxydable austenitique 316l fatigue sous vide a 20, 300 et 600c dans une gamme de deformations plastiques imposees. Analyse par microscopie electronique en transmission des sous-structures a20 et 600c, les microstructures sont constituees de bandes de glissement persistantes, de murs-canaux des labyrinthes et des structures en echelle evoluant vers la structure cellulaire. A300c, une structure de contraste en cotes de velours est observee. Cette structure est fonction de la deformation plastique et provoque un durcissement cyclique seconda

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20

Kawarasaki, Yuta. "SURVIVAL AND PHYSIOLOGICAL RESPONSES TO SUBZERO TEMPERATURES IN THE ANTARCTIC MIDGE, BELGICA ANTARCTICA: TO FREEZE OR NOT TO FREEZE." Miami University / OhioLINK, 2013. http://rave.ohiolink.edu/etdc/view?acc_num=miami1377681162.

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21

Beraldo, Camila Haga. "Efeito da temperatura de envelhecimento sobre as propriedades mecânicas e resistência à corrosão por pite do aço inoxidável martensítico endurecido por precipitação UNS S46500." Universidade de São Paulo, 2013. http://www.teses.usp.br/teses/disponiveis/3/3133/tde-15102014-163925/.

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Os aços inoxidáveis endurecidos por precipitação vêm sendo largamente empregados na indústria aeronáutica, por combinar resistência mecânica, tenacidade à fratura e resistência à corrosão. E deste modo, são materiais que possibilitam a substituição dos aços carbonos utilizados atualmente, que necessitam de tratamento superficial adicional, como o cádmio, para melhorar a resistência à corrosão. A utilização desses revestimentos traz desvantagens como o custo, a fabricação, a susceptibilidade à fragilização por hidrogênio além dos aspectos ambientais. Neste contexto, o aço endurecido por precipi

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22

Gomes, Tiago Evangelista. "Efeitos da temperatura de laminação na formação e na reversão de martensita induzida por deformação no aço inoxidável austenítico AISI 304L." Universidade de São Paulo, 2012. http://www.teses.usp.br/teses/disponiveis/3/3133/tde-19112012-125104/.

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Objetivo principal desta dissertação foi verificar os efeitos da temperatura de laminação na formação de martensita induzida por deformação e na sua posterior reversão da martensita para austenita no aço inoxidável austenítico AISI 304L. O estudo foi predominantemente microestrutural e para análise e caracterização foram utilizadas as técnicas de microscopia óptica, microscopia eletrônica de varredura, difração de raios X, medidas de dureza Vickers e medidas de fases ferromagnéticas por ferritoscopia. As amostras foram inicialmente solubilizadas a 1100 ºC por uma hora, visando a dissolução de

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23

Wilcox, Edward. "Silicon-germanium devices and circuits for cryogenic and high-radiation space environments." Thesis, Georgia Institute of Technology, 2010. http://hdl.handle.net/1853/33850.

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This work represents several years' research into the field of radiation hardening by design. The unique characteristics of a SiGe HBT, described in Chapter 1, make it ideally suitable for use in extreme environment applications. Chapter 2 describes the total ionizing dose effects experienced by a SiGe HBT, particularly those experienced on an Earth-orbital or lunar-surface mission. In addition, the effects of total dose are evaluated on passive devices. As opposed to the TID-hardness of SiGe transistors, a clear vulnerability to single-event effects does exist. This field is divided into

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24

Šmíd, Miroslav. "Stanovení zkrácených cyklických deformačních křivek superslitiny Inconel 738LC při zvýšených teplotách." Master's thesis, Vysoké učení technické v Brně. Fakulta strojního inženýrství, 2008. http://www.nusl.cz/ntk/nusl-228279.

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Multiple step tests under cyclic strain control have been performed using cylindrical specimens of cast polycrystalline Inconel 738LC superalloy at 23, 700, 500, 800 and 900 °C in laboratory atmosphere to obtain cyclic stress-strain curves. During cyclic straining of specimen were obtained cyclic hardening-softening curves. Their progress changed with temperature and strain amplitude. Evaluated cyclic stress-strain curves are shifted to lower stresses with increasing temperature. Surface relief was observed in fatigued specimens under SEM and metalography under optic microscopy. Slip markings

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25

Cardoso, Adilson Silva. "Design and characterization of BiCMOS mixed-signal circuits and devices for extreme environment applications." Diss., Georgia Institute of Technology, 2014. http://hdl.handle.net/1853/53099.

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State-of-the-art SiGe BiCMOS technologies leverage the maturity of deep-submicron silicon CMOS processing with bandgap-engineered SiGe HBTs in a single platform that is suitable for a wide variety of high performance and highly-integrated applications (e.g., system-on-chip (SOC), system-in-package (SiP)). Due to their bandgap-engineered base, SiGe HBTs are also naturally suited for cryogenic electronics and have the potential to replace the costly de facto technologies of choice (e.g., Gallium-Arsenide (GaAs) and Indium-Phosphide (InP)) in many cryogenic applications such as radio astronomy. T

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26

Liu, Chien-Chih, and 劉建志. "Low Temperature Precipitation Hardening and Characteristics of Die Cast 356 Aluminum Alloy." Thesis, 1999. http://ndltd.ncl.edu.tw/handle/57239553787959914674.

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碩士<br>大同工學院<br>材料工程研究所<br>87<br>This research aims to study the relationship of die cast aluminum alloy Grade 356 between microstructure and mechanism properties. Using 356 aluminum alloys, which is one of the aluminum-silicon-magnesium systems to produce specimens. During the casting process, the castings rapidly cooled to room temperature, and get finer microstructure than specimens made by sand-cast or gravity cast ones. Then in the aging precipitation hardening heat treatment, the Mg-Si compounds are precipitation and the geometry and distribution of Si will be provided. Die-cas

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27

Wen-shiung, Liu, and 劉文雄. "The Study of Antirust Coating of Single Fluid Normal-Temperature Hardening Epoxy Resin." Thesis, 2002. http://ndltd.ncl.edu.tw/handle/56358007103800354765.

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碩士<br>國立高雄師範大學<br>化學系<br>90<br>Abstract Epoxy resin based on bisphenol-A(NPEL-128) , due to its excellent characteristics, has been widely applied in industrial field. By curing with phosphoric acid (PHA) and diluting with solvents, such as methyl ethyl ketone , acetone, isoamyl acetate or ethyl acetate, it achieves a very good effect for de-rust and anti-rust. Also, if epoxy is diluted with ether, it is properly used as a good room temperature cured paint because the high volatility of ether effectively lowers the curing temperature. Studies, using FT-IR and DSC, help us to underst

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28

Muhl, Quintin Ernst. "Seed germination, tree growth and flowering responses of Moringa Oleifera lam. (horseradish tree) to temperature." Diss., 2010. http://hdl.handle.net/2263/28520.

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Moringa oleifera Lam. is a tree with great potential as it is fast growing and drought tolerant. Amongst the tree’s multitude of benefits, it can also be used to produce a biodiesel fuel. However, prior to the establishment of commercial plantations, all cultivation aspects of this promising tree have to be understood. Temperature is a significant climatic factor influencing both geographical plant distribution and growth, and since M. oleifera trees are naturally found in tropical climates around the world, the extent of their adaptability to cooler climates was the main objective of this stu

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29

Ghaffari, Tari Dariush. "Room and Elevated Temperature Constitutive Response of Polycrystalline Materials Exhibiting Tension-Compression Asymmetry under Monotonic Loading." Thesis, 2014. http://hdl.handle.net/10012/8432.

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A continuum plasticity yield function is developed that captures tension/compression asymmetry and its evolution as exhibited by HCP materials such as magnesium alloy sheet. The model, referred to herein as “CPB06ex3ev”, is based upon the CPB06 [1] yield surface which is extended in this research to consider evolution of asymmetry and anisotropy under monotonic loading. The model is further modified to incorporate thermal softening and strain rate effects. Mechanical characterization experiments are performed to acquire uniaxial tensile and compressive stress-strain data along a range of in-p

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30

Hassan, Ajoke Sherifat. "Effect of nano-carburization of mild steel on its surface hardness." Diss., 2015. http://hdl.handle.net/10500/20102.

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There has been progress in the surface modification of low carbon steel in order to enhance its surface hardness. This study contributes to this by investigating the introduction of carbon nanotubes and amorphous carbon in the carburization of mild steel. In order to achieve the goal, carbon nanotubes were synthesized in a horizontal tubular reactor placed in a furnace also called the chemical vapor deposition process at a temperature of 700oC. Catalyst was produced from Iron nitrate Fe(NO3)3.9H2O and Cobalt nitrate Co(NO3)2.6H2O on CaCO3 support while acetylene C2H2 was used as the carbon so

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